Merging upstream version 1.11.0+dfsg.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 9512 insertions, 0 deletions

diff --git a/web/gui/dashboard.js b/web/gui/dashboard.js
new file mode 100644
index 000000000..16fbf88d0
--- /dev/null
+++ b/web/gui/dashboard.js
@@ -0,0 +1,9512 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// ----------------------------------------------------------------------------
+// You can set the following variables before loading this script:
+
+/*global netdataNoDygraphs           *//* boolean,  disable dygraph charts
+ *                                                  (default: false) */
+/*global netdataNoSparklines         *//* boolean,  disable sparkline charts
+ *                                                  (default: false) */
+/*global netdataNoPeitys             *//* boolean,  disable peity charts
+ *                                                  (default: false) */
+/*global netdataNoGoogleCharts       *//* boolean,  disable google charts
+ *                                                  (default: false) */
+/*global netdataNoMorris             *//* boolean,  disable morris charts
+ *                                                  (default: false) */
+/*global netdataNoEasyPieChart       *//* boolean,  disable easypiechart charts
+ *                                                  (default: false) */
+/*global netdataNoGauge              *//* boolean,  disable gauge.js charts
+ *                                                  (default: false) */
+/*global netdataNoD3                 *//* boolean,  disable d3 charts
+ *                                                  (default: false) */
+/*global netdataNoC3                 *//* boolean,  disable c3 charts
+ *                                                  (default: false) */
+/*global netdataNoD3pie              *//* boolean,  disable d3pie charts
+ *                                                  (default: false) */
+/*global netdataNoBootstrap          *//* boolean,  disable bootstrap - disables help too
+ *                                                  (default: false) */
+/*global netdataNoFontAwesome        *//* boolean,  disable fontawesome (do not load it)
+ *                                                  (default: false) */
+/*global netdataIcons                *//* object,   overwrite netdata fontawesome icons
+ *                                                  (default: null) */
+/*global netdataDontStart            *//* boolean,  do not start the thread to process the charts
+ *                                                  (default: false) */
+/*global netdataErrorCallback        *//* function, callback to be called when the dashboard encounters an error
+ *                                                  (default: null) */
+/*global netdataRegistry:true        *//* boolean,  use the netdata registry
+ *                                                  (default: false) */
+/*global netdataNoRegistry           *//* boolean,  included only for compatibility with existing custom dashboard
+ *                                                  (obsolete - do not use this any more) */
+/*global netdataRegistryCallback     *//* function, callback that will be invoked with one param: the URLs from the registry
+ *                                                  (default: null) */
+/*global netdataShowHelp:true        *//* boolean,  disable charts help
+ *                                                  (default: true) */
+/*global netdataShowAlarms:true      *//* boolean,  enable alarms checks and notifications
+ *                                                  (default: false) */
+/*global netdataRegistryAfterMs:true *//* ms,       delay registry use at started
+ *                                                  (default: 1500) */
+/*global netdataCallback             *//* function, callback to be called when netdata is ready to start
+ *                                                  (default: null)
+ *                                                  netdata will be running while this is called
+ *                                                  (call NETDATA.pause to stop it) */
+/*global netdataPrepCallback         *//* function, callback to be called before netdata does anything else
+ *                                                  (default: null) */
+/*global netdataServer               *//* string,   the URL of the netdata server to use
+ *                                                  (default: the URL the page is hosted at) */
+/*global netdataServerStatic         *//* string,   the URL of the netdata server to use for static files
+ *                                                  (default: netdataServer) */
+/*global netdataSnapshotData         *//* object,   a netdata snapshot loaded
+ *                                                  (default: null) */
+/*global netdataAlarmsRecipients     *//* array,    an array of alarm recipients to show notifications for
+ *                                                  (default: null) */
+/*global netdataAlarmsRemember       *//* boolen,   keep our position in the alarm log at browser local storage
+ *                                                  (default: true) */
+/*global netdataAlarmsActiveCallback *//* function, a hook for the alarm logs
+ *                                                  (default: undefined) */
+/*global netdataAlarmsNotifCallback  *//* function, a hook for alarm notifications
+ *                                                  (default: undefined) */
+/*global netdataIntersectionObserver *//* boolean,  enable or disable the use of intersection observer
+ *                                                  (default: true) */
+/*global netdataCheckXSS             *//* boolean,  enable or disable checking for XSS issues
+ *                                                  (default: false) */
+
+// ----------------------------------------------------------------------------
+// global namespace
+
+var NETDATA = window.NETDATA || {};
+
+(function(window, document, $, undefined) {
+
+    NETDATA.encodeURIComponent = function(s) {
+        if(typeof(s) === 'string')
+            return encodeURIComponent(s);
+
+        return s;
+    };
+
+    // ------------------------------------------------------------------------
+    // compatibility fixes
+
+    // fix IE issue with console
+    if(!window.console) { window.console = { log: function(){} }; }
+
+    // if string.endsWith is not defined, define it
+    if(typeof String.prototype.endsWith !== 'function') {
+        String.prototype.endsWith = function(s) {
+            if(s.length > this.length) return false;
+            return this.slice(-s.length) === s;
+        };
+    }
+
+    // if string.startsWith is not defined, define it
+    if(typeof String.prototype.startsWith !== 'function') {
+        String.prototype.startsWith = function(s) {
+            if(s.length > this.length) return false;
+            return this.slice(s.length) === s;
+        };
+    }
+
+    NETDATA.name2id = function(s) {
+        return s
+            .replace(/ /g, '_')
+            .replace(/\(/g, '_')
+            .replace(/\)/g, '_')
+            .replace(/\./g, '_')
+            .replace(/\//g, '_');
+    };
+
+    // ----------------------------------------------------------------------------------------------------------------
+    // XSS checks
+
+    NETDATA.xss = {
+        enabled: (typeof netdataCheckXSS === 'undefined')?false:netdataCheckXSS,
+        enabled_for_data: (typeof netdataCheckXSS === 'undefined')?false:netdataCheckXSS,
+
+        string: function (s) {
+            return s.toString()
+                .replace(/</g, '&lt;')
+                .replace(/>/g, '&gt;')
+                .replace(/"/g, '&quot;')
+                .replace(/'/g, '&#39;');
+        },
+
+        object: function(name, obj, ignore_regex) {
+            if(typeof ignore_regex !== 'undefined' && ignore_regex.test(name) === true) {
+                // console.log('XSS: ignoring "' + name + '"');
+                return obj;
+            }
+
+            switch (typeof(obj)) {
+                case 'string':
+                    var ret = this.string(obj);
+                    if(ret !== obj) console.log('XSS protection changed string ' + name + ' from "' + obj + '" to "' + ret + '"');
+                    return ret;
+
+                case 'object':
+                    if(obj === null) return obj;
+
+                    if(Array.isArray(obj) === true) {
+                        // console.log('checking array "' + name + '"');
+
+                        var len = obj.length;
+                        while(len--)
+                            obj[len] = this.object(name + '[' + len + ']', obj[len], ignore_regex);
+                    }
+                    else {
+                        // console.log('checking object "' + name + '"');
+
+                        for(var i in obj) {
+                            if(obj.hasOwnProperty(i) === false) continue;
+                            if(this.string(i) !== i) {
+                                console.log('XSS protection removed invalid object member "' + name + '.' + i + '"');
+                                delete obj[i];
+                            }
+                            else
+                                obj[i] = this.object(name + '.' + i, obj[i], ignore_regex);
+                        }
+                    }
+                    return obj;
+
+                default:
+                    return obj;
+            }
+        },
+
+        checkOptional: function(name, obj, ignore_regex) {
+            if(this.enabled === true) {
+                //console.log('XSS: checking optional "' + name + '"...');
+                return this.object(name, obj, ignore_regex);
+            }
+            return obj;
+        },
+
+        checkAlways: function(name, obj, ignore_regex) {
+            //console.log('XSS: checking always "' + name + '"...');
+            return this.object(name, obj, ignore_regex);
+        },
+
+        checkData: function(name, obj, ignore_regex) {
+            if(this.enabled_for_data === true) {
+                //console.log('XSS: checking data "' + name + '"...');
+                return this.object(name, obj, ignore_regex);
+            }
+            return obj;
+        }
+    };
+
+    // ----------------------------------------------------------------------------------------------------------------
+    // Detect the netdata server
+
+    // http://stackoverflow.com/questions/984510/what-is-my-script-src-url
+    // http://stackoverflow.com/questions/6941533/get-protocol-domain-and-port-from-url
+    NETDATA._scriptSource = function() {
+        var script = null;
+
+        if(typeof document.currentScript !== 'undefined') {
+            script = document.currentScript;
+        }
+        else {
+            var all_scripts = document.getElementsByTagName('script');
+            script = all_scripts[all_scripts.length - 1];
+        }
+
+        if (typeof script.getAttribute.length !== 'undefined')
+            script = script.src;
+        else
+            script = script.getAttribute('src', -1);
+
+        return script;
+    };
+
+    if(typeof netdataServer !== 'undefined')
+        NETDATA.serverDefault = netdataServer;
+    else {
+        var s = NETDATA._scriptSource();
+        if(s) NETDATA.serverDefault = s.replace(/\/dashboard.js(\?.*)?$/g, "");
+        else {
+            console.log('WARNING: Cannot detect the URL of the netdata server.');
+            NETDATA.serverDefault = null;
+        }
+    }
+
+    if(NETDATA.serverDefault === null)
+        NETDATA.serverDefault = '';
+    else if(NETDATA.serverDefault.slice(-1) !== '/')
+        NETDATA.serverDefault += '/';
+
+    if(typeof netdataServerStatic !== 'undefined' && netdataServerStatic !== null && netdataServerStatic !== '') {
+        NETDATA.serverStatic = netdataServerStatic;
+        if(NETDATA.serverStatic.slice(-1) !== '/')
+            NETDATA.serverStatic += '/';
+    }
+    else {
+        NETDATA.serverStatic = NETDATA.serverDefault;
+    }
+
+
+    // default URLs for all the external files we need
+    // make them RELATIVE so that the whole thing can also be
+    // installed under a web server
+    NETDATA.jQuery              = NETDATA.serverStatic + 'lib/jquery-2.2.4.min.js';
+    NETDATA.peity_js            = NETDATA.serverStatic + 'lib/jquery.peity-3.2.0.min.js';
+    NETDATA.sparkline_js        = NETDATA.serverStatic + 'lib/jquery.sparkline-2.1.2.min.js';
+    NETDATA.easypiechart_js     = NETDATA.serverStatic + 'lib/jquery.easypiechart-97b5824.min.js';
+    NETDATA.gauge_js            = NETDATA.serverStatic + 'lib/gauge-1.3.2.min.js';
+    NETDATA.dygraph_js          = NETDATA.serverStatic + 'lib/dygraph-c91c859.min.js';
+    NETDATA.dygraph_smooth_js   = NETDATA.serverStatic + 'lib/dygraph-smooth-plotter-c91c859.js';
+    NETDATA.raphael_js          = NETDATA.serverStatic + 'lib/raphael-2.2.4-min.js';
+    NETDATA.c3_js               = NETDATA.serverStatic + 'lib/c3-0.4.18.min.js';
+    NETDATA.c3_css              = NETDATA.serverStatic + 'css/c3-0.4.18.min.css';
+    NETDATA.d3pie_js            = NETDATA.serverStatic + 'lib/d3pie-0.2.1-netdata-3.js';
+    NETDATA.d3_js               = NETDATA.serverStatic + 'lib/d3-4.12.2.min.js';
+    NETDATA.morris_js           = NETDATA.serverStatic + 'lib/morris-0.5.1.min.js';
+    NETDATA.morris_css          = NETDATA.serverStatic + 'css/morris-0.5.1.css';
+    NETDATA.google_js           = 'https://www.google.com/jsapi';
+
+    NETDATA.themes = {
+        white: {
+            bootstrap_css: NETDATA.serverStatic + 'css/bootstrap-3.3.7.css',
+            dashboard_css: NETDATA.serverStatic + 'dashboard.css?v20180210-1',
+            background: '#FFFFFF',
+            foreground: '#000000',
+            grid: '#F0F0F0',
+            axis: '#F0F0F0',
+            highlight: '#F5F5F5',
+            colors: [   '#3366CC', '#DC3912',   '#109618', '#FF9900',   '#990099', '#DD4477',
+                        '#3B3EAC', '#66AA00',   '#0099C6', '#B82E2E',   '#AAAA11', '#5574A6',
+                        '#994499', '#22AA99',   '#6633CC', '#E67300',   '#316395', '#8B0707',
+                        '#329262', '#3B3EAC' ],
+            easypiechart_track: '#f0f0f0',
+            easypiechart_scale: '#dfe0e0',
+            gauge_pointer: '#C0C0C0',
+            gauge_stroke: '#F0F0F0',
+            gauge_gradient: false,
+            d3pie: {
+                title: '#333333',
+                subtitle: '#666666',
+                footer: '#888888',
+                other: '#aaaaaa',
+                mainlabel: '#333333',
+                percentage: '#dddddd',
+                value: '#aaaa22',
+                tooltip_bg: '#000000',
+                tooltip_fg: '#efefef',
+                segment_stroke: "#ffffff",
+                gradient_color: '#000000'
+            }
+        },
+        slate: {
+            bootstrap_css: NETDATA.serverStatic + 'css/bootstrap-slate-flat-3.3.7.css?v20161229-1',
+            dashboard_css: NETDATA.serverStatic + 'dashboard.slate.css?v20180210-1',
+            background: '#272b30',
+            foreground: '#C8C8C8',
+            grid: '#283236',
+            axis: '#283236',
+            highlight: '#383838',
+/*          colors: [   '#55bb33', '#ff2222',   '#0099C6', '#faa11b',   '#adbce0', '#DDDD00',
+                        '#4178ba', '#f58122',   '#a5cc39', '#f58667',   '#f5ef89', '#cf93c0',
+                        '#a5d18a', '#b8539d',   '#3954a3', '#c8a9cf',   '#c7de8a', '#fad20a',
+                        '#a6a479', '#a66da8' ],
+*/
+            colors: [   '#66AA00', '#FE3912',   '#3366CC', '#D66300',   '#0099C6', '#DDDD00',
+                        '#5054e6', '#EE9911',   '#BB44CC', '#e45757',   '#ef0aef', '#CC7700',
+                        '#22AA99', '#109618',   '#905bfd', '#f54882',   '#4381bf', '#ff3737',
+                        '#329262', '#3B3EFF' ],
+            easypiechart_track: '#373b40',
+            easypiechart_scale: '#373b40',
+            gauge_pointer: '#474b50',
+            gauge_stroke: '#373b40',
+            gauge_gradient: false,
+            d3pie: {
+                title: '#C8C8C8',
+                subtitle: '#283236',
+                footer: '#283236',
+                other: '#283236',
+                mainlabel: '#C8C8C8',
+                percentage: '#dddddd',
+                value: '#cccc44',
+                tooltip_bg: '#272b30',
+                tooltip_fg: '#C8C8C8',
+                segment_stroke: "#283236",
+                gradient_color: '#000000'
+            }
+        }
+    };
+
+    if(typeof netdataTheme !== 'undefined' && typeof NETDATA.themes[netdataTheme] !== 'undefined')
+        NETDATA.themes.current = NETDATA.themes[netdataTheme];
+    else
+        NETDATA.themes.current = NETDATA.themes.white;
+
+    NETDATA.colors = NETDATA.themes.current.colors;
+
+    // these are the colors Google Charts are using
+    // we have them here to attempt emulate their look and feel on the other chart libraries
+    // http://there4.io/2012/05/02/google-chart-color-list/
+    //NETDATA.colors        = [ '#3366CC', '#DC3912', '#FF9900', '#109618', '#990099', '#3B3EAC', '#0099C6',
+    //                      '#DD4477', '#66AA00', '#B82E2E', '#316395', '#994499', '#22AA99', '#AAAA11',
+    //                      '#6633CC', '#E67300', '#8B0707', '#329262', '#5574A6', '#3B3EAC' ];
+
+    // an alternative set
+    // http://www.mulinblog.com/a-color-palette-optimized-for-data-visualization/
+    //                         (blue)     (red)      (orange)   (green)    (pink)     (brown)    (purple)   (yellow)   (gray)
+    //NETDATA.colors        = [ '#5DA5DA', '#F15854', '#FAA43A', '#60BD68', '#F17CB0', '#B2912F', '#B276B2', '#DECF3F', '#4D4D4D' ];
+
+    NETDATA.icons = {
+        left: '<i class="fas fa-backward"></i>',
+        reset: '<i class="fas fa-play"></i>',
+        right: '<i class="fas fa-forward"></i>',
+        zoomIn: '<i class="fas fa-plus"></i>',
+        zoomOut: '<i class="fas fa-minus"></i>',
+        resize: '<i class="fas fa-sort"></i>',
+        lineChart: '<i class="fas fa-chart-line"></i>',
+        areaChart: '<i class="fas fa-chart-area"></i>',
+        noChart: '<i class="fas fa-chart-area"></i>',
+        loading: '<i class="fas fa-sync-alt"></i>',
+        noData: '<i class="fas fa-exclamation-triangle"></i>'
+    };
+
+    if(typeof netdataIcons === 'object') {
+        for(var icon in NETDATA.icons) {
+            if(NETDATA.icons.hasOwnProperty(icon) && typeof(netdataIcons[icon]) === 'string')
+                NETDATA.icons[icon] = netdataIcons[icon];
+        }
+    }
+
+    if(typeof netdataSnapshotData === 'undefined')
+        netdataSnapshotData = null;
+
+    if(typeof netdataShowHelp === 'undefined')
+        netdataShowHelp = true;
+
+    if(typeof netdataShowAlarms === 'undefined')
+        netdataShowAlarms = false;
+
+    if(typeof netdataRegistryAfterMs !== 'number' || netdataRegistryAfterMs < 0)
+        netdataRegistryAfterMs = 1500;
+
+    if(typeof netdataRegistry === 'undefined') {
+        // backward compatibility
+        netdataRegistry = (typeof netdataNoRegistry !== 'undefined' && netdataNoRegistry === false);
+    }
+    if(netdataRegistry === false && typeof netdataRegistryCallback === 'function')
+        netdataRegistry = true;
+
+
+    // ----------------------------------------------------------------------------------------------------------------
+    // detect if this is probably a slow device
+
+    var isSlowDeviceResult = undefined;
+    var isSlowDevice = function() {
+        if(isSlowDeviceResult !== undefined)
+            return isSlowDeviceResult;
+
+        try {
+            var ua = navigator.userAgent.toLowerCase();
+
+            var iOS = /ipad|iphone|ipod/.test(ua) && !window.MSStream;
+            var android = /android/.test(ua) && !window.MSStream;
+            isSlowDeviceResult = (iOS === true || android === true);
+        }
+        catch (e) {
+            isSlowDeviceResult = false;
+        }
+
+        return isSlowDeviceResult;
+    };
+
+    // ----------------------------------------------------------------------------------------------------------------
+    // the defaults for all charts
+
+    // if the user does not specify any of these, the following will be used
+
+    NETDATA.chartDefaults = {
+        width: '100%',                  // the chart width - can be null
+        height: '100%',                 // the chart height - can be null
+        min_width: null,                // the chart minimum width - can be null
+        library: 'dygraph',             // the graphing library to use
+        method: 'average',              // the grouping method
+        before: 0,                      // panning
+        after: -600,                    // panning
+        pixels_per_point: 1,            // the detail of the chart
+        fill_luminance: 0.8             // luminance of colors in solid areas
+    };
+
+    // ----------------------------------------------------------------------------------------------------------------
+    // global options
+
+    NETDATA.options = {
+        pauseCallback: null,            // a callback when we are really paused
+
+        pause: false,                   // when enabled we don't auto-refresh the charts
+
+        targets: [],                    // an array of all the state objects that are
+                                        // currently active (independently of their
+                                        // viewport visibility)
+
+        updated_dom: true,              // when true, the DOM has been updated with
+                                        // new elements we have to check.
+
+        auto_refresher_fast_weight: 0,  // this is the current time in ms, spent
+                                        // rendering charts continuously.
+                                        // used with .current.fast_render_timeframe
+
+        page_is_visible: true,          // when true, this page is visible
+
+        auto_refresher_stop_until: 0,   // timestamp in ms - used internally, to stop the
+                                        // auto-refresher for some time (when a chart is
+                                        // performing pan or zoom, we need to stop refreshing
+                                        // all other charts, to have the maximum speed for
+                                        // rendering the chart that is panned or zoomed).
+                                        // Used with .current.global_pan_sync_time
+
+        on_scroll_refresher_stop_until: 0, // timestamp in ms - used to stop evaluating
+                                        // charts for some time, after a page scroll
+
+        last_page_resize: Date.now(),   // the timestamp of the last resize request
+
+        last_page_scroll: 0,            // the timestamp the last time the page was scrolled
+
+        browser_timezone: 'unknown',    // timezone detected by javascript
+        server_timezone: 'unknown',     // timezone reported by the server
+
+        force_data_points: 0,           // force the number of points to be returned for charts
+        fake_chart_rendering: false,    // when set to true, the dashboard will download data but will not render the charts
+
+        passive_events: null,           // true if the browser supports passive events
+
+        // the current profile
+        // we may have many...
+        current: {
+            units: 'auto',              // can be 'auto' or 'original'
+            temperature: 'celsius',     // can be 'celsius' or 'fahrenheit'
+            seconds_as_time: true,      // show seconds as DDd:HH:MM:SS ?
+            timezone: 'default',        // the timezone to use, or 'default'
+            user_set_server_timezone: 'default', // as set by the user on the dashboard
+
+            legend_toolbox: true,       // show the legend toolbox on charts
+            resize_charts: true,        // show the resize handler on charts
+
+            pixels_per_point: isSlowDevice()?5:1, // the minimum pixels per point for all charts
+                                        // increase this to speed javascript up
+                                        // each chart library has its own limit too
+                                        // the max of this and the chart library is used
+                                        // the final is calculated every time, so a change
+                                        // here will have immediate effect on the next chart
+                                        // update
+
+            idle_between_charts: 100,   // ms - how much time to wait between chart updates
+
+            fast_render_timeframe: 200, // ms - render continuously until this time of continuous
+                                        // rendering has been reached
+                                        // this setting is used to make it render e.g. 10
+                                        // charts at once, sleep idle_between_charts time
+                                        // and continue for another 10 charts.
+
+            idle_between_loops: 500,    // ms - if all charts have been updated, wait this
+                                        // time before starting again.
+
+            idle_parallel_loops: 100,   // ms - the time between parallel refresher updates
+
+            idle_lost_focus: 500,       // ms - when the window does not have focus, check
+                                        // if focus has been regained, every this time
+
+            global_pan_sync_time: 300,  // ms - when you pan or zoom a chart, the background
+                                        // auto-refreshing of charts is paused for this amount
+                                        // of time
+
+            sync_selection_delay: 400,  // ms - when you pan or zoom a chart, wait this amount
+                                        // of time before setting up synchronized selections
+                                        // on hover.
+
+            sync_selection: true,       // enable or disable selection sync
+
+            pan_and_zoom_delay: 50,     // when panning or zooming, how ofter to update the chart
+
+            sync_pan_and_zoom: true,    // enable or disable pan and zoom sync
+
+            pan_and_zoom_data_padding: true, // fetch more data for the master chart when panning or zooming
+
+            update_only_visible: true,  // enable or disable visibility management / used for printing
+
+            parallel_refresher: (isSlowDevice() === false), // enable parallel refresh of charts
+
+            concurrent_refreshes: true, // when parallel_refresher is enabled, sync also the charts
+
+            destroy_on_hide: (isSlowDevice() === true), // destroy charts when they are not visible
+
+            show_help: netdataShowHelp, // when enabled the charts will show some help
+            show_help_delay_show_ms: 500,
+            show_help_delay_hide_ms: 0,
+
+            eliminate_zero_dimensions: true, // do not show dimensions with just zeros
+
+            stop_updates_when_focus_is_lost: true, // boolean - shall we stop auto-refreshes when document does not have user focus
+            stop_updates_while_resizing: 1000,  // ms - time to stop auto-refreshes while resizing the charts
+
+            double_click_speed: 500,    // ms - time between clicks / taps to detect double click/tap
+
+            smooth_plot: (isSlowDevice() === false), // enable smooth plot, where possible
+
+            color_fill_opacity_line: 1.0,
+            color_fill_opacity_area: 0.2,
+            color_fill_opacity_stacked: 0.8,
+
+            pan_and_zoom_factor: 0.25,      // the increment when panning and zooming with the toolbox
+            pan_and_zoom_factor_multiplier_control: 2.0,
+            pan_and_zoom_factor_multiplier_shift: 3.0,
+            pan_and_zoom_factor_multiplier_alt: 4.0,
+
+            abort_ajax_on_scroll: false,            // kill pending ajax page scroll
+            async_on_scroll: false,                 // sync/async onscroll handler
+            onscroll_worker_duration_threshold: 30, // time in ms, for async scroll handler
+
+            retries_on_data_failures: 3, // how many retries to make if we can't fetch chart data from the server
+
+            setOptionCallback: function() { }
+        },
+
+        debug: {
+            show_boxes:         false,
+            main_loop:          false,
+            focus:              false,
+            visibility:         false,
+            chart_data_url:     false,
+            chart_errors:       false, // remember to set it to false before merging
+            chart_timing:       false,
+            chart_calls:        false,
+            libraries:          false,
+            dygraph:            false,
+            globalSelectionSync:false,
+            globalPanAndZoom:   false
+        }
+    };
+
+    NETDATA.statistics = {
+        refreshes_total: 0,
+        refreshes_active: 0,
+        refreshes_active_max: 0
+    };
+
+
+    // ----------------------------------------------------------------------------------------------------------------
+
+    NETDATA.timeout = {
+        // by default, these are just wrappers to setTimeout() / clearTimeout()
+
+        step: function(callback) {
+            return window.setTimeout(callback, 1000 / 60);
+        },
+
+        set: function(callback, delay) {
+            return window.setTimeout(callback, delay);
+        },
+
+        clear: function(id) {
+            return window.clearTimeout(id);
+        },
+
+        init: function() {
+            var custom = true;
+
+            if(window.requestAnimationFrame) {
+                this.step = function(callback) {
+                    return window.requestAnimationFrame(callback);
+                };
+
+                this.clear = function(handle) {
+                    return window.cancelAnimationFrame(handle.value);
+                };
+            }
+            else if(window.webkitRequestAnimationFrame) {
+                this.step = function(callback) {
+                    return window.webkitRequestAnimationFrame(callback);
+                };
+
+                if(window.webkitCancelAnimationFrame) {
+                    this.clear = function (handle) {
+                        return window.webkitCancelAnimationFrame(handle.value);
+                    };
+                }
+                else if(window.webkitCancelRequestAnimationFrame) {
+                    this.clear = function (handle) {
+                        return window.webkitCancelRequestAnimationFrame(handle.value);
+                    };
+                }
+            }
+            else if(window.mozRequestAnimationFrame) {
+                this.step = function(callback) {
+                    return window.mozRequestAnimationFrame(callback);
+                };
+
+                this.clear = function(handle) {
+                    return window.mozCancelRequestAnimationFrame(handle.value);
+                };
+            }
+            else if(window.oRequestAnimationFrame) {
+                this.step = function(callback) {
+                    return window.oRequestAnimationFrame(callback);
+                };
+
+                this.clear = function(handle) {
+                    return window.oCancelRequestAnimationFrame(handle.value);
+                };
+            }
+            else if(window.msRequestAnimationFrame) {
+                this.step = function(callback) {
+                    return window.msRequestAnimationFrame(callback);
+                };
+
+                this.clear = function(handle) {
+                    return window.msCancelRequestAnimationFrame(handle.value);
+                };
+            }
+            else
+                custom = false;
+
+
+            if(custom === true) {
+                // we have installed custom .step() / .clear() functions
+                // overwrite the .set() too
+
+                this.set = function(callback, delay) {
+                    var that = this;
+
+                    var start = Date.now(),
+                        handle = new Object();
+
+                    function loop() {
+                        var current = Date.now(),
+                            delta = current - start;
+
+                        if(delta >= delay) {
+                            callback.call();
+                        }
+                        else {
+                            handle.value = that.step(loop);
+                        }
+                    }
+
+                    handle.value = that.step(loop);
+                    return handle;
+                };
+            }
+        }
+    };
+
+    NETDATA.timeout.init();
+
+
+    // ----------------------------------------------------------------------------------------------------------------
+    // local storage options
+
+    NETDATA.localStorage = {
+        default: {},
+        current: {},
+        callback: {} // only used for resetting back to defaults
+    };
+
+    NETDATA.localStorageTested = -1;
+    NETDATA.localStorageTest = function() {
+        if(NETDATA.localStorageTested !== -1)
+            return NETDATA.localStorageTested;
+
+        if(typeof Storage !== "undefined" && typeof localStorage === 'object') {
+            var test = 'test';
+            try {
+                localStorage.setItem(test, test);
+                localStorage.removeItem(test);
+                NETDATA.localStorageTested = true;
+            }
+            catch (e) {
+                NETDATA.localStorageTested = false;
+            }
+        }
+        else
+            NETDATA.localStorageTested = false;
+
+        return NETDATA.localStorageTested;
+    };
+
+    NETDATA.localStorageGet = function(key, def, callback) {
+        var ret = def;
+
+        if(typeof NETDATA.localStorage.default[key.toString()] === 'undefined') {
+            NETDATA.localStorage.default[key.toString()] = def;
+            NETDATA.localStorage.callback[key.toString()] = callback;
+        }
+
+        if(NETDATA.localStorageTest() === true) {
+            try {
+                // console.log('localStorage: loading "' + key.toString() + '"');
+                ret = localStorage.getItem(key.toString());
+                // console.log('netdata loaded: ' + key.toString() + ' = ' + ret.toString());
+                if(ret === null || ret === 'undefined') {
+                    // console.log('localStorage: cannot load it, saving "' + key.toString() + '" with value "' + JSON.stringify(def) + '"');
+                    localStorage.setItem(key.toString(), JSON.stringify(def));
+                    ret = def;
+                }
+                else {
+                    // console.log('localStorage: got "' + key.toString() + '" with value "' + ret + '"');
+                    ret = JSON.parse(ret);
+                    // console.log('localStorage: loaded "' + key.toString() + '" as value ' + ret + ' of type ' + typeof(ret));
+                }
+            }
+            catch(error) {
+                console.log('localStorage: failed to read "' + key.toString() + '", using default: "' + def.toString() + '"');
+                ret = def;
+            }
+        }
+
+        if(typeof ret === 'undefined' || ret === 'undefined') {
+            console.log('localStorage: LOADED UNDEFINED "' + key.toString() + '" as value ' + ret + ' of type ' + typeof(ret));
+            ret = def;
+        }
+
+        NETDATA.localStorage.current[key.toString()] = ret;
+        return ret;
+    };
+
+    NETDATA.localStorageSet = function(key, value, callback) {
+        if(typeof value === 'undefined' || value === 'undefined') {
+            console.log('localStorage: ATTEMPT TO SET UNDEFINED "' + key.toString() + '" as value ' + value + ' of type ' + typeof(value));
+        }
+
+        if(typeof NETDATA.localStorage.default[key.toString()] === 'undefined') {
+            NETDATA.localStorage.default[key.toString()] = value;
+            NETDATA.localStorage.current[key.toString()] = value;
+            NETDATA.localStorage.callback[key.toString()] = callback;
+        }
+
+        if(NETDATA.localStorageTest() === true) {
+            // console.log('localStorage: saving "' + key.toString() + '" with value "' + JSON.stringify(value) + '"');
+            try {
+                localStorage.setItem(key.toString(), JSON.stringify(value));
+            }
+            catch(e) {
+                console.log('localStorage: failed to save "' + key.toString() + '" with value: "' + value.toString() + '"');
+            }
+        }
+
+        NETDATA.localStorage.current[key.toString()] = value;
+        return value;
+    };
+
+    NETDATA.localStorageGetRecursive = function(obj, prefix, callback) {
+        var keys = Object.keys(obj);
+        var len = keys.length;
+        while(len--) {
+            var i = keys[len];
+
+            if(typeof obj[i] === 'object') {
+                //console.log('object ' + prefix + '.' + i.toString());
+                NETDATA.localStorageGetRecursive(obj[i], prefix + '.' + i.toString(), callback);
+                continue;
+            }
+
+            obj[i] = NETDATA.localStorageGet(prefix + '.' + i.toString(), obj[i], callback);
+        }
+    };
+
+    NETDATA.setOption = function(key, value) {
+        if(key.toString() === 'setOptionCallback') {
+            if(typeof NETDATA.options.current.setOptionCallback === 'function') {
+                NETDATA.options.current[key.toString()] = value;
+                NETDATA.options.current.setOptionCallback();
+            }
+        }
+        else if(NETDATA.options.current[key.toString()] !== value) {
+            var name = 'options.' + key.toString();
+
+            if(typeof NETDATA.localStorage.default[name.toString()] === 'undefined')
+                console.log('localStorage: setOption() on unsaved option: "' + name.toString() + '", value: ' + value);
+
+            //console.log(NETDATA.localStorage);
+            //console.log('setOption: setting "' + key.toString() + '" to "' + value + '" of type ' + typeof(value) + ' original type ' + typeof(NETDATA.options.current[key.toString()]));
+            //console.log(NETDATA.options);
+            NETDATA.options.current[key.toString()] = NETDATA.localStorageSet(name.toString(), value, null);
+
+            if(typeof NETDATA.options.current.setOptionCallback === 'function')
+                NETDATA.options.current.setOptionCallback();
+        }
+
+        return true;
+    };
+
+    NETDATA.getOption = function(key) {
+        return NETDATA.options.current[key.toString()];
+    };
+
+    // read settings from local storage
+    NETDATA.localStorageGetRecursive(NETDATA.options.current, 'options', null);
+
+    // always start with this option enabled.
+    NETDATA.setOption('stop_updates_when_focus_is_lost', true);
+
+    NETDATA.resetOptions = function() {
+        var keys = Object.keys(NETDATA.localStorage.default);
+        var len = keys.length;
+        while(len--) {
+            var i = keys[len];
+            var a = i.split('.');
+
+            if(a[0] === 'options') {
+                if(a[1] === 'setOptionCallback') continue;
+                if(typeof NETDATA.localStorage.default[i] === 'undefined') continue;
+                if(NETDATA.options.current[i] === NETDATA.localStorage.default[i]) continue;
+
+                NETDATA.setOption(a[1], NETDATA.localStorage.default[i]);
+            }
+            else if(a[0] === 'chart_heights') {
+                if(typeof NETDATA.localStorage.callback[i] === 'function' && typeof NETDATA.localStorage.default[i] !== 'undefined') {
+                    NETDATA.localStorage.callback[i](NETDATA.localStorage.default[i]);
+                }
+            }
+        }
+
+        NETDATA.dateTime.init(NETDATA.options.current.timezone);
+    };
+
+    // ----------------------------------------------------------------------------------------------------------------
+
+    if(NETDATA.options.debug.main_loop === true)
+        console.log('welcome to NETDATA');
+
+    NETDATA.onresizeCallback = null;
+    NETDATA.onresize = function() {
+        NETDATA.options.last_page_resize = Date.now();
+        NETDATA.onscroll();
+
+        if(typeof NETDATA.onresizeCallback === 'function')
+            NETDATA.onresizeCallback();
+    };
+
+    NETDATA.abort_all_refreshes = function() {
+        var targets = NETDATA.options.targets;
+        var len = targets.length;
+
+        while (len--) {
+            if (targets[len].fetching_data === true) {
+                if (typeof targets[len].xhr !== 'undefined') {
+                    targets[len].xhr.abort();
+                    targets[len].running = false;
+                    targets[len].fetching_data = false;
+                }
+            }
+        }
+    };
+
+    NETDATA.onscroll_start_delay = function() {
+        NETDATA.options.last_page_scroll = Date.now();
+
+        NETDATA.options.on_scroll_refresher_stop_until =
+            NETDATA.options.last_page_scroll
+            + ((NETDATA.options.current.async_on_scroll === true) ? 1000 : 0);
+    };
+
+    NETDATA.onscroll_end_delay = function() {
+        NETDATA.options.on_scroll_refresher_stop_until =
+            Date.now()
+            + ((NETDATA.options.current.async_on_scroll === true) ? NETDATA.options.current.onscroll_worker_duration_threshold : 0);
+    };
+
+    NETDATA.onscroll_updater_timeout_id = undefined;
+    NETDATA.onscroll_updater = function() {
+        NETDATA.globalSelectionSync.stop();
+
+        if(NETDATA.options.abort_ajax_on_scroll === true)
+            NETDATA.abort_all_refreshes();
+
+        // when the user scrolls he sees that we have
+        // hidden all the not-visible charts
+        // using this little function we try to switch
+        // the charts back to visible quickly
+
+        if(NETDATA.intersectionObserver.enabled() === false) {
+            if (NETDATA.options.current.parallel_refresher === false) {
+                var targets = NETDATA.options.targets;
+                var len = targets.length;
+
+                while (len--)
+                    if (targets[len].running === false)
+                        targets[len].isVisible();
+            }
+        }
+
+        NETDATA.onscroll_end_delay();
+    };
+
+    NETDATA.scrollUp = false;
+    NETDATA.scrollY = window.scrollY;
+    NETDATA.onscroll = function() {
+        //console.log('onscroll() begin');
+
+        NETDATA.onscroll_start_delay();
+        NETDATA.chartRefresherReschedule();
+
+        NETDATA.scrollUp = (window.scrollY > NETDATA.scrollY);
+        NETDATA.scrollY = window.scrollY;
+
+        if(NETDATA.onscroll_updater_timeout_id)
+            NETDATA.timeout.clear(NETDATA.onscroll_updater_timeout_id);
+
+        NETDATA.onscroll_updater_timeout_id = NETDATA.timeout.set(NETDATA.onscroll_updater, 0);
+        //console.log('onscroll() end');
+    };
+
+    NETDATA.supportsPassiveEvents = function() {
+        if(NETDATA.options.passive_events === null) {
+            var supportsPassive = false;
+            try {
+                var opts = Object.defineProperty({}, 'passive', {
+                    get: function () {
+                        supportsPassive = true;
+                    }
+                });
+                window.addEventListener("test", null, opts);
+            } catch (e) {
+                console.log('browser does not support passive events');
+            }
+
+            NETDATA.options.passive_events = supportsPassive;
+        }
+
+        // console.log('passive ' + NETDATA.options.passive_events);
+        return NETDATA.options.passive_events;
+    };
+
+    window.addEventListener('resize', NETDATA.onresize, NETDATA.supportsPassiveEvents() ? { passive: true } : false);
+    window.addEventListener('scroll', NETDATA.onscroll, NETDATA.supportsPassiveEvents() ? { passive: true } : false);
+    // window.onresize = NETDATA.onresize;
+    // window.onscroll = NETDATA.onscroll;
+
+    // ----------------------------------------------------------------------------------------------------------------
+    // Error Handling
+
+    NETDATA.errorCodes = {
+        100: { message: "Cannot load chart library", alert: true },
+        101: { message: "Cannot load jQuery", alert: true },
+        402: { message: "Chart library not found", alert: false },
+        403: { message: "Chart library not enabled/is failed", alert: false },
+        404: { message: "Chart not found", alert: false },
+        405: { message: "Cannot download charts index from server", alert: true },
+        406: { message: "Invalid charts index downloaded from server", alert: true },
+        407: { message: "Cannot HELLO netdata server", alert: false },
+        408: { message: "Netdata servers sent invalid response to HELLO", alert: false },
+        409: { message: "Cannot ACCESS netdata registry", alert: false },
+        410: { message: "Netdata registry ACCESS failed", alert: false },
+        411: { message: "Netdata registry server send invalid response to DELETE ", alert: false },
+        412: { message: "Netdata registry DELETE failed", alert: false },
+        413: { message: "Netdata registry server send invalid response to SWITCH ", alert: false },
+        414: { message: "Netdata registry SWITCH failed", alert: false },
+        415: { message: "Netdata alarms download failed", alert: false },
+        416: { message: "Netdata alarms log download failed", alert: false },
+        417: { message: "Netdata registry server send invalid response to SEARCH ", alert: false },
+        418: { message: "Netdata registry SEARCH failed", alert: false }
+    };
+    NETDATA.errorLast = {
+        code: 0,
+        message: "",
+        datetime: 0
+    };
+
+    NETDATA.error = function(code, msg) {
+        NETDATA.errorLast.code = code;
+        NETDATA.errorLast.message = msg;
+        NETDATA.errorLast.datetime = Date.now();
+
+        console.log("ERROR " + code + ": " + NETDATA.errorCodes[code].message + ": " + msg);
+
+        var ret = true;
+        if(typeof netdataErrorCallback === 'function') {
+           ret = netdataErrorCallback('system', code, msg);
+        }
+
+        if(ret && NETDATA.errorCodes[code].alert)
+            alert("ERROR " + code + ": " + NETDATA.errorCodes[code].message + ": " + msg);
+    };
+
+    NETDATA.errorReset = function() {
+        NETDATA.errorLast.code = 0;
+        NETDATA.errorLast.message = "You are doing fine!";
+        NETDATA.errorLast.datetime = 0;
+    };
+
+    // ----------------------------------------------------------------------------------------------------------------
+    // fast numbers formatting
+
+    NETDATA.fastNumberFormat = {
+        formatters_fixed: [],
+        formatters_zero_based: [],
+
+        // this is the fastest and the preferred
+        getIntlNumberFormat: function(min, max) {
+            var key = max;
+            if(min === max) {
+                if(typeof this.formatters_fixed[key] === 'undefined')
+                    this.formatters_fixed[key] = new Intl.NumberFormat(undefined, {
+                        // style: 'decimal',
+                        // minimumIntegerDigits: 1,
+                        // minimumSignificantDigits: 1,
+                        // maximumSignificantDigits: 1,
+                        useGrouping: true,
+                        minimumFractionDigits: min,
+                        maximumFractionDigits: max
+                    });
+
+                return this.formatters_fixed[key];
+            }
+            else if(min === 0) {
+                if(typeof this.formatters_zero_based[key] === 'undefined')
+                    this.formatters_zero_based[key] = new Intl.NumberFormat(undefined, {
+                        // style: 'decimal',
+                        // minimumIntegerDigits: 1,
+                        // minimumSignificantDigits: 1,
+                        // maximumSignificantDigits: 1,
+                        useGrouping: true,
+                        minimumFractionDigits: min,
+                        maximumFractionDigits: max
+                    });
+
+                return this.formatters_zero_based[key];
+            }
+            else {
+                // this is never used
+                // it is added just for completeness
+                return new Intl.NumberFormat(undefined, {
+                    // style: 'decimal',
+                    // minimumIntegerDigits: 1,
+                    // minimumSignificantDigits: 1,
+                    // maximumSignificantDigits: 1,
+                    useGrouping: true,
+                    minimumFractionDigits: min,
+                    maximumFractionDigits: max
+                });
+            }
+        },
+
+        // this respects locale
+        getLocaleString: function(min, max) {
+            var key = max;
+            if(min === max) {
+                if(typeof this.formatters_fixed[key] === 'undefined')
+                    this.formatters_fixed[key] = {
+                        format: function (value) {
+                            return value.toLocaleString(undefined, {
+                                // style: 'decimal',
+                                // minimumIntegerDigits: 1,
+                                // minimumSignificantDigits: 1,
+                                // maximumSignificantDigits: 1,
+                                useGrouping: true,
+                                minimumFractionDigits: min,
+                                maximumFractionDigits: max
+                            });
+                        }
+                    };
+
+                return this.formatters_fixed[key];
+            }
+            else if(min === 0) {
+                if(typeof this.formatters_zero_based[key] === 'undefined')
+                    this.formatters_zero_based[key] = {
+                        format: function (value) {
+                            return value.toLocaleString(undefined, {
+                                // style: 'decimal',
+                                // minimumIntegerDigits: 1,
+                                // minimumSignificantDigits: 1,
+                                // maximumSignificantDigits: 1,
+                                useGrouping: true,
+                                minimumFractionDigits: min,
+                                maximumFractionDigits: max
+                            });
+                        }
+                    };
+
+                return this.formatters_zero_based[key];
+            }
+            else {
+                return {
+                    format: function (value) {
+                        return value.toLocaleString(undefined, {
+                            // style: 'decimal',
+                            // minimumIntegerDigits: 1,
+                            // minimumSignificantDigits: 1,
+                            // maximumSignificantDigits: 1,
+                            useGrouping: true,
+                            minimumFractionDigits: min,
+                            maximumFractionDigits: max
+                        });
+                    }
+                };
+            }
+        },
+
+        // the fallback
+        getFixed: function(min, max) {
+            var key = max;
+            if(min === max) {
+                if(typeof this.formatters_fixed[key] === 'undefined')
+                    this.formatters_fixed[key] = {
+                        format: function (value) {
+                            if(value === 0) return "0";
+                            return value.toFixed(max);
+                        }
+                    };
+
+                return this.formatters_fixed[key];
+            }
+            else if(min === 0) {
+                if(typeof this.formatters_zero_based[key] === 'undefined')
+                    this.formatters_zero_based[key] = {
+                        format: function (value) {
+                            if(value === 0) return "0";
+                            return value.toFixed(max);
+                        }
+                    };
+
+                return this.formatters_zero_based[key];
+            }
+            else {
+                return {
+                    format: function (value) {
+                        if(value === 0) return "0";
+                        return value.toFixed(max);
+                    }
+                };
+            }
+        },
+
+        testIntlNumberFormat: function() {
+            var value = 1.12345;
+            var e1 = "1.12", e2 = "1,12";
+            var s = "";
+
+            try {
+                var x = new Intl.NumberFormat(undefined, {
+                    useGrouping: true,
+                    minimumFractionDigits: 2,
+                    maximumFractionDigits: 2
+                });
+
+                s = x.format(value);
+            }
+            catch(e) {
+                s = "";
+            }
+
+            // console.log('NumberFormat: ', s);
+            return (s === e1 || s === e2);
+        },
+
+        testLocaleString: function() {
+            var value = 1.12345;
+            var e1 = "1.12", e2 = "1,12";
+            var s = "";
+
+            try {
+                s = value.toLocaleString(undefined, {
+                    useGrouping: true,
+                    minimumFractionDigits: 2,
+                    maximumFractionDigits: 2
+                });
+            }
+            catch(e) {
+                s = "";
+            }
+
+            // console.log('localeString: ', s);
+            return (s === e1 || s === e2);
+        },
+
+        // on first run we decide which formatter to use
+        get: function(min, max) {
+            if(this.testIntlNumberFormat()) {
+                // console.log('numberformat');
+                this.get = this.getIntlNumberFormat;
+            }
+            else if(this.testLocaleString()) {
+                // console.log('localestring');
+                this.get = this.getLocaleString;
+            }
+            else {
+                // console.log('fixed');
+                this.get = this.getFixed;
+            }
+            return this.get(min, max);
+        }
+    };
+
+    // ----------------------------------------------------------------------------------------------------------------
+    // element data attributes
+
+    NETDATA.dataAttribute = function(element, attribute, def) {
+        var key = 'data-' + attribute.toString();
+        if(element.hasAttribute(key) === true) {
+            var data = element.getAttribute(key);
+
+            if(data === 'true') return true;
+            if(data === 'false') return false;
+            if(data === 'null') return null;
+
+            // Only convert to a number if it doesn't change the string
+            if(data === +data + '') return +data;
+
+            if(/^(?:\{[\w\W]*\}|\[[\w\W]*\])$/.test(data))
+                return JSON.parse(data);
+
+            return data;
+        }
+        else return def;
+    };
+
+    NETDATA.dataAttributeBoolean = function(element, attribute, def) {
+        var value = NETDATA.dataAttribute(element, attribute, def);
+
+        if(value === true || value === false)
+            return value;
+
+        if(typeof(value) === 'string') {
+            if(value === 'yes' || value === 'on')
+                return true;
+
+            if(value === '' || value === 'no' || value === 'off' || value === 'null')
+                return false;
+
+            return def;
+        }
+
+        if(typeof(value) === 'number')
+            return value !== 0;
+
+        return def;
+    };
+
+    // ----------------------------------------------------------------------------------------------------------------
+    // commonMin & commonMax
+
+    NETDATA.commonMin = {
+        keys: {},
+        latest: {},
+
+        globalReset: function() {
+            this.keys = {};
+            this.latest = {};
+        },
+
+        get: function(state) {
+            if(typeof state.tmp.__commonMin === 'undefined') {
+                // get the commonMin setting
+                state.tmp.__commonMin = NETDATA.dataAttribute(state.element, 'common-min', null);
+            }
+
+            var min = state.data.min;
+            var name = state.tmp.__commonMin;
+
+            if(name === null) {
+                // we don't need commonMin
+                //state.log('no need for commonMin');
+                return min;
+            }
+
+            var t = this.keys[name];
+            if(typeof t === 'undefined') {
+                // add our commonMin
+                this.keys[name] = {};
+                t = this.keys[name];
+            }
+
+            var uuid = state.uuid;
+            if(typeof t[uuid] !== 'undefined') {
+                if(t[uuid] === min) {
+                    //state.log('commonMin ' + state.tmp.__commonMin + ' not changed: ' + this.latest[name]);
+                    return this.latest[name];
+                }
+                else if(min < this.latest[name]) {
+                    //state.log('commonMin ' + state.tmp.__commonMin + ' increased: ' + min);
+                    t[uuid] = min;
+                    this.latest[name] = min;
+                    return min;
+                }
+            }
+
+            // add our min
+            t[uuid] = min;
+
+            // find the common min
+            var m = min;
+            for(var i in t)
+                if(t.hasOwnProperty(i) && t[i] < m) m = t[i];
+
+            //state.log('commonMin ' + state.tmp.__commonMin + ' updated: ' + m);
+            this.latest[name] = m;
+            return m;
+        }
+    };
+
+    NETDATA.commonMax = {
+        keys: {},
+        latest: {},
+
+        globalReset: function() {
+            this.keys = {};
+            this.latest = {};
+        },
+
+        get: function(state) {
+            if(typeof state.tmp.__commonMax === 'undefined') {
+                // get the commonMax setting
+                state.tmp.__commonMax = NETDATA.dataAttribute(state.element, 'common-max', null);
+            }
+
+            var max = state.data.max;
+            var name = state.tmp.__commonMax;
+
+            if(name === null) {
+                // we don't need commonMax
+                //state.log('no need for commonMax');
+                return max;
+            }
+
+            var t = this.keys[name];
+            if(typeof t === 'undefined') {
+                // add our commonMax
+                this.keys[name] = {};
+                t = this.keys[name];
+            }
+
+            var uuid = state.uuid;
+            if(typeof t[uuid] !== 'undefined') {
+                if(t[uuid] === max) {
+                    //state.log('commonMax ' + state.tmp.__commonMax + ' not changed: ' + this.latest[name]);
+                    return this.latest[name];
+                }
+                else if(max > this.latest[name]) {
+                    //state.log('commonMax ' + state.tmp.__commonMax + ' increased: ' + max);
+                    t[uuid] = max;
+                    this.latest[name] = max;
+                    return max;
+                }
+            }
+
+            // add our max
+            t[uuid] = max;
+
+            // find the common max
+            var m = max;
+            for(var i in t)
+                if(t.hasOwnProperty(i) && t[i] > m) m = t[i];
+
+            //state.log('commonMax ' + state.tmp.__commonMax + ' updated: ' + m);
+            this.latest[name] = m;
+            return m;
+        }
+    };
+
+    NETDATA.commonColors = {
+        keys: {},
+
+        globalReset: function() {
+            this.keys = {};
+        },
+
+        get: function(state, label) {
+            var ret = this.refill(state);
+
+            if(typeof ret.assigned[label] === 'undefined')
+                ret.assigned[label] = ret.available.shift();
+
+            return ret.assigned[label];
+        },
+
+        refill: function(state) {
+            var ret, len;
+
+            if(typeof state.tmp.__commonColors === 'undefined')
+                ret = this.prepare(state);
+            else {
+                ret = this.keys[state.tmp.__commonColors];
+                if(typeof ret === 'undefined')
+                    ret = this.prepare(state);
+            }
+
+            if(ret.available.length === 0) {
+                if(ret.copy_theme === true || ret.custom.length === 0) {
+                    // copy the theme colors
+                    len = NETDATA.themes.current.colors.length;
+                    while (len--)
+                        ret.available.unshift(NETDATA.themes.current.colors[len]);
+                }
+
+                // copy the custom colors
+                len = ret.custom.length;
+                while (len--)
+                    ret.available.unshift(ret.custom[len]);
+            }
+
+            state.colors_assigned = ret.assigned;
+            state.colors_available = ret.available;
+            state.colors_custom = ret.custom;
+
+            return ret;
+        },
+
+        __read_custom_colors: function(state, ret) {
+            // add the user supplied colors
+            var c = NETDATA.dataAttribute(state.element, 'colors', undefined);
+            if (typeof c === 'string' && c.length > 0) {
+                c = c.split(' ');
+                var len = c.length;
+
+                if (len > 0 && c[len - 1] === 'ONLY') {
+                    len--;
+                    ret.copy_theme = false;
+                }
+
+                while (len--)
+                    ret.custom.unshift(c[len]);
+            }
+        },
+
+        prepare: function(state) {
+            var has_custom_colors = false;
+
+            if(typeof state.tmp.__commonColors === 'undefined') {
+                var defname = state.chart.context;
+
+                // if this chart has data-colors=""
+                // we should use the chart uuid as the default key (private palette)
+                // (data-common-colors="NAME" will be used anyways)
+                var c = NETDATA.dataAttribute(state.element, 'colors', undefined);
+                if (typeof c === 'string' && c.length > 0) {
+                    defname = state.uuid;
+                    has_custom_colors = true;
+                }
+
+                // get the commonColors setting
+                state.tmp.__commonColors = NETDATA.dataAttribute(state.element, 'common-colors', defname);
+            }
+
+            var name = state.tmp.__commonColors;
+            var ret = this.keys[name];
+
+            if(typeof ret === 'undefined') {
+                // add our commonMax
+                this.keys[name] = {
+                    assigned: {},       // name-value of dimensions and their colors
+                    available: [],      // an array of colors available to be used
+                    custom: [],         // the array of colors defined by the user
+                    charts: {},         // the charts linked to this
+                    copy_theme: true
+                };
+                ret = this.keys[name];
+            }
+
+            if(typeof ret.charts[state.uuid] === 'undefined') {
+                ret.charts[state.uuid] = state;
+
+                if(has_custom_colors === true)
+                    this.__read_custom_colors(state, ret);
+            }
+
+            return ret;
+        }
+    };
+
+    // ----------------------------------------------------------------------------------------------------------------
+    // Chart Registry
+
+    // When multiple charts need the same chart, we avoid downloading it
+    // multiple times (and having it in browser memory multiple time)
+    // by using this registry.
+
+    // Every time we download a chart definition, we save it here with .add()
+    // Then we try to get it back with .get(). If that fails, we download it.
+
+    NETDATA.fixHost = function(host) {
+        while(host.slice(-1) === '/')
+            host = host.substring(0, host.length - 1);
+
+        return host;
+    };
+
+    NETDATA.chartRegistry = {
+        charts: {},
+
+        globalReset: function() {
+            this.charts = {};
+        },
+
+        add: function(host, id, data) {
+            if(typeof this.charts[host] === 'undefined')
+                this.charts[host] = {};
+
+            //console.log('added ' + host + '/' + id);
+            this.charts[host][id] = data;
+        },
+
+        get: function(host, id) {
+            if(typeof this.charts[host] === 'undefined')
+                return null;
+
+            if(typeof this.charts[host][id] === 'undefined')
+                return null;
+
+            //console.log('cached ' + host + '/' + id);
+            return this.charts[host][id];
+        },
+
+        downloadAll: function(host, callback) {
+            host = NETDATA.fixHost(host);
+
+            var self = this;
+
+            function got_data(h, data, callback) {
+                if(data !== null) {
+                    self.charts[h] = data.charts;
+
+                    // update the server timezone in our options
+                    if(typeof data.timezone === 'string')
+                        NETDATA.options.server_timezone = data.timezone;
+                }
+                else NETDATA.error(406, h + '/api/v1/charts');
+
+                if(typeof callback === 'function')
+                    callback(data);
+            }
+
+            if(netdataSnapshotData !== null) {
+                got_data(host, netdataSnapshotData.charts, callback);
+            }
+            else {
+                $.ajax({
+                    url: host + '/api/v1/charts',
+                    async: true,
+                    cache: false,
+                    xhrFields: {withCredentials: true} // required for the cookie
+                })
+                    .done(function (data) {
+                        data = NETDATA.xss.checkOptional('/api/v1/charts', data);
+                        got_data(host, data, callback);
+                    })
+                    .fail(function () {
+                        NETDATA.error(405, host + '/api/v1/charts');
+
+                        if (typeof callback === 'function')
+                            callback(null);
+                    });
+            }
+        }
+    };
+
+    // ----------------------------------------------------------------------------------------------------------------
+    // Global Pan and Zoom on charts
+
+    // Using this structure are synchronize all the charts, so that
+    // when you pan or zoom one, all others are automatically refreshed
+    // to the same timespan.
+
+    NETDATA.globalPanAndZoom = {
+        seq: 0,                 // timestamp ms
+                                // every time a chart is panned or zoomed
+                                // we set the timestamp here
+                                // then we use it as a sequence number
+                                // to find if other charts are synchronized
+                                // to this time-range
+
+        master: null,           // the master chart (state), to which all others
+                                // are synchronized
+
+        force_before_ms: null,  // the timespan to sync all other charts
+        force_after_ms: null,
+
+        callback: null,
+
+        globalReset: function() {
+            this.clearMaster();
+            this.seq = 0;
+            this.master = null;
+            this.force_after_ms = null;
+            this.force_before_ms = null;
+            this.callback = null;
+        },
+
+        delay: function() {
+            if(NETDATA.options.debug.globalPanAndZoom === true)
+                console.log('globalPanAndZoom.delay()');
+
+            NETDATA.options.auto_refresher_stop_until = Date.now() + NETDATA.options.current.global_pan_sync_time;
+        },
+
+        // set a new master
+        setMaster: function(state, after, before) {
+            this.delay();
+
+            if(NETDATA.options.current.sync_pan_and_zoom === false)
+                return;
+
+            if(this.master === null) {
+                if(NETDATA.options.debug.globalPanAndZoom === true)
+                    console.log('globalPanAndZoom.setMaster(' + state.id + ', ' + after + ', ' + before + ') SET MASTER');
+            }
+            else if(this.master !== state) {
+                if(NETDATA.options.debug.globalPanAndZoom === true)
+                    console.log('globalPanAndZoom.setMaster(' + state.id + ', ' + after + ', ' + before + ') CHANGED MASTER');
+
+                this.master.resetChart(true, true);
+            }
+
+            var now = Date.now();
+            this.master = state;
+            this.seq = now;
+            this.force_after_ms = after;
+            this.force_before_ms = before;
+
+            if(typeof this.callback === 'function')
+                this.callback(true, after, before);
+        },
+
+        // clear the master
+        clearMaster: function() {
+            if(NETDATA.options.debug.globalPanAndZoom === true)
+                console.log('globalPanAndZoom.clearMaster()');
+
+            if(this.master !== null) {
+                var st = this.master;
+                this.master = null;
+                st.resetChart();
+            }
+
+            this.master = null;
+            this.seq = 0;
+            this.force_after_ms = null;
+            this.force_before_ms = null;
+            NETDATA.options.auto_refresher_stop_until = 0;
+
+            if(typeof this.callback === 'function')
+                this.callback(false, 0, 0);
+        },
+
+        // is the given state the master of the global
+        // pan and zoom sync?
+        isMaster: function(state) {
+            return (this.master === state);
+        },
+
+        // are we currently have a global pan and zoom sync?
+        isActive: function() {
+            return (this.master !== null && this.force_before_ms !== null && this.force_after_ms !== null && this.seq !== 0);
+        },
+
+        // check if a chart, other than the master
+        // needs to be refreshed, due to the global pan and zoom
+        shouldBeAutoRefreshed: function(state) {
+            if(this.master === null || this.seq === 0)
+                return false;
+
+            //if(state.needsRecreation())
+            //  return true;
+
+            return (state.tm.pan_and_zoom_seq !== this.seq);
+        }
+    };
+
+    // ----------------------------------------------------------------------------------------------------------------
+    // global chart underlay (time-frame highlighting)
+
+    NETDATA.globalChartUnderlay = {
+        callback: null,         // what to call when a highlighted range is setup
+        after: null,            // highlight after this time
+        before: null,           // highlight before this time
+        view_after: null,       // the charts after_ms viewport when the highlight was setup
+        view_before: null,      // the charts before_ms viewport, when the highlight was setup
+        state: null,            // the chart the highlight was setup
+
+        isActive: function() {
+            return (this.after !== null && this.before !== null);
+        },
+
+        hasViewport: function() {
+            return (this.state !== null && this.view_after !== null && this.view_before !== null);
+        },
+
+        init: function(state, after, before, view_after, view_before) {
+            this.state = (typeof state !== 'undefined') ? state : null;
+            this.after = (typeof after !== 'undefined' && after !== null && after > 0) ? after : null;
+            this.before = (typeof before !== 'undefined' && before !== null && before > 0) ? before : null;
+            this.view_after = (typeof view_after !== 'undefined' && view_after !== null && view_after > 0) ? view_after : null;
+            this.view_before = (typeof view_before !== 'undefined' && view_before !== null && view_before > 0) ? view_before : null;
+        },
+
+        setup: function() {
+            if(this.isActive() === true) {
+                if (this.state === null)
+                    this.state = NETDATA.options.targets[0];
+
+                if (typeof this.callback === 'function')
+                    this.callback(true, this.after, this.before);
+            }
+            else {
+                if (typeof this.callback === 'function')
+                    this.callback(false, 0, 0);
+            }
+        },
+
+        set: function(state, after, before, view_after, view_before) {
+            if(after > before) {
+                var t = after;
+                after = before;
+                before = t;
+            }
+
+            this.init(state, after, before, view_after, view_before);
+
+            if (this.hasViewport() === true)
+                NETDATA.globalPanAndZoom.setMaster(this.state, this.view_after, this.view_before);
+
+            this.setup();
+        },
+
+        clear: function() {
+            this.after = null;
+            this.before = null;
+            this.state = null;
+            this.view_after = null;
+            this.view_before = null;
+
+            if(typeof this.callback === 'function')
+                this.callback(false, 0, 0);
+        },
+
+        focus: function() {
+            if(this.isActive() === true && this.hasViewport() === true) {
+                if(this.state === null)
+                    this.state = NETDATA.options.targets[0];
+
+                if(NETDATA.globalPanAndZoom.isMaster(this.state) === true)
+                    NETDATA.globalPanAndZoom.clearMaster();
+
+                NETDATA.globalPanAndZoom.setMaster(this.state, this.view_after, this.view_before, true);
+            }
+        }
+    };
+
+    // ----------------------------------------------------------------------------------------------------------------
+    // dimensions selection
+
+    // TODO
+    // move color assignment to dimensions, here
+
+    var dimensionStatus = function(parent, label, name_div, value_div, color) {
+        this.enabled = false;
+        this.parent = parent;
+        this.label = label;
+        this.name_div = null;
+        this.value_div = null;
+        this.color = NETDATA.themes.current.foreground;
+        this.selected = (parent.unselected_count === 0);
+
+        this.setOptions(name_div, value_div, color);
+    };
+
+    dimensionStatus.prototype.invalidate = function() {
+        this.name_div = null;
+        this.value_div = null;
+        this.enabled = false;
+    };
+
+    dimensionStatus.prototype.setOptions = function(name_div, value_div, color) {
+        this.color = color;
+
+        if(this.name_div !== name_div) {
+            this.name_div = name_div;
+            this.name_div.title = this.label;
+            this.name_div.style.setProperty('color', this.color, 'important');
+            if(this.selected === false)
+                this.name_div.className = 'netdata-legend-name not-selected';
+            else
+                this.name_div.className = 'netdata-legend-name selected';
+        }
+
+        if(this.value_div !== value_div) {
+            this.value_div = value_div;
+            this.value_div.title = this.label;
+            this.value_div.style.setProperty('color', this.color, 'important');
+            if(this.selected === false)
+                this.value_div.className = 'netdata-legend-value not-selected';
+            else
+                this.value_div.className = 'netdata-legend-value selected';
+        }
+
+        this.enabled = true;
+        this.setHandler();
+    };
+
+    dimensionStatus.prototype.setHandler = function() {
+        if(this.enabled === false) return;
+
+        var ds = this;
+
+        // this.name_div.onmousedown = this.value_div.onmousedown = function(e) {
+        this.name_div.onclick = this.value_div.onclick = function(e) {
+            e.preventDefault();
+            if(ds.isSelected()) {
+                // this is selected
+                if(e.shiftKey === true || e.ctrlKey === true) {
+                    // control or shift key is pressed -> unselect this (except is none will remain selected, in which case select all)
+                    ds.unselect();
+
+                    if(ds.parent.countSelected() === 0)
+                        ds.parent.selectAll();
+                }
+                else {
+                    // no key is pressed -> select only this (except if it is the only selected already, in which case select all)
+                    if(ds.parent.countSelected() === 1) {
+                        ds.parent.selectAll();
+                    }
+                    else {
+                        ds.parent.selectNone();
+                        ds.select();
+                    }
+                }
+            }
+            else {
+                // this is not selected
+                if(e.shiftKey === true || e.ctrlKey === true) {
+                    // control or shift key is pressed -> select this too
+                    ds.select();
+                }
+                else {
+                    // no key is pressed -> select only this
+                    ds.parent.selectNone();
+                    ds.select();
+                }
+            }
+
+            ds.parent.state.redrawChart();
+        }
+    };
+
+    dimensionStatus.prototype.select = function() {
+        if(this.enabled === false) return;
+
+        this.name_div.className = 'netdata-legend-name selected';
+        this.value_div.className = 'netdata-legend-value selected';
+        this.selected = true;
+    };
+
+    dimensionStatus.prototype.unselect = function() {
+        if(this.enabled === false) return;
+
+        this.name_div.className = 'netdata-legend-name not-selected';
+        this.value_div.className = 'netdata-legend-value hidden';
+        this.selected = false;
+    };
+
+    dimensionStatus.prototype.isSelected = function() {
+        return(this.enabled === true && this.selected === true);
+    };
+
+    // ----------------------------------------------------------------------------------------------------------------
+
+    var dimensionsVisibility = function(state) {
+        this.state = state;
+        this.len = 0;
+        this.dimensions = {};
+        this.selected_count = 0;
+        this.unselected_count = 0;
+    };
+
+    dimensionsVisibility.prototype.dimensionAdd = function(label, name_div, value_div, color) {
+        if(typeof this.dimensions[label] === 'undefined') {
+            this.len++;
+            this.dimensions[label] = new dimensionStatus(this, label, name_div, value_div, color);
+        }
+        else
+            this.dimensions[label].setOptions(name_div, value_div, color);
+
+        return this.dimensions[label];
+    };
+
+    dimensionsVisibility.prototype.dimensionGet = function(label) {
+        return this.dimensions[label];
+    };
+
+    dimensionsVisibility.prototype.invalidateAll = function() {
+        var keys = Object.keys(this.dimensions);
+        var len = keys.length;
+        while(len--)
+            this.dimensions[keys[len]].invalidate();
+    };
+
+    dimensionsVisibility.prototype.selectAll = function() {
+        var keys = Object.keys(this.dimensions);
+        var len = keys.length;
+        while(len--)
+            this.dimensions[keys[len]].select();
+    };
+
+    dimensionsVisibility.prototype.countSelected = function() {
+        var selected = 0;
+        var keys = Object.keys(this.dimensions);
+        var len = keys.length;
+        while(len--)
+            if(this.dimensions[keys[len]].isSelected()) selected++;
+
+        return selected;
+    };
+
+    dimensionsVisibility.prototype.selectNone = function() {
+        var keys = Object.keys(this.dimensions);
+        var len = keys.length;
+        while(len--)
+            this.dimensions[keys[len]].unselect();
+    };
+
+    dimensionsVisibility.prototype.selected2BooleanArray = function(array) {
+        var ret = [];
+        this.selected_count = 0;
+        this.unselected_count = 0;
+
+        var len = array.length;
+        while(len--) {
+            var ds = this.dimensions[array[len]];
+            if(typeof ds === 'undefined') {
+                // console.log(array[i] + ' is not found');
+                ret.unshift(false);
+            }
+            else if(ds.isSelected()) {
+                ret.unshift(true);
+                this.selected_count++;
+            }
+            else {
+                ret.unshift(false);
+                this.unselected_count++;
+            }
+        }
+
+        if(this.selected_count === 0 && this.unselected_count !== 0) {
+            this.selectAll();
+            return this.selected2BooleanArray(array);
+        }
+
+        return ret;
+    };
+
+
+    // ----------------------------------------------------------------------------------------------------------------
+    // date/time conversion
+
+    NETDATA.dateTime = {
+        using_timezone: false,
+
+        // these are the old netdata functions
+        // we fallback to these, if the new ones fail
+
+        localeDateStringNative: function(d) {
+            return d.toLocaleDateString();
+        },
+
+        localeTimeStringNative: function(d) {
+            return d.toLocaleTimeString();
+        },
+
+        xAxisTimeStringNative: function(d) {
+            return NETDATA.zeropad(d.getHours())  + ":"
+                + NETDATA.zeropad(d.getMinutes()) + ":"
+                + NETDATA.zeropad(d.getSeconds());
+        },
+
+        // initialize the new date/time conversion
+        // functions.
+        // if this fails, we fallback to the above
+        init: function(timezone) {
+            //console.log('init with timezone: ' + timezone);
+
+            // detect browser timezone
+            try {
+                NETDATA.options.browser_timezone = Intl.DateTimeFormat().resolvedOptions().timeZone;
+            }
+            catch(e) {
+                console.log('failed to detect browser timezone: ' + e.toString());
+                NETDATA.options.browser_timezone = 'cannot-detect-it';
+            }
+
+            var ret = false;
+
+            try {
+                var dateOptions ={
+                    localeMatcher: 'best fit',
+                    formatMatcher: 'best fit',
+                    weekday: 'short',
+                    year: 'numeric',
+                    month: 'short',
+                    day: '2-digit'
+                };
+
+                var timeOptions = {
+                    localeMatcher: 'best fit',
+                    hour12: false,
+                    formatMatcher: 'best fit',
+                    hour: '2-digit',
+                    minute: '2-digit',
+                    second: '2-digit'
+                };
+
+                var xAxisOptions = {
+                    localeMatcher: 'best fit',
+                    hour12: false,
+                    formatMatcher: 'best fit',
+                    hour: '2-digit',
+                    minute: '2-digit',
+                    second: '2-digit'
+                };
+
+                if(typeof timezone === 'string' && timezone !== '' && timezone !== 'default') {
+                    dateOptions.timeZone  = timezone;
+                    timeOptions.timeZone  = timezone;
+                    timeOptions.timeZoneName = 'short';
+                    xAxisOptions.timeZone = timezone;
+                    this.using_timezone = true;
+                }
+                else {
+                    timezone = 'default';
+                    this.using_timezone = false;
+                }
+
+                this.dateFormat  = new Intl.DateTimeFormat(navigator.language, dateOptions);
+                this.timeFormat  = new Intl.DateTimeFormat(navigator.language, timeOptions);
+                this.xAxisFormat = new Intl.DateTimeFormat(navigator.language, xAxisOptions);
+
+                this.localeDateString = function(d) {
+                    return this.dateFormat.format(d);
+                };
+
+                this.localeTimeString = function(d) {
+                    return this.timeFormat.format(d);
+                };
+
+                this.xAxisTimeString = function(d) {
+                    return this.xAxisFormat.format(d);
+                };
+
+                //var d = new Date();
+                //var t = this.dateFormat.format(d) + ' ' + this.timeFormat.format(d) + ' ' + this.xAxisFormat.format(d);
+
+                ret = true;
+            }
+            catch(e) {
+                console.log('Cannot setup Date/Time formatting: ' + e.toString());
+
+                timezone = 'default';
+                this.localeDateString = this.localeDateStringNative;
+                this.localeTimeString = this.localeTimeStringNative;
+                this.xAxisTimeString  = this.xAxisTimeStringNative;
+                this.using_timezone = false;
+
+                ret = false;
+            }
+
+            // save it
+            //console.log('init setOption timezone: ' + timezone);
+            NETDATA.setOption('timezone', timezone);
+
+            return ret;
+        }
+    };
+    NETDATA.dateTime.init(NETDATA.options.current.timezone);
+
+
+    // ----------------------------------------------------------------------------------------------------------------
+    // units conversion
+
+    NETDATA.unitsConversion = {
+        keys: {},       // keys for data-common-units
+        latest: {},     // latest selected units for data-common-units
+
+        globalReset: function() {
+            this.keys = {};
+            this.latest = {};
+        },
+
+        scalableUnits: {
+            'packets/s': {
+                'pps': 1,
+                'Kpps': 1000,
+                'Mpps': 1000000
+            },
+            'pps': {
+                'pps': 1,
+                'Kpps': 1000,
+                'Mpps': 1000000
+            },
+            'kilobits/s': {
+                'bits/s': 1 / 1000,
+                'kilobits/s': 1,
+                'megabits/s': 1000,
+                'gigabits/s': 1000000,
+                'terabits/s': 1000000000
+            },
+            'kilobytes/s': {
+                'bytes/s': 1 / 1024,
+                'kilobytes/s': 1,
+                'megabytes/s': 1024,
+                'gigabytes/s': 1024 * 1024,
+                'terabytes/s': 1024 * 1024 * 1024
+            },
+            'KB/s': {
+                'B/s': 1 / 1024,
+                'KB/s': 1,
+                'MB/s': 1024,
+                'GB/s': 1024 * 1024,
+                'TB/s': 1024 * 1024 * 1024
+            },
+            'KB': {
+                'B': 1 / 1024,
+                'KB': 1,
+                'MB': 1024,
+                'GB': 1024 * 1024,
+                'TB': 1024 * 1024 * 1024
+            },
+            'MB': {
+                'B':  1 / (1024 * 1024),
+                'KB': 1 / 1024,
+                'MB': 1,
+                'GB': 1024,
+                'TB': 1024 * 1024,
+                'PB': 1024 * 1024 * 1024
+            },
+            'GB': {
+                'B':  1 / (1024 * 1024 * 1024),
+                'KB': 1 / (1024 * 1024),
+                'MB': 1 / 1024,
+                'GB': 1,
+                'TB': 1024,
+                'PB': 1024 * 1024,
+                'EB': 1024 * 1024 * 1024
+            }
+            /*
+            'milliseconds': {
+                'seconds': 1000
+            },
+            'seconds': {
+                'milliseconds': 0.001,
+                'seconds': 1,
+                'minutes': 60,
+                'hours': 3600,
+                'days': 86400
+            }
+            */
+        },
+
+        convertibleUnits: {
+            'Celsius': {
+                'Fahrenheit': {
+                    check: function(max) { void(max); return NETDATA.options.current.temperature === 'fahrenheit'; },
+                    convert: function(value) { return value * 9 / 5 + 32; }
+                }
+            },
+            'celsius': {
+                'fahrenheit': {
+                    check: function(max) { void(max); return NETDATA.options.current.temperature === 'fahrenheit'; },
+                    convert: function(value) { return value * 9 / 5 + 32; }
+                }
+            },
+            'seconds': {
+                'time': {
+                    check: function (max) { void(max); return NETDATA.options.current.seconds_as_time; },
+                    convert: function(seconds) { return NETDATA.unitsConversion.seconds2time(seconds); }
+                }
+            },
+            'milliseconds': {
+                'milliseconds': {
+                    check: function (max) { return NETDATA.options.current.seconds_as_time && max < 1000; },
+                    convert: function(milliseconds) {
+                        var tms = Math.round(milliseconds * 10);
+                        milliseconds = Math.floor(tms / 10);
+
+                        tms -= milliseconds * 10;
+
+                        return (milliseconds).toString() + '.' + tms.toString();
+                    }
+                },
+                'seconds': {
+                    check: function (max) { return NETDATA.options.current.seconds_as_time && max >= 1000 && max < 60000; },
+                    convert: function(milliseconds) {
+                        milliseconds = Math.round(milliseconds);
+
+                        var seconds = Math.floor(milliseconds / 1000);
+                        milliseconds -= seconds * 1000;
+
+                        milliseconds = Math.round(milliseconds / 10);
+
+                        return seconds.toString() + '.'
+                            + NETDATA.zeropad(milliseconds);
+                    }
+                },
+                'M:SS.ms': {
+                    check: function (max) { return NETDATA.options.current.seconds_as_time && max >= 60000; },
+                    convert: function(milliseconds) {
+                        milliseconds = Math.round(milliseconds);
+
+                        var minutes = Math.floor(milliseconds / 60000);
+                        milliseconds -= minutes * 60000;
+
+                        var seconds = Math.floor(milliseconds / 1000);
+                        milliseconds -= seconds * 1000;
+
+                        milliseconds = Math.round(milliseconds / 10);
+
+                        return minutes.toString() + ':'
+                            + NETDATA.zeropad(seconds) + '.'
+                            + NETDATA.zeropad(milliseconds);
+                    }
+                }
+            }
+        },
+
+        seconds2time: function(seconds) {
+            seconds = Math.abs(seconds);
+
+            var days = Math.floor(seconds / 86400);
+            seconds -= days * 86400;
+
+            var hours = Math.floor(seconds / 3600);
+            seconds -= hours * 3600;
+
+            var minutes = Math.floor(seconds / 60);
+            seconds -= minutes * 60;
+
+            seconds = Math.round(seconds);
+
+            var ms_txt = '';
+            /*
+            var ms = seconds - Math.floor(seconds);
+            seconds -= ms;
+            ms = Math.round(ms * 1000);
+
+            if(ms > 1) {
+                if(ms < 10)
+                    ms_txt = '.00' + ms.toString();
+                else if(ms < 100)
+                    ms_txt = '.0' + ms.toString();
+                else
+                    ms_txt = '.' + ms.toString();
+            }
+            */
+
+            return ((days > 0)?days.toString() + 'd:':'').toString()
+                + NETDATA.zeropad(hours) + ':'
+                + NETDATA.zeropad(minutes) + ':'
+                + NETDATA.zeropad(seconds)
+                + ms_txt;
+        },
+
+        // get a function that converts the units
+        // + every time units are switched call the callback
+        get: function(uuid, min, max, units, desired_units, common_units_name, switch_units_callback) {
+            // validate the parameters
+            if(typeof units === 'undefined')
+                units = 'undefined';
+
+            // check if we support units conversion
+            if(typeof this.scalableUnits[units] === 'undefined' && typeof this.convertibleUnits[units] === 'undefined') {
+                // we can't convert these units
+                //console.log('DEBUG: ' + uuid.toString() + ' can\'t convert units: ' + units.toString());
+                return function(value) { return value; };
+            }
+
+            // check if the caller wants the original units
+            if(typeof desired_units === 'undefined' || desired_units === null || desired_units === 'original' || desired_units === units) {
+                //console.log('DEBUG: ' + uuid.toString() + ' original units wanted');
+                switch_units_callback(units);
+                return function(value) { return value; };
+            }
+
+            // now we know we can convert the units
+            // and the caller wants some kind of conversion
+
+            var tunits = null;
+            var tdivider = 0;
+            var x;
+
+            if(typeof this.scalableUnits[units] !== 'undefined') {
+                // units that can be scaled
+                // we decide a divider
+
+                // console.log('NETDATA.unitsConversion.get(' + units.toString() + ', ' + desired_units.toString() + ', function()) decide divider with min = ' + min.toString() + ', max = ' + max.toString());
+
+                if (desired_units === 'auto') {
+                    // the caller wants to auto-scale the units
+
+                    // find the absolute maximum value that is rendered on the chart
+                    // based on this we decide the scale
+                    min = Math.abs(min);
+                    max = Math.abs(max);
+                    if (min > max) max = min;
+
+                    // find the smallest scale that provides integers
+                    for (x in this.scalableUnits[units]) {
+                        if (this.scalableUnits[units].hasOwnProperty(x)) {
+                            var m = this.scalableUnits[units][x];
+                            if (m <= max && m > tdivider) {
+                                tunits = x;
+                                tdivider = m;
+                            }
+                        }
+                    }
+
+                    if(tunits === null || tdivider <= 0) {
+                        // we couldn't find one
+                        //console.log('DEBUG: ' + uuid.toString() + ' cannot find an auto-scaling candidate for units: ' + units.toString() + ' (max: ' + max.toString() + ')');
+                        switch_units_callback(units);
+                        return function(value) { return value; };
+                    }
+
+                    if(typeof common_units_name === 'string' && typeof uuid === 'string') {
+                        // the caller wants several charts to have the same units
+                        // data-common-units
+
+                        var common_units_key = common_units_name + '-' + units;
+
+                        // add our divider into the list of keys
+                        var t = this.keys[common_units_key];
+                        if(typeof t === 'undefined') {
+                            this.keys[common_units_key] = {};
+                            t = this.keys[common_units_key];
+                        }
+                        t[uuid] = {
+                            units: tunits,
+                            divider: tdivider
+                        };
+
+                        // find the max divider of all charts
+                        var common_units = t[uuid];
+                        for(x in t) {
+                            if (t.hasOwnProperty(x) && t[x].divider > common_units.divider)
+                                common_units = t[x];
+                        }
+
+                        // save our common_max to the latest keys
+                        var latest = this.latest[common_units_key];
+                        if(typeof latest === 'undefined') {
+                            this.latest[common_units_key] = {};
+                            latest = this.latest[common_units_key];
+                        }
+                        latest.units = common_units.units;
+                        latest.divider = common_units.divider;
+
+                        tunits = latest.units;
+                        tdivider = latest.divider;
+
+                        //console.log('DEBUG: ' + uuid.toString() + ' converted units: ' + units.toString() + ' to units: ' + tunits.toString() + ' with divider ' + tdivider.toString() + ', common-units=' + common_units_name.toString() + ((t[uuid].divider !== tdivider)?' USED COMMON, mine was ' + t[uuid].units:' set common').toString());
+
+                        // apply it to this chart
+                        switch_units_callback(tunits);
+                        return function(value) {
+                            if(tdivider !== latest.divider) {
+                                // another chart switched our common units
+                                // we should switch them too
+                                //console.log('DEBUG: ' + uuid + ' switching units due to a common-units change, from ' + tunits.toString() + ' to ' + latest.units.toString());
+                                tunits = latest.units;
+                                tdivider = latest.divider;
+                                switch_units_callback(tunits);
+                            }
+
+                            return value / tdivider;
+                        };
+                    }
+                    else {
+                        // the caller did not give data-common-units
+                        // this chart auto-scales independently of all others
+                        //console.log('DEBUG: ' + uuid.toString() + ' converted units: ' + units.toString() + ' to units: ' + tunits.toString() + ' with divider ' + tdivider.toString() + ', autonomously');
+
+                        switch_units_callback(tunits);
+                        return function (value) { return value / tdivider; };
+                    }
+                }
+                else {
+                    // the caller wants specific units
+
+                    if(typeof this.scalableUnits[units][desired_units] !== 'undefined') {
+                        // all good, set the new units
+                        tdivider = this.scalableUnits[units][desired_units];
+                        // console.log('DEBUG: ' + uuid.toString() + ' converted units: ' + units.toString() + ' to units: ' + desired_units.toString() + ' with divider ' + tdivider.toString() + ', by reference');
+                        switch_units_callback(desired_units);
+                        return function (value) { return value / tdivider; };
+                    }
+                    else {
+                        // oops! switch back to original units
+                        console.log('Units conversion from ' + units.toString() + ' to ' + desired_units.toString() + ' is not supported.');
+                        switch_units_callback(units);
+                        return function (value) { return value; };
+                    }
+                }
+           }
+           else if(typeof this.convertibleUnits[units] !== 'undefined') {
+                // units that can be converted
+                if(desired_units === 'auto') {
+                    for(x in this.convertibleUnits[units]) {
+                        if (this.convertibleUnits[units].hasOwnProperty(x)) {
+                            if (this.convertibleUnits[units][x].check(max)) {
+                                //console.log('DEBUG: ' + uuid.toString() + ' converting ' + units.toString() + ' to: ' + x.toString());
+                                switch_units_callback(x);
+                                return this.convertibleUnits[units][x].convert;
+                            }
+                        }
+                    }
+
+                    // none checked ok
+                    //console.log('DEBUG: ' + uuid.toString() + ' no conversion available for ' + units.toString() + ' to: ' + desired_units.toString());
+                    switch_units_callback(units);
+                    return function (value) { return value; };
+                }
+                else if(typeof this.convertibleUnits[units][desired_units] !== 'undefined') {
+                    switch_units_callback(desired_units);
+                    return this.convertibleUnits[units][desired_units].convert;
+                }
+                else {
+                    console.log('Units conversion from ' + units.toString() + ' to ' + desired_units.toString() + ' is not supported.');
+                    switch_units_callback(units);
+                    return function (value) { return value; };
+                }
+           }
+           else {
+                // hm... did we forget to implement the new type?
+                console.log('Unmatched unit conversion method for units ' + units.toString());
+                switch_units_callback(units);
+                return function (value) { return value; };
+           }
+        }
+    };
+
+    // ----------------------------------------------------------------------------------------------------------------
+    // global selection sync
+
+    NETDATA.globalSelectionSync = {
+        state: null,
+        dont_sync_before: 0,
+        last_t: 0,
+        slaves: [],
+        timeout_id: undefined,
+
+        globalReset: function() {
+            this.stop();
+            this.state = null;
+            this.dont_sync_before =  0;
+            this.last_t = 0;
+            this.slaves = [];
+            this.timeout_id = undefined;
+        },
+
+        active: function() {
+            return (this.state !== null);
+        },
+
+        // return true if global selection sync can be enabled now
+        enabled: function() {
+            // console.log('enabled()');
+            // can we globally apply selection sync?
+            if(NETDATA.options.current.sync_selection === false)
+                return false;
+
+            return (this.dont_sync_before <= Date.now());
+        },
+
+        // set the global selection sync master
+        setMaster: function(state) {
+            if(this.enabled() === false) {
+                this.stop();
+                return;
+            }
+
+            if(this.state === state)
+                return;
+
+            if(this.state !== null)
+                this.stop();
+
+            if(NETDATA.options.debug.globalSelectionSync === true)
+                console.log('globalSelectionSync.setMaster(' + state.id + ')');
+
+            state.selected = true;
+            this.state = state;
+            this.last_t = 0;
+
+            // find all slaves
+            var targets = NETDATA.intersectionObserver.targets();
+            this.slaves = [];
+            var len = targets.length;
+            while(len--) {
+                var st = targets[len];
+                if (this.state !== st && st.globalSelectionSyncIsEligible() === true)
+                    this.slaves.push(st);
+            }
+
+            // this.delay(100);
+        },
+
+        // stop global selection sync
+        stop: function() {
+            if(this.state !== null) {
+                if(NETDATA.options.debug.globalSelectionSync === true)
+                    console.log('globalSelectionSync.stop()');
+
+                var len = this.slaves.length;
+                while (len--)
+                    this.slaves[len].clearSelection();
+
+                this.state.clearSelection();
+
+                this.last_t = 0;
+                this.slaves = [];
+                this.state = null;
+            }
+        },
+
+        // delay global selection sync for some time
+        delay: function(ms) {
+            if(NETDATA.options.current.sync_selection === true) {
+                if(NETDATA.options.debug.globalSelectionSync === true)
+                    console.log('globalSelectionSync.delay()');
+
+                if(typeof ms === 'number')
+                    this.dont_sync_before = Date.now() + ms;
+                else
+                    this.dont_sync_before = Date.now() + NETDATA.options.current.sync_selection_delay;
+            }
+        },
+
+        __syncSlaves: function() {
+            if(NETDATA.globalSelectionSync.enabled() === true) {
+                if(NETDATA.options.debug.globalSelectionSync === true)
+                    console.log('globalSelectionSync.__syncSlaves()');
+
+                var t = NETDATA.globalSelectionSync.last_t;
+                var len = NETDATA.globalSelectionSync.slaves.length;
+                while (len--)
+                    NETDATA.globalSelectionSync.slaves[len].setSelection(t);
+
+                this.timeout_id = undefined;
+            }
+        },
+
+        // sync all the visible charts to the given time
+        // this is to be called from the chart libraries
+        sync: function(state, t) {
+            if(NETDATA.options.current.sync_selection === true) {
+                if(NETDATA.options.debug.globalSelectionSync === true)
+                    console.log('globalSelectionSync.sync(' + state.id + ', ' + t.toString() + ')');
+
+                this.setMaster(state);
+
+                if(t === this.last_t)
+                    return;
+
+                this.last_t = t;
+
+                if (state.foreign_element_selection !== null)
+                    state.foreign_element_selection.innerText = NETDATA.dateTime.localeDateString(t) + ' ' + NETDATA.dateTime.localeTimeString(t);
+
+                if (this.timeout_id)
+                    NETDATA.timeout.clear(this.timeout_id);
+
+                this.timeout_id = NETDATA.timeout.set(this.__syncSlaves, 0);
+            }
+        }
+    };
+
+    NETDATA.intersectionObserver = {
+        observer: null,
+        visible_targets: [],
+
+        options: {
+            root: null,
+            rootMargin: "0px",
+            threshold: null
+        },
+
+        enabled: function() {
+            return this.observer !== null;
+        },
+
+        globalReset: function() {
+            if(this.observer !== null) {
+                this.visible_targets = [];
+                this.observer.disconnect();
+                this.init();
+            }
+        },
+
+        targets: function() {
+            if(this.enabled() === true && this.visible_targets.length > 0)
+                return this.visible_targets;
+            else
+                return NETDATA.options.targets;
+        },
+
+        switchChartVisibility: function() {
+            var old = this.__visibilityRatioOld;
+
+            if(old !== this.__visibilityRatio) {
+                if (old === 0 && this.__visibilityRatio > 0)
+                    this.unhideChart();
+                else if (old > 0 && this.__visibilityRatio === 0)
+                    this.hideChart();
+
+                this.__visibilityRatioOld = this.__visibilityRatio;
+            }
+        },
+
+        handler: function(entries, observer) {
+            entries.forEach(function(entry) {
+                var state = NETDATA.chartState(entry.target);
+
+                var idx;
+                if(entry.intersectionRatio > 0) {
+                    idx = NETDATA.intersectionObserver.visible_targets.indexOf(state);
+                    if(idx === -1) {
+                        if(NETDATA.scrollUp === true)
+                            NETDATA.intersectionObserver.visible_targets.push(state);
+                        else
+                            NETDATA.intersectionObserver.visible_targets.unshift(state);
+                    }
+                    else if(state.__visibilityRatio === 0)
+                        state.log("was not visible until now, but was already in visible_targets");
+                }
+                else {
+                    idx = NETDATA.intersectionObserver.visible_targets.indexOf(state);
+                    if(idx !== -1)
+                        NETDATA.intersectionObserver.visible_targets.splice(idx, 1);
+                    else if(state.__visibilityRatio > 0)
+                        state.log("was visible, but not found in visible_targets");
+                }
+
+                state.__visibilityRatio = entry.intersectionRatio;
+
+                if(NETDATA.options.current.async_on_scroll === false) {
+                    if(window.requestIdleCallback)
+                        window.requestIdleCallback(function() {
+                            NETDATA.intersectionObserver.switchChartVisibility.call(state);
+                        }, {timeout: 100});
+                    else
+                        NETDATA.intersectionObserver.switchChartVisibility.call(state);
+                }
+            });
+        },
+
+        observe: function(state) {
+            if(this.enabled() === true) {
+                state.__visibilityRatioOld = 0;
+                state.__visibilityRatio = 0;
+                this.observer.observe(state.element);
+
+                state.isVisible = function() {
+                    if(NETDATA.options.current.update_only_visible === false)
+                        return true;
+
+                    NETDATA.intersectionObserver.switchChartVisibility.call(this);
+
+                    return this.__visibilityRatio > 0;
+                }
+            }
+        },
+
+        init: function() {
+            if(typeof netdataIntersectionObserver === 'undefined' || netdataIntersectionObserver === true) {
+                try {
+                    this.observer = new IntersectionObserver(this.handler, this.options);
+                }
+                catch (e) {
+                    console.log("IntersectionObserver is not supported on this browser");
+                    this.observer = null;
+                }
+            }
+            //else {
+            //    console.log("IntersectionObserver is disabled");
+            //}
+        }
+    };
+    NETDATA.intersectionObserver.init();
+
+    // ----------------------------------------------------------------------------------------------------------------
+    // Our state object, where all per-chart values are stored
+
+    var chartState = function(element) {
+        this.element = element;
+
+        // IMPORTANT:
+        // all private functions should use 'that', instead of 'this'
+        var that = this;
+
+        // ============================================================================================================
+        // ERROR HANDLING
+
+        /* error() - private
+         * show an error instead of the chart
+         */
+        var error = function(msg) {
+            var ret = true;
+
+            if(typeof netdataErrorCallback === 'function') {
+                ret = netdataErrorCallback('chart', that.id, msg);
+            }
+
+            if(ret) {
+                that.element.innerHTML = that.id + ': ' + msg;
+                that.enabled = false;
+                that.current = that.pan;
+            }
+        };
+
+        // console logging
+        this.log = function(msg) {
+            console.log(this.id + ' (' + this.library_name + ' ' + this.uuid + '): ' + msg);
+        };
+
+
+        // ============================================================================================================
+        // EARLY INITIALIZATION
+
+        // These are variables that should exist even if the chart is never to be rendered.
+        // Be careful what you add here - there may be thousands of charts on the page.
+
+        // GUID - a unique identifier for the chart
+        this.uuid = NETDATA.guid();
+
+        // string - the name of chart
+        this.id = NETDATA.dataAttribute(this.element, 'netdata', undefined);
+        if(typeof this.id === 'undefined') {
+            error("netdata elements need data-netdata");
+            return;
+        }
+
+        // string - the key for localStorage settings
+        this.settings_id = NETDATA.dataAttribute(this.element, 'id', null);
+
+        // the user given dimensions of the element
+        this.width = NETDATA.dataAttribute(this.element, 'width', NETDATA.chartDefaults.width);
+        this.height = NETDATA.dataAttribute(this.element, 'height', NETDATA.chartDefaults.height);
+        this.height_original = this.height;
+
+        if(this.settings_id !== null) {
+            this.height = NETDATA.localStorageGet('chart_heights.' + this.settings_id, this.height, function(height) {
+                // this is the callback that will be called
+                // if and when the user resets all localStorage variables
+                // to their defaults
+
+                resizeChartToHeight(height);
+            });
+        }
+
+        // the chart library requested by the user
+        this.library_name = NETDATA.dataAttribute(this.element, 'chart-library', NETDATA.chartDefaults.library);
+
+        // check the requested library is available
+        // we don't initialize it here - it will be initialized when
+        // this chart will be first used
+        if(typeof NETDATA.chartLibraries[this.library_name] === 'undefined') {
+            NETDATA.error(402, this.library_name);
+            error('chart library "' + this.library_name + '" is not found');
+            this.enabled = false;
+        }
+        else if(NETDATA.chartLibraries[this.library_name].enabled === false) {
+            NETDATA.error(403, this.library_name);
+            error('chart library "' + this.library_name + '" is not enabled');
+            this.enabled = false;
+        }
+        else
+            this.library = NETDATA.chartLibraries[this.library_name];
+
+        this.auto = {
+            name: 'auto',
+            autorefresh: true,
+            force_update_at: 0, // the timestamp to force the update at
+            force_before_ms: null,
+            force_after_ms: null
+        };
+        this.pan = {
+            name: 'pan',
+            autorefresh: false,
+            force_update_at: 0, // the timestamp to force the update at
+            force_before_ms: null,
+            force_after_ms: null
+        };
+        this.zoom = {
+            name: 'zoom',
+            autorefresh: false,
+            force_update_at: 0, // the timestamp to force the update at
+            force_before_ms: null,
+            force_after_ms: null
+        };
+
+        // this is a pointer to one of the sub-classes below
+        // auto, pan, zoom
+        this.current = this.auto;
+
+        this.running = false;                       // boolean - true when the chart is being refreshed now
+        this.enabled = true;                        // boolean - is the chart enabled for refresh?
+
+        this.force_update_every = null;             // number - overwrite the visualization update frequency of the chart
+
+        this.tmp = {};
+
+        this.foreign_element_before = null;
+        this.foreign_element_after = null;
+        this.foreign_element_duration = null;
+        this.foreign_element_update_every = null;
+        this.foreign_element_selection = null;
+
+        // ============================================================================================================
+        // PRIVATE FUNCTIONS
+
+        // reset the runtime status variables to their defaults
+        var runtimeInit = function() {
+            that.paused = false;                        // boolean - is the chart paused for any reason?
+            that.selected = false;                      // boolean - is the chart shown a selection?
+
+            that.chart_created = false;                 // boolean - is the library.create() been called?
+            that.dom_created = false;                   // boolean - is the chart DOM been created?
+            that.fetching_data = false;                 // boolean - true while we fetch data via ajax
+
+            that.updates_counter = 0;                   // numeric - the number of refreshes made so far
+            that.updates_since_last_unhide = 0;         // numeric - the number of refreshes made since the last time the chart was unhidden
+            that.updates_since_last_creation = 0;       // numeric - the number of refreshes made since the last time the chart was created
+
+            that.tm = {
+                last_initialized: 0,                    // milliseconds - the timestamp it was last initialized
+                last_dom_created: 0,                    // milliseconds - the timestamp its DOM was last created
+                last_mode_switch: 0,                    // milliseconds - the timestamp it switched modes
+
+                last_info_downloaded: 0,                // milliseconds - the timestamp we downloaded the chart
+                last_updated: 0,                        // the timestamp the chart last updated with data
+                pan_and_zoom_seq: 0,                    // the sequence number of the global synchronization
+                                                        // between chart.
+                                                        // Used with NETDATA.globalPanAndZoom.seq
+                last_visible_check: 0,                  // the time we last checked if it is visible
+                last_resized: 0,                        // the time the chart was resized
+                last_hidden: 0,                         // the time the chart was hidden
+                last_unhidden: 0,                       // the time the chart was unhidden
+                last_autorefreshed: 0                   // the time the chart was last refreshed
+            };
+
+            that.data = null;                           // the last data as downloaded from the netdata server
+            that.data_url = 'invalid://';               // string - the last url used to update the chart
+            that.data_points = 0;                       // number - the number of points returned from netdata
+            that.data_after = 0;                        // milliseconds - the first timestamp of the data
+            that.data_before = 0;                       // milliseconds - the last timestamp of the data
+            that.data_update_every = 0;                 // milliseconds - the frequency to update the data
+
+            that.tmp = {};                              // members that can be destroyed to save memory
+        };
+
+        // initialize all the variables that are required for the chart to be rendered
+        var lateInitialization = function() {
+            if(typeof that.host !== 'undefined')
+                return;
+
+            // string - the netdata server URL, without any path
+            that.host = NETDATA.dataAttribute(that.element, 'host', NETDATA.serverDefault);
+
+            // make sure the host does not end with /
+            // all netdata API requests use absolute paths
+            while(that.host.slice(-1) === '/')
+                that.host = that.host.substring(0, that.host.length - 1);
+
+            // string - the grouping method requested by the user
+            that.method = NETDATA.dataAttribute(that.element, 'method', NETDATA.chartDefaults.method);
+            that.gtime = NETDATA.dataAttribute(that.element, 'gtime', 0);
+
+            // the time-range requested by the user
+            that.after = NETDATA.dataAttribute(that.element, 'after', NETDATA.chartDefaults.after);
+            that.before = NETDATA.dataAttribute(that.element, 'before', NETDATA.chartDefaults.before);
+
+            // the pixels per point requested by the user
+            that.pixels_per_point = NETDATA.dataAttribute(that.element, 'pixels-per-point', 1);
+            that.points = NETDATA.dataAttribute(that.element, 'points', null);
+
+            // the forced update_every
+            that.force_update_every = NETDATA.dataAttribute(that.element, 'update-every', null);
+            if(typeof that.force_update_every !== 'number' || that.force_update_every <= 1) {
+                if(that.force_update_every !== null)
+                    that.log('ignoring invalid value of property data-update-every');
+
+                that.force_update_every = null;
+            }
+            else
+                that.force_update_every *= 1000;
+
+            // the dimensions requested by the user
+            that.dimensions = NETDATA.encodeURIComponent(NETDATA.dataAttribute(that.element, 'dimensions', null));
+
+            that.title = NETDATA.dataAttribute(that.element, 'title', null);    // the title of the chart
+            that.units = NETDATA.dataAttribute(that.element, 'units', null);    // the units of the chart dimensions
+            that.units_desired = NETDATA.dataAttribute(that.element, 'desired-units', NETDATA.options.current.units); // the units of the chart dimensions
+            that.units_current = that.units;
+            that.units_common = NETDATA.dataAttribute(that.element, 'common-units', null);
+
+            // additional options to pass to netdata
+            that.append_options = NETDATA.encodeURIComponent(NETDATA.dataAttribute(that.element, 'append-options', null));
+
+            // override options to pass to netdata
+            that.override_options = NETDATA.encodeURIComponent(NETDATA.dataAttribute(that.element, 'override-options', null));
+
+            that.debug = NETDATA.dataAttributeBoolean(that.element, 'debug', false);
+
+            that.value_decimal_detail = -1;
+            var d = NETDATA.dataAttribute(that.element, 'decimal-digits', -1);
+            if(typeof d === 'number')
+                that.value_decimal_detail = d;
+            else if(typeof d !== 'undefined')
+                that.log('ignoring decimal-digits value: ' + d.toString());
+
+            // if we need to report the rendering speed
+            // find the element that needs to be updated
+            var refresh_dt_element_name = NETDATA.dataAttribute(that.element, 'dt-element-name', null); // string - the element to print refresh_dt_ms
+
+            if(refresh_dt_element_name !== null) {
+                that.refresh_dt_element = document.getElementById(refresh_dt_element_name) || null;
+            }
+            else
+                that.refresh_dt_element = null;
+
+            that.dimensions_visibility = new dimensionsVisibility(that);
+
+            that.netdata_first = 0;                     // milliseconds - the first timestamp in netdata
+            that.netdata_last = 0;                      // milliseconds - the last timestamp in netdata
+            that.requested_after = null;                // milliseconds - the timestamp of the request after param
+            that.requested_before = null;               // milliseconds - the timestamp of the request before param
+            that.requested_padding = null;
+            that.view_after = 0;
+            that.view_before = 0;
+
+            that.refresh_dt_ms = 0;                     // milliseconds - the time the last refresh took
+
+            // how many retries we have made to load chart data from the server
+            that.retries_on_data_failures = 0;
+
+            // color management
+            that.colors = null;
+            that.colors_assigned = null;
+            that.colors_available = null;
+            that.colors_custom = null;
+
+            that.element_message = null; // the element already created by the user
+            that.element_chart = null; // the element with the chart
+            that.element_legend = null; // the element with the legend of the chart (if created by us)
+            that.element_legend_childs = {
+                content: null,
+                hidden: null,
+                title_date: null,
+                title_time: null,
+                title_units: null,
+                perfect_scroller: null, // the container to apply perfect scroller to
+                series: null
+            };
+
+            that.chart_url = null;                      // string - the url to download chart info
+            that.chart = null;                          // object - the chart as downloaded from the server
+
+            function get_foreign_element_by_id(opt) {
+                var id = NETDATA.dataAttribute(that.element, opt, null);
+                if(id === null) {
+                    //that.log('option "' + opt + '" is undefined');
+                    return null;
+                }
+
+                var el = document.getElementById(id);
+                if(typeof el === 'undefined') {
+                    that.log('cannot find an element with name "' + id.toString() + '"');
+                    return null;
+                }
+
+                return el;
+            }
+
+            that.foreign_element_before = get_foreign_element_by_id('show-before-at');
+            that.foreign_element_after = get_foreign_element_by_id('show-after-at');
+            that.foreign_element_duration = get_foreign_element_by_id('show-duration-at');
+            that.foreign_element_update_every = get_foreign_element_by_id('show-update-every-at');
+            that.foreign_element_selection = get_foreign_element_by_id('show-selection-at');
+        };
+
+        var destroyDOM = function() {
+            if(that.enabled === false) return;
+
+            if(that.debug === true)
+                that.log('destroyDOM()');
+
+            // that.element.className = 'netdata-message icon';
+            // that.element.innerHTML = '<i class="fas fa-sync"></i> netdata';
+            that.element.innerHTML = '';
+            that.element_message = null;
+            that.element_legend = null;
+            that.element_chart = null;
+            that.element_legend_childs.series = null;
+
+            that.chart_created = false;
+            that.dom_created = false;
+
+            that.tm.last_resized = 0;
+            that.tm.last_dom_created = 0;
+        };
+
+        var createDOM = function() {
+            if(that.enabled === false) return;
+            lateInitialization();
+
+            destroyDOM();
+
+            if(that.debug === true)
+                that.log('createDOM()');
+
+            that.element_message = document.createElement('div');
+            that.element_message.className = 'netdata-message icon hidden';
+            that.element.appendChild(that.element_message);
+
+            that.dom_created = true;
+            that.chart_created = false;
+
+            that.tm.last_dom_created =
+                that.tm.last_resized = Date.now();
+
+            showLoading();
+        };
+
+        var initDOM = function() {
+            that.element.className = that.library.container_class(that);
+
+            if(typeof(that.width) === 'string')
+                that.element.style.width = that.width;
+            else if(typeof(that.width) === 'number')
+                that.element.style.width = that.width.toString() + 'px';
+
+            if(typeof(that.library.aspect_ratio) === 'undefined') {
+                if(typeof(that.height) === 'string')
+                    that.element.style.height = that.height;
+                else if(typeof(that.height) === 'number')
+                    that.element.style.height = that.height.toString() + 'px';
+            }
+
+            if(NETDATA.chartDefaults.min_width !== null)
+                that.element.style.min_width = NETDATA.chartDefaults.min_width;
+        };
+
+        var invisibleSearchableText = function() {
+            return '<span style="position:absolute; opacity: 0; width: 0px;">' + that.id + '</span>';
+        };
+
+        /* init() private
+         * initialize state variables
+         * destroy all (possibly) created state elements
+         * create the basic DOM for a chart
+         */
+        var init = function(opt) {
+            if(that.enabled === false) return;
+
+            runtimeInit();
+            that.element.innerHTML = invisibleSearchableText();
+
+            that.tm.last_initialized = Date.now();
+            that.setMode('auto');
+
+            if(opt !== 'fast') {
+                if (that.isVisible(true) || opt === 'force')
+                    createDOM();
+            }
+        };
+
+        var maxMessageFontSize = function() {
+            var screenHeight = screen.height;
+            var el = that.element;
+
+            // normally we want a font size, as tall as the element
+            var h = el.clientHeight;
+
+            // but give it some air, 20% let's say, or 5 pixels min
+            var lost = Math.max(h * 0.2, 5);
+            h -= lost;
+
+            // center the text, vertically
+            var paddingTop = (lost - 5) / 2;
+
+            // but check the width too
+            // it should fit 10 characters in it
+            var w = el.clientWidth / 10;
+            if(h > w) {
+                paddingTop += (h - w) / 2;
+                h = w;
+            }
+
+            // and don't make it too huge
+            // 5% of the screen size is good
+            if(h > screenHeight / 20) {
+                paddingTop += (h - (screenHeight / 20)) / 2;
+                h = screenHeight / 20;
+            }
+
+            // set it
+            that.element_message.style.fontSize = h.toString() + 'px';
+            that.element_message.style.paddingTop = paddingTop.toString() + 'px';
+        };
+
+        var showMessageIcon = function(icon) {
+            that.element_message.innerHTML = icon;
+            maxMessageFontSize();
+            $(that.element_message).removeClass('hidden');
+            that.tmp.___messageHidden___ = undefined;
+        };
+
+        var hideMessage = function() {
+            if(typeof that.tmp.___messageHidden___ === 'undefined') {
+                that.tmp.___messageHidden___ = true;
+                $(that.element_message).addClass('hidden');
+            }
+        };
+
+        var showRendering = function() {
+            var icon;
+            if(that.chart !== null) {
+                if(that.chart.chart_type === 'line')
+                    icon = NETDATA.icons.lineChart;
+                else
+                    icon = NETDATA.icons.areaChart;
+            }
+            else
+                icon = NETDATA.icons.noChart;
+
+            showMessageIcon(icon + ' netdata' + invisibleSearchableText());
+        };
+
+        var showLoading = function() {
+            if(that.chart_created === false) {
+                showMessageIcon(NETDATA.icons.loading + ' netdata');
+                return true;
+            }
+            return false;
+        };
+
+        var isHidden = function() {
+            return (typeof that.tmp.___chartIsHidden___ !== 'undefined');
+        };
+
+        // hide the chart, when it is not visible - called from isVisible()
+        this.hideChart = function() {
+            // hide it, if it is not already hidden
+            if(isHidden() === true) return;
+
+            if(this.chart_created === true) {
+                if(NETDATA.options.current.show_help === true) {
+                    if(this.element_legend_childs.toolbox !== null) {
+                        if(this.debug === true)
+                            this.log('hideChart(): hidding legend popovers');
+
+                        $(this.element_legend_childs.toolbox_left).popover('hide');
+                        $(this.element_legend_childs.toolbox_reset).popover('hide');
+                        $(this.element_legend_childs.toolbox_right).popover('hide');
+                        $(this.element_legend_childs.toolbox_zoomin).popover('hide');
+                        $(this.element_legend_childs.toolbox_zoomout).popover('hide');
+                    }
+
+                    if(this.element_legend_childs.resize_handler !== null)
+                        $(this.element_legend_childs.resize_handler).popover('hide');
+
+                    if(this.element_legend_childs.content !== null)
+                        $(this.element_legend_childs.content).popover('hide');
+                }
+
+                if(NETDATA.options.current.destroy_on_hide === true) {
+                    if(this.debug === true)
+                        this.log('hideChart(): initializing chart');
+
+                    // we should destroy it
+                    init('force');
+                }
+                else {
+                    if(this.debug === true)
+                        this.log('hideChart(): hiding chart');
+
+                    showRendering();
+                    this.element_chart.style.display = 'none';
+                    this.element.style.willChange = 'auto';
+                    if(this.element_legend !== null) this.element_legend.style.display = 'none';
+                    if(this.element_legend_childs.toolbox !== null) this.element_legend_childs.toolbox.style.display = 'none';
+                    if(this.element_legend_childs.resize_handler !== null) this.element_legend_childs.resize_handler.style.display = 'none';
+
+                    this.tm.last_hidden = Date.now();
+
+                    // de-allocate data
+                    // This works, but I not sure there are no corner cases somewhere
+                    // so it is commented - if the user has memory issues he can
+                    // set Destroy on Hide for all charts
+                    // this.data = null;
+                }
+            }
+
+            this.tmp.___chartIsHidden___ = true;
+        };
+
+        // unhide the chart, when it is visible - called from isVisible()
+        this.unhideChart = function() {
+            if(isHidden() === false) return;
+
+            this.tmp.___chartIsHidden___ = undefined;
+            this.updates_since_last_unhide = 0;
+
+            if(this.chart_created === false) {
+                if(this.debug === true)
+                    this.log('unhideChart(): initializing chart');
+
+                // we need to re-initialize it, to show our background
+                // logo in bootstrap tabs, until the chart loads
+                init('force');
+            }
+            else {
+                if(this.debug === true)
+                    this.log('unhideChart(): unhiding chart');
+
+                this.element.style.willChange = 'transform';
+                this.tm.last_unhidden = Date.now();
+                this.element_chart.style.display = '';
+                if(this.element_legend !== null) this.element_legend.style.display = '';
+                if(this.element_legend_childs.toolbox !== null) this.element_legend_childs.toolbox.style.display = '';
+                if(this.element_legend_childs.resize_handler !== null) this.element_legend_childs.resize_handler.style.display = '';
+                resizeChart();
+                hideMessage();
+            }
+
+            if(this.__redraw_on_unhide === true) {
+
+                if(this.debug === true)
+                    this.log("redrawing chart on unhide");
+
+                this.__redraw_on_unhide = undefined;
+                this.redrawChart();
+            }
+        };
+
+        var canBeRendered = function(uncached_visibility) {
+            if(that.debug === true)
+                that.log('canBeRendered() called');
+
+            if(NETDATA.options.current.update_only_visible === false)
+                return true;
+
+            var ret = (
+                (
+                    NETDATA.options.page_is_visible === true ||
+                    NETDATA.options.current.stop_updates_when_focus_is_lost === false ||
+                    that.updates_since_last_unhide === 0
+                )
+                && isHidden() === false && that.isVisible(uncached_visibility) === true
+            );
+
+            if(that.debug === true)
+                that.log('canBeRendered(): ' + ret);
+
+            return ret;
+        };
+
+        // https://github.com/petkaantonov/bluebird/wiki/Optimization-killers
+        var callChartLibraryUpdateSafely = function(data) {
+            var status;
+
+            // we should not do this here
+            // if we prevent rendering the chart then:
+            // 1. globalSelectionSync will be wrong
+            // 2. globalPanAndZoom will be wrong
+            //if(canBeRendered(true) === false)
+            //    return false;
+
+            if(NETDATA.options.fake_chart_rendering === true)
+                return true;
+
+            that.updates_counter++;
+            that.updates_since_last_unhide++;
+            that.updates_since_last_creation++;
+
+            if(NETDATA.options.debug.chart_errors === true)
+                status = that.library.update(that, data);
+            else {
+                try {
+                    status = that.library.update(that, data);
+                }
+                catch(err) {
+                    status = false;
+                }
+            }
+
+            if(status === false) {
+                error('chart failed to be updated as ' + that.library_name);
+                return false;
+            }
+
+            return true;
+        };
+
+        // https://github.com/petkaantonov/bluebird/wiki/Optimization-killers
+        var callChartLibraryCreateSafely = function(data) {
+            var status;
+
+            // we should not do this here
+            // if we prevent rendering the chart then:
+            // 1. globalSelectionSync will be wrong
+            // 2. globalPanAndZoom will be wrong
+            //if(canBeRendered(true) === false)
+            //    return false;
+
+            if(NETDATA.options.fake_chart_rendering === true)
+                return true;
+
+            that.updates_counter++;
+            that.updates_since_last_unhide++;
+            that.updates_since_last_creation++;
+
+            if(NETDATA.options.debug.chart_errors === true)
+                status = that.library.create(that, data);
+            else {
+                try {
+                    status = that.library.create(that, data);
+                }
+                catch(err) {
+                    status = false;
+                }
+            }
+
+            if(status === false) {
+                error('chart failed to be created as ' + that.library_name);
+                return false;
+            }
+
+            that.chart_created = true;
+            that.updates_since_last_creation = 0;
+            return true;
+        };
+
+        // ----------------------------------------------------------------------------------------------------------------
+        // Chart Resize
+
+        // resizeChart() - private
+        // to be called just before the chart library to make sure that
+        // a properly sized dom is available
+        var resizeChart = function() {
+            if(that.tm.last_resized < NETDATA.options.last_page_resize) {
+                if(that.chart_created === false) return;
+
+                if(that.needsRecreation()) {
+                    if(that.debug === true)
+                        that.log('resizeChart(): initializing chart');
+
+                    init('force');
+                }
+                else if(typeof that.library.resize === 'function') {
+                    if(that.debug === true)
+                        that.log('resizeChart(): resizing chart');
+
+                    that.library.resize(that);
+
+                    if(that.element_legend_childs.perfect_scroller !== null)
+                        Ps.update(that.element_legend_childs.perfect_scroller);
+
+                    maxMessageFontSize();
+                }
+
+                that.tm.last_resized = Date.now();
+            }
+        };
+
+        // this is the actual chart resize algorithm
+        // it will:
+        // - resize the entire container
+        // - update the internal states
+        // - resize the chart as the div changes height
+        // - update the scrollbar of the legend
+        var resizeChartToHeight = function(h) {
+            // console.log(h);
+            that.element.style.height = h;
+
+            if(that.settings_id !== null)
+                NETDATA.localStorageSet('chart_heights.' + that.settings_id, h);
+
+            var now = Date.now();
+            NETDATA.options.last_page_scroll = now;
+            NETDATA.options.auto_refresher_stop_until = now + NETDATA.options.current.stop_updates_while_resizing;
+
+            // force a resize
+            that.tm.last_resized = 0;
+            resizeChart();
+        };
+
+        this.resizeForPrint = function() {
+            if(typeof this.element_legend_childs !== 'undefined' && this.element_legend_childs.perfect_scroller !== null) {
+                var current = this.element.clientHeight;
+                var optimal = current
+                    + this.element_legend_childs.perfect_scroller.scrollHeight
+                    - this.element_legend_childs.perfect_scroller.clientHeight;
+
+                if(optimal > current) {
+                    // this.log('resized');
+                    this.element.style.height = optimal + 'px';
+                    this.library.resize(this);
+                }
+            }
+        };
+
+        this.resizeHandler = function(e) {
+            e.preventDefault();
+
+            if(typeof this.event_resize === 'undefined'
+                || this.event_resize.chart_original_w === 'undefined'
+                || this.event_resize.chart_original_h === 'undefined')
+                this.event_resize = {
+                    chart_original_w: this.element.clientWidth,
+                    chart_original_h: this.element.clientHeight,
+                    last: 0
+                };
+
+            if(e.type === 'touchstart') {
+                this.event_resize.mouse_start_x = e.touches.item(0).pageX;
+                this.event_resize.mouse_start_y = e.touches.item(0).pageY;
+            }
+            else {
+                this.event_resize.mouse_start_x = e.clientX;
+                this.event_resize.mouse_start_y = e.clientY;
+            }
+
+            this.event_resize.chart_start_w = this.element.clientWidth;
+            this.event_resize.chart_start_h = this.element.clientHeight;
+            this.event_resize.chart_last_w = this.element.clientWidth;
+            this.event_resize.chart_last_h = this.element.clientHeight;
+
+            var now = Date.now();
+            if(now - this.event_resize.last <= NETDATA.options.current.double_click_speed && this.element_legend_childs.perfect_scroller !== null) {
+                // double click / double tap event
+
+                // console.dir(this.element_legend_childs.content);
+                // console.dir(this.element_legend_childs.perfect_scroller);
+
+                // the optimal height of the chart
+                // showing the entire legend
+                var optimal = this.event_resize.chart_last_h
+                        + this.element_legend_childs.perfect_scroller.scrollHeight
+                        - this.element_legend_childs.perfect_scroller.clientHeight;
+
+                // if we are not optimal, be optimal
+                if(this.event_resize.chart_last_h !== optimal) {
+                    // this.log('resize to optimal, current = ' + this.event_resize.chart_last_h.toString() + 'px, original = ' + this.event_resize.chart_original_h.toString() + 'px, optimal = ' + optimal.toString() + 'px, internal = ' + this.height_original.toString());
+                    resizeChartToHeight(optimal.toString() + 'px');
+                }
+
+                // else if the current height is not the original/saved height
+                // reset to the original/saved height
+                else if(this.event_resize.chart_last_h !== this.event_resize.chart_original_h) {
+                    // this.log('resize to original, current = ' + this.event_resize.chart_last_h.toString() + 'px, original = ' + this.event_resize.chart_original_h.toString() + 'px, optimal = ' + optimal.toString() + 'px, internal = ' + this.height_original.toString());
+                    resizeChartToHeight(this.event_resize.chart_original_h.toString() + 'px');
+                }
+
+                // else if the current height is not the internal default height
+                // reset to the internal default height
+                else if((this.event_resize.chart_last_h.toString() + 'px') !== this.height_original) {
+                    // this.log('resize to internal default, current = ' + this.event_resize.chart_last_h.toString() + 'px, original = ' + this.event_resize.chart_original_h.toString() + 'px, optimal = ' + optimal.toString() + 'px, internal = ' + this.height_original.toString());
+                    resizeChartToHeight(this.height_original.toString());
+                }
+
+                // else if the current height is not the firstchild's clientheight
+                // resize to it
+                else if(typeof this.element_legend_childs.perfect_scroller.firstChild !== 'undefined') {
+                    var parent_rect = this.element.getBoundingClientRect();
+                    var content_rect = this.element_legend_childs.perfect_scroller.firstElementChild.getBoundingClientRect();
+                    var wanted = content_rect.top - parent_rect.top + this.element_legend_childs.perfect_scroller.firstChild.clientHeight + 18; // 15 = toolbox + 3 space
+
+                    // console.log(parent_rect);
+                    // console.log(content_rect);
+                    // console.log(wanted);
+
+                    // this.log('resize to firstChild, current = ' + this.event_resize.chart_last_h.toString() + 'px, original = ' + this.event_resize.chart_original_h.toString() + 'px, optimal = ' + optimal.toString() + 'px, internal = ' + this.height_original.toString() + 'px, firstChild = ' + wanted.toString() + 'px' );
+                    if(this.event_resize.chart_last_h !== wanted)
+                        resizeChartToHeight(wanted.toString() + 'px');
+                }
+            }
+            else {
+                this.event_resize.last = now;
+
+                // process movement event
+                document.onmousemove =
+                document.ontouchmove =
+                this.element_legend_childs.resize_handler.onmousemove =
+                this.element_legend_childs.resize_handler.ontouchmove =
+                    function(e) {
+                        var y = null;
+
+                        switch(e.type) {
+                            case 'mousemove': y = e.clientY; break;
+                            case 'touchmove': y = e.touches.item(e.touches - 1).pageY; break;
+                        }
+
+                        if(y !== null) {
+                            var newH = that.event_resize.chart_start_h + y - that.event_resize.mouse_start_y;
+
+                            if(newH >= 70 && newH !== that.event_resize.chart_last_h) {
+                                resizeChartToHeight(newH.toString() + 'px');
+                                that.event_resize.chart_last_h = newH;
+                            }
+                        }
+                    };
+
+                // process end event
+                document.onmouseup =
+                document.ontouchend =
+                this.element_legend_childs.resize_handler.onmouseup =
+                this.element_legend_childs.resize_handler.ontouchend =
+                    function(e) {
+                        void(e);
+
+                        // remove all the hooks
+                        document.onmouseup =
+                        document.onmousemove =
+                        document.ontouchmove =
+                        document.ontouchend =
+                        that.element_legend_childs.resize_handler.onmousemove =
+                        that.element_legend_childs.resize_handler.ontouchmove =
+                        that.element_legend_childs.resize_handler.onmouseout =
+                        that.element_legend_childs.resize_handler.onmouseup =
+                        that.element_legend_childs.resize_handler.ontouchend =
+                            null;
+
+                        // allow auto-refreshes
+                        NETDATA.options.auto_refresher_stop_until = 0;
+                    };
+            }
+        };
+
+
+        var noDataToShow = function() {
+            showMessageIcon(NETDATA.icons.noData + ' empty');
+            that.legendUpdateDOM();
+            that.tm.last_autorefreshed = Date.now();
+            // that.data_update_every = 30 * 1000;
+            //that.element_chart.style.display = 'none';
+            //if(that.element_legend !== null) that.element_legend.style.display = 'none';
+            //that.tmp.___chartIsHidden___ = true;
+        };
+
+        // ============================================================================================================
+        // PUBLIC FUNCTIONS
+
+        this.error = function(msg) {
+            error(msg);
+        };
+
+        this.setMode = function(m) {
+            if(this.current !== null && this.current.name === m) return;
+
+            if(m === 'auto')
+                this.current = this.auto;
+            else if(m === 'pan')
+                this.current = this.pan;
+            else if(m === 'zoom')
+                this.current = this.zoom;
+            else
+                this.current = this.auto;
+
+            this.current.force_update_at = 0;
+            this.current.force_before_ms = null;
+            this.current.force_after_ms = null;
+
+            this.tm.last_mode_switch = Date.now();
+        };
+
+        // ----------------------------------------------------------------------------------------------------------------
+        // global selection sync for slaves
+
+        // can the chart participate to the global selection sync as a slave?
+        this.globalSelectionSyncIsEligible = function() {
+            return (this.enabled === true
+                && this.library !== null
+                && typeof this.library.setSelection === 'function'
+                && this.isVisible() === true
+                && this.chart_created === true);
+        };
+
+        this.setSelection = function(t) {
+            if(typeof this.library.setSelection === 'function')
+                this.selected = (this.library.setSelection(this, t) === true);
+            else
+                this.selected = true;
+
+            if(this.selected === true && this.debug === true)
+                this.log('selection set to ' + t.toString());
+
+            if (this.foreign_element_selection !== null)
+                this.foreign_element_selection.innerText = NETDATA.dateTime.localeDateString(t) + ' ' + NETDATA.dateTime.localeTimeString(t);
+
+            return this.selected;
+        };
+
+        this.clearSelection = function() {
+            if(this.selected === true) {
+                if(typeof this.library.clearSelection === 'function')
+                    this.selected = (this.library.clearSelection(this) !== true);
+                else
+                    this.selected = false;
+
+                if(this.selected === false && this.debug === true)
+                    this.log('selection cleared');
+
+                if (this.foreign_element_selection !== null)
+                    this.foreign_element_selection.innerText = '';
+
+                this.legendReset();
+            }
+
+            return this.selected;
+        };
+
+        // ----------------------------------------------------------------------------------------------------------------
+
+        // find if a timestamp (ms) is shown in the current chart
+        this.timeIsVisible = function(t) {
+            return (t >= this.data_after && t <= this.data_before);
+        };
+
+        this.calculateRowForTime = function(t) {
+            if(this.timeIsVisible(t) === false) return -1;
+            return Math.floor((t - this.data_after) / this.data_update_every);
+        };
+
+        // ----------------------------------------------------------------------------------------------------------------
+
+        this.pauseChart = function() {
+            if(this.paused === false) {
+                if(this.debug === true)
+                    this.log('pauseChart()');
+
+                this.paused = true;
+            }
+        };
+
+        this.unpauseChart = function() {
+            if(this.paused === true) {
+                if(this.debug === true)
+                    this.log('unpauseChart()');
+
+                this.paused = false;
+            }
+        };
+
+        this.resetChart = function(dont_clear_master, dont_update) {
+            if(this.debug === true)
+                this.log('resetChart(' + dont_clear_master + ', ' + dont_update + ') called');
+
+            if(typeof dont_clear_master === 'undefined')
+                dont_clear_master = false;
+
+            if(typeof dont_update === 'undefined')
+                dont_update = false;
+
+            if(dont_clear_master !== true && NETDATA.globalPanAndZoom.isMaster(this) === true) {
+                if(this.debug === true)
+                    this.log('resetChart() diverting to clearMaster().');
+                // this will call us back with master === true
+                NETDATA.globalPanAndZoom.clearMaster();
+                return;
+            }
+
+            this.clearSelection();
+
+            this.tm.pan_and_zoom_seq = 0;
+
+            this.setMode('auto');
+            this.current.force_update_at = 0;
+            this.current.force_before_ms = null;
+            this.current.force_after_ms = null;
+            this.tm.last_autorefreshed = 0;
+            this.paused = false;
+            this.selected = false;
+            this.enabled = true;
+            // this.debug = false;
+
+            // do not update the chart here
+            // or the chart will flip-flop when it is the master
+            // of a selection sync and another chart becomes
+            // the new master
+
+            if(dont_update !== true && this.isVisible() === true) {
+                this.updateChart();
+            }
+        };
+
+        this.updateChartPanOrZoom = function(after, before, callback) {
+            var logme = 'updateChartPanOrZoom(' + after + ', ' + before + '): ';
+            var ret = true;
+
+            NETDATA.globalPanAndZoom.delay();
+            NETDATA.globalSelectionSync.delay();
+
+            if(this.debug === true)
+                this.log(logme);
+
+            if(before < after) {
+                if(this.debug === true)
+                    this.log(logme + 'flipped parameters, rejecting it.');
+
+                return false;
+            }
+
+            if(typeof this.fixed_min_duration === 'undefined')
+                this.fixed_min_duration = Math.round((this.chartWidth() / 30) * this.chart.update_every * 1000);
+
+            var min_duration = this.fixed_min_duration;
+            var current_duration = Math.round(this.view_before - this.view_after);
+
+            // round the numbers
+            after = Math.round(after);
+            before = Math.round(before);
+
+            // align them to update_every
+            // stretching them further away
+            after -= after % this.data_update_every;
+            before += this.data_update_every - (before % this.data_update_every);
+
+            // the final wanted duration
+            var wanted_duration = before - after;
+
+            // to allow panning, accept just a point below our minimum
+            if((current_duration - this.data_update_every) < min_duration)
+                min_duration = current_duration - this.data_update_every;
+
+            // we do it, but we adjust to minimum size and return false
+            // when the wanted size is below the current and the minimum
+            // and we zoom
+            if(wanted_duration < current_duration && wanted_duration < min_duration) {
+                if(this.debug === true)
+                    this.log(logme + 'too small: min_duration: ' + (min_duration / 1000).toString() + ', wanted: ' + (wanted_duration / 1000).toString());
+
+                min_duration = this.fixed_min_duration;
+
+                var dt = (min_duration - wanted_duration) / 2;
+                before += dt;
+                after -= dt;
+                wanted_duration = before - after;
+                ret = false;
+            }
+
+            var tolerance = this.data_update_every * 2;
+            var movement = Math.abs(before - this.view_before);
+
+            if(Math.abs(current_duration - wanted_duration) <= tolerance && movement <= tolerance && ret === true) {
+                if(this.debug === true)
+                    this.log(logme + 'REJECTING UPDATE: current/min duration: ' + (current_duration / 1000).toString() + '/' + (this.fixed_min_duration / 1000).toString() + ', wanted duration: ' + (wanted_duration / 1000).toString() + ', duration diff: ' + (Math.round(Math.abs(current_duration - wanted_duration) / 1000)).toString() + ', movement: ' + (movement / 1000).toString() + ', tolerance: ' + (tolerance / 1000).toString() + ', returning: ' + false);
+                return false;
+            }
+
+            if(this.current.name === 'auto') {
+                this.log(logme + 'caller called me with mode: ' + this.current.name);
+                this.setMode('pan');
+            }
+
+            if(this.debug === true)
+                this.log(logme + 'ACCEPTING UPDATE: current/min duration: ' + (current_duration / 1000).toString() + '/' + (this.fixed_min_duration / 1000).toString() + ', wanted duration: ' + (wanted_duration / 1000).toString() + ', duration diff: ' + (Math.round(Math.abs(current_duration - wanted_duration) / 1000)).toString() + ', movement: ' + (movement / 1000).toString() + ', tolerance: ' + (tolerance / 1000).toString() + ', returning: ' + ret);
+
+            this.current.force_update_at = Date.now() + NETDATA.options.current.pan_and_zoom_delay;
+            this.current.force_after_ms = after;
+            this.current.force_before_ms = before;
+            NETDATA.globalPanAndZoom.setMaster(this, after, before);
+
+            if(ret === true && typeof callback === 'function')
+                callback();
+
+            return ret;
+        };
+
+        this.updateChartPanOrZoomAsyncTimeOutId = undefined;
+        this.updateChartPanOrZoomAsync = function(after, before, callback) {
+            NETDATA.globalPanAndZoom.delay();
+            NETDATA.globalSelectionSync.delay();
+
+            if(NETDATA.globalPanAndZoom.isMaster(this) === false) {
+                this.pauseChart();
+                NETDATA.globalPanAndZoom.setMaster(this, after, before);
+                // NETDATA.globalSelectionSync.stop();
+                NETDATA.globalSelectionSync.setMaster(this);
+            }
+
+            if(this.updateChartPanOrZoomAsyncTimeOutId)
+                NETDATA.timeout.clear(this.updateChartPanOrZoomAsyncTimeOutId);
+
+            NETDATA.timeout.set(function() {
+                that.updateChartPanOrZoomAsyncTimeOutId = undefined;
+                that.updateChartPanOrZoom(after, before, callback);
+            }, 0);
+        };
+
+        var __unitsConversionLastUnits = undefined;
+        var __unitsConversionLastUnitsDesired = undefined;
+        var __unitsConversionLastMin = undefined;
+        var __unitsConversionLastMax = undefined;
+        var __unitsConversion = function(value) { return value; };
+        this.unitsConversionSetup = function(min, max) {
+            if(this.units !== __unitsConversionLastUnits
+                || this.units_desired !== __unitsConversionLastUnitsDesired
+                || min !== __unitsConversionLastMin
+                || max !== __unitsConversionLastMax) {
+
+                __unitsConversionLastUnits = this.units;
+                __unitsConversionLastUnitsDesired = this.units_desired;
+                __unitsConversionLastMin = min;
+                __unitsConversionLastMax = max;
+
+                __unitsConversion = NETDATA.unitsConversion.get(this.uuid, min, max, this.units, this.units_desired, this.units_common, function (units) {
+                    // console.log('switching units from ' + that.units.toString() + ' to ' + units.toString());
+                    that.units_current = units;
+                    that.legendSetUnitsString(that.units_current);
+                });
+            }
+        };
+
+        var __legendFormatValueChartDecimalsLastMin = undefined;
+        var __legendFormatValueChartDecimalsLastMax = undefined;
+        var __legendFormatValueChartDecimals = -1;
+        var __intlNumberFormat = null;
+        this.legendFormatValueDecimalsFromMinMax = function(min, max) {
+            if(min === __legendFormatValueChartDecimalsLastMin && max === __legendFormatValueChartDecimalsLastMax)
+                return;
+
+            this.unitsConversionSetup(min, max);
+            if(__unitsConversion !== null) {
+                min = __unitsConversion(min);
+                max = __unitsConversion(max);
+
+                if(typeof min !== 'number' || typeof max !== 'number')
+                    return;
+            }
+
+            __legendFormatValueChartDecimalsLastMin = min;
+            __legendFormatValueChartDecimalsLastMax = max;
+
+            var old = __legendFormatValueChartDecimals;
+
+            if(this.data !== null && this.data.min === this.data.max)
+                // it is a fixed number, let the visualizer decide based on the value
+                __legendFormatValueChartDecimals = -1;
+
+            else if(this.value_decimal_detail !== -1)
+                // there is an override
+                __legendFormatValueChartDecimals = this.value_decimal_detail;
+
+            else {
+                // ok, let's calculate the proper number of decimal points
+                var delta;
+
+                if (min === max)
+                    delta = Math.abs(min);
+                else
+                    delta = Math.abs(max - min);
+
+                if (delta > 1000)        __legendFormatValueChartDecimals = 0;
+                else if (delta > 10)     __legendFormatValueChartDecimals = 1;
+                else if (delta > 1)      __legendFormatValueChartDecimals = 2;
+                else if (delta > 0.1)    __legendFormatValueChartDecimals = 2;
+                else if (delta > 0.01)   __legendFormatValueChartDecimals = 4;
+                else if (delta > 0.001)  __legendFormatValueChartDecimals = 5;
+                else if (delta > 0.0001) __legendFormatValueChartDecimals = 6;
+                else                     __legendFormatValueChartDecimals = 7;
+            }
+
+            if(__legendFormatValueChartDecimals !== old) {
+                if(__legendFormatValueChartDecimals < 0)
+                    __intlNumberFormat = null;
+                else
+                    __intlNumberFormat = NETDATA.fastNumberFormat.get(
+                        __legendFormatValueChartDecimals,
+                        __legendFormatValueChartDecimals
+                    );
+            }
+        };
+
+        this.legendFormatValue = function(value) {
+            if(typeof value !== 'number')
+                return '-';
+
+            value = __unitsConversion(value);
+
+            if(typeof value !== 'number')
+                return value;
+
+            if(__intlNumberFormat !== null)
+                return __intlNumberFormat.format(value);
+
+            var dmin, dmax;
+            if(this.value_decimal_detail !== -1) {
+                dmin = dmax = this.value_decimal_detail;
+            }
+            else {
+                dmin = 0;
+                var abs = (value < 0) ? -value : value;
+                if (abs > 1000)        dmax = 0;
+                else if (abs > 10)     dmax = 1;
+                else if (abs > 1)      dmax = 2;
+                else if (abs > 0.1)    dmax = 2;
+                else if (abs > 0.01)   dmax = 4;
+                else if (abs > 0.001)  dmax = 5;
+                else if (abs > 0.0001) dmax = 6;
+                else                   dmax = 7;
+            }
+
+            return NETDATA.fastNumberFormat.get(dmin, dmax).format(value);
+        };
+
+        this.legendSetLabelValue = function(label, value) {
+            var series = this.element_legend_childs.series[label];
+            if(typeof series === 'undefined') return;
+            if(series.value === null && series.user === null) return;
+
+            /*
+            // this slows down firefox and edge significantly
+            // since it requires to use innerHTML(), instead of innerText()
+
+            // if the value has not changed, skip DOM update
+            //if(series.last === value) return;
+
+            var s, r;
+            if(typeof value === 'number') {
+                var v = Math.abs(value);
+                s = r = this.legendFormatValue(value);
+
+                if(typeof series.last === 'number') {
+                    if(v > series.last) s += '<i class="fas fa-angle-up" style="width: 8px; text-align: center; overflow: hidden; vertical-align: middle;"></i>';
+                    else if(v < series.last) s += '<i class="fas fa-angle-down" style="width: 8px; text-align: center; overflow: hidden; vertical-align: middle;"></i>';
+                    else s += '<i class="fas fa-angle-left" style="width: 8px; text-align: center; overflow: hidden; vertical-align: middle;"></i>';
+                }
+                else s += '<i class="fas fa-angle-right" style="width: 8px; text-align: center; overflow: hidden; vertical-align: middle;"></i>';
+
+                series.last = v;
+            }
+            else {
+                if(value === null)
+                    s = r = '';
+                else
+                    s = r = value;
+
+                series.last = value;
+            }
+            */
+
+            var s = this.legendFormatValue(value);
+
+            // caching: do not update the update to show the same value again
+            if(s === series.last_shown_value) return;
+            series.last_shown_value = s;
+
+            if(series.value !== null) series.value.innerText = s;
+            if(series.user !== null) series.user.innerText = s;
+        };
+
+        this.legendSetDateString = function(date) {
+            if(this.element_legend_childs.title_date !== null && date !== this.tmp.__last_shown_legend_date) {
+                this.element_legend_childs.title_date.innerText = date;
+                this.tmp.__last_shown_legend_date = date;
+            }
+        };
+
+        this.legendSetTimeString = function(time) {
+            if(this.element_legend_childs.title_time !== null && time !== this.tmp.__last_shown_legend_time) {
+                this.element_legend_childs.title_time.innerText = time;
+                this.tmp.__last_shown_legend_time = time;
+            }
+        };
+
+        this.legendSetUnitsString = function(units) {
+            if(this.element_legend_childs.title_units !== null && units !== this.tmp.__last_shown_legend_units) {
+                this.element_legend_childs.title_units.innerText = units;
+                this.tmp.__last_shown_legend_units = units;
+            }
+        };
+
+        this.legendSetDateLast = {
+            ms: 0,
+            date: undefined,
+            time: undefined
+        };
+
+        this.legendSetDate = function(ms) {
+            if(typeof ms !== 'number') {
+                this.legendShowUndefined();
+                return;
+            }
+
+            if(this.legendSetDateLast.ms !== ms) {
+                var d = new Date(ms);
+                this.legendSetDateLast.ms = ms;
+                this.legendSetDateLast.date = NETDATA.dateTime.localeDateString(d);
+                this.legendSetDateLast.time = NETDATA.dateTime.localeTimeString(d);
+            }
+
+            this.legendSetDateString(this.legendSetDateLast.date);
+            this.legendSetTimeString(this.legendSetDateLast.time);
+            this.legendSetUnitsString(this.units_current)
+        };
+
+        this.legendShowUndefined = function() {
+            this.legendSetDateString(this.legendPluginModuleString(false));
+            this.legendSetTimeString(this.chart.context.toString());
+            // this.legendSetUnitsString(' ');
+
+            if(this.data && this.element_legend_childs.series !== null) {
+                var labels = this.data.dimension_names;
+                var i = labels.length;
+                while(i--) {
+                    var label = labels[i];
+
+                    if(typeof label === 'undefined' || typeof this.element_legend_childs.series[label] === 'undefined') continue;
+                    this.legendSetLabelValue(label, null);
+                }
+            }
+        };
+
+        this.legendShowLatestValues = function() {
+            if(this.chart === null) return;
+            if(this.selected) return;
+
+            if(this.data === null || this.element_legend_childs.series === null) {
+                this.legendShowUndefined();
+                return;
+            }
+
+            var show_undefined = true;
+            if(Math.abs(this.netdata_last - this.view_before) <= this.data_update_every)
+                show_undefined = false;
+
+            if(show_undefined) {
+                this.legendShowUndefined();
+                return;
+            }
+
+            this.legendSetDate(this.view_before);
+
+            var labels = this.data.dimension_names;
+            var i = labels.length;
+            while(i--) {
+                var label = labels[i];
+
+                if(typeof label === 'undefined') continue;
+                if(typeof this.element_legend_childs.series[label] === 'undefined') continue;
+
+                this.legendSetLabelValue(label, this.data.view_latest_values[i]);
+            }
+        };
+
+        this.legendReset = function() {
+            this.legendShowLatestValues();
+        };
+
+        // this should be called just ONCE per dimension per chart
+        this.__chartDimensionColor = function(label) {
+            var c = NETDATA.commonColors.get(this, label);
+
+            // it is important to maintain a list of colors
+            // for this chart only, since the chart library
+            // uses this to assign colors to dimensions in the same
+            // order the dimension are given to it
+            this.colors.push(c);
+
+            return c;
+        };
+
+        this.chartPrepareColorPalette = function() {
+            NETDATA.commonColors.refill(this);
+        };
+
+        // get the ordered list of chart colors
+        // this includes user defined colors
+        this.chartCustomColors = function() {
+            this.chartPrepareColorPalette();
+
+            var colors;
+            if(this.colors_custom.length)
+                colors = this.colors_custom;
+            else
+                colors = this.colors;
+
+            if(this.debug === true) {
+                this.log("chartCustomColors() returns:");
+                this.log(colors);
+            }
+
+            return colors;
+        };
+
+        // get the ordered list of chart ASSIGNED colors
+        // (this returns only the colors that have been
+        //  assigned to dimensions, prepended with any
+        // custom colors defined)
+        this.chartColors = function() {
+            this.chartPrepareColorPalette();
+
+            if(this.debug === true) {
+                this.log("chartColors() returns:");
+                this.log(this.colors);
+            }
+
+            return this.colors;
+        };
+
+        this.legendPluginModuleString = function(withContext) {
+            var str = ' ';
+            var context = '';
+
+            if(typeof this.chart !== 'undefined') {
+                if(withContext && typeof this.chart.context === 'string')
+                    context = this.chart.context;
+
+                if (typeof this.chart.plugin === 'string' && this.chart.plugin !== '') {
+                    str = this.chart.plugin;
+
+                    if(str.endsWith(".plugin"))
+                        str = str.substring(0, str.length - 7);
+
+                    if (typeof this.chart.module === 'string' && this.chart.module !== '')
+                        str += ':' + this.chart.module;
+
+                    if (withContext && context !== '')
+                        str += ', ' + context;
+                }
+                else if (withContext && context !== '')
+                    str = context;
+            }
+
+            return str;
+        };
+
+        this.legendResolutionTooltip = function () {
+            if(!this.chart) return '';
+
+            var collected = this.chart.update_every;
+            var viewed = (this.data)?this.data.view_update_every:collected;
+
+            if(collected === viewed)
+                return "resolution " + NETDATA.seconds4human(collected);
+
+            return "resolution " + NETDATA.seconds4human(viewed) + ", collected every " + NETDATA.seconds4human(collected);
+        };
+
+        this.legendUpdateDOM = function() {
+            var needed = false, dim, keys, len, i;
+
+            // check that the legend DOM is up to date for the downloaded dimensions
+            if(typeof this.element_legend_childs.series !== 'object' || this.element_legend_childs.series === null) {
+                // this.log('the legend does not have any series - requesting legend update');
+                needed = true;
+            }
+            else if(this.data === null) {
+                // this.log('the chart does not have any data - requesting legend update');
+                needed = true;
+            }
+            else if(typeof this.element_legend_childs.series.labels_key === 'undefined') {
+                needed = true;
+            }
+            else {
+                var labels = this.data.dimension_names.toString();
+                if(labels !== this.element_legend_childs.series.labels_key) {
+                    needed = true;
+
+                    if(this.debug === true)
+                        this.log('NEW LABELS: "' + labels + '" NOT EQUAL OLD LABELS: "' + this.element_legend_childs.series.labels_key + '"');
+                }
+            }
+
+            if(needed === false) {
+                // make sure colors available
+                this.chartPrepareColorPalette();
+
+                // do we have to update the current values?
+                // we do this, only when the visible chart is current
+                if(Math.abs(this.netdata_last - this.view_before) <= this.data_update_every) {
+                    if(this.debug === true)
+                        this.log('chart is in latest position... updating values on legend...');
+
+                    //var labels = this.data.dimension_names;
+                    //var i = labels.length;
+                    //while(i--)
+                    //  this.legendSetLabelValue(labels[i], this.data.view_latest_values[i]);
+                }
+                return;
+            }
+
+            if(this.colors === null) {
+                // this is the first time we update the chart
+                // let's assign colors to all dimensions
+                if(this.library.track_colors() === true) {
+                    this.colors = [];
+                    keys = Object.keys(this.chart.dimensions);
+                    len = keys.length;
+                    for(i = 0; i < len ;i++)
+                        NETDATA.commonColors.get(this, this.chart.dimensions[keys[i]].name);
+                }
+            }
+
+            // we will re-generate the colors for the chart
+            // based on the dimensions this result has data for
+            this.colors = [];
+
+            if(this.debug === true)
+                this.log('updating Legend DOM');
+
+            // mark all dimensions as invalid
+            this.dimensions_visibility.invalidateAll();
+
+            var genLabel = function(state, parent, dim, name, count) {
+                var color = state.__chartDimensionColor(name);
+
+                var user_element = null;
+                var user_id = NETDATA.dataAttribute(state.element, 'show-value-of-' + name.toLowerCase() + '-at', null);
+                if(user_id === null)
+                    user_id = NETDATA.dataAttribute(state.element, 'show-value-of-' + dim.toLowerCase() + '-at', null);
+                if(user_id !== null) {
+                    user_element = document.getElementById(user_id) || null;
+                    if (user_element === null)
+                        state.log('Cannot find element with id: ' + user_id);
+                }
+
+                state.element_legend_childs.series[name] = {
+                    name: document.createElement('span'),
+                    value: document.createElement('span'),
+                    user: user_element,
+                    last: null,
+                    last_shown_value: null
+                };
+
+                var label = state.element_legend_childs.series[name];
+
+                // create the dimension visibility tracking for this label
+                state.dimensions_visibility.dimensionAdd(name, label.name, label.value, color);
+
+                var rgb = NETDATA.colorHex2Rgb(color);
+                label.name.innerHTML = '<table class="netdata-legend-name-table-'
+                    + state.chart.chart_type
+                    + '" style="background-color: '
+                    + 'rgba(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ',' + NETDATA.options.current['color_fill_opacity_' + state.chart.chart_type] + ') !important'
+                    + '"><tr class="netdata-legend-name-tr"><td class="netdata-legend-name-td"></td></tr></table>';
+
+                var text = document.createTextNode(' ' + name);
+                label.name.appendChild(text);
+
+                if(count > 0)
+                    parent.appendChild(document.createElement('br'));
+
+                parent.appendChild(label.name);
+                parent.appendChild(label.value);
+            };
+
+            var content = document.createElement('div');
+
+            if(this.element_chart === null) {
+                this.element_chart = document.createElement('div');
+                this.element_chart.id = this.library_name + '-' + this.uuid + '-chart';
+                this.element.appendChild(this.element_chart);
+
+                if(this.hasLegend() === true)
+                    this.element_chart.className = 'netdata-chart-with-legend-right netdata-' + this.library_name + '-chart-with-legend-right';
+                else
+                    this.element_chart.className = ' netdata-chart netdata-' + this.library_name + '-chart';
+            }
+
+            if(this.hasLegend() === true) {
+                if(this.element_legend === null) {
+                    this.element_legend = document.createElement('div');
+                    this.element_legend.className = 'netdata-chart-legend netdata-' + this.library_name + '-legend';
+                    this.element.appendChild(this.element_legend);
+                }
+                else
+                    this.element_legend.innerHTML = '';
+
+                this.element_legend_childs = {
+                    content: content,
+                    resize_handler: null,
+                    toolbox: null,
+                    toolbox_left: null,
+                    toolbox_right: null,
+                    toolbox_reset: null,
+                    toolbox_zoomin: null,
+                    toolbox_zoomout: null,
+                    toolbox_volume: null,
+                    title_date: document.createElement('span'),
+                    title_time: document.createElement('span'),
+                    title_units: document.createElement('span'),
+                    perfect_scroller: document.createElement('div'),
+                    series: {}
+                };
+
+                if(NETDATA.options.current.legend_toolbox === true && this.library.toolboxPanAndZoom !== null) {
+                    this.element_legend_childs.toolbox = document.createElement('div');
+                    this.element_legend_childs.toolbox_left = document.createElement('div');
+                    this.element_legend_childs.toolbox_right = document.createElement('div');
+                    this.element_legend_childs.toolbox_reset = document.createElement('div');
+                    this.element_legend_childs.toolbox_zoomin = document.createElement('div');
+                    this.element_legend_childs.toolbox_zoomout = document.createElement('div');
+                    this.element_legend_childs.toolbox_volume = document.createElement('div');
+
+                    var get_pan_and_zoom_step = function(event) {
+                        if (event.ctrlKey)
+                            return NETDATA.options.current.pan_and_zoom_factor * NETDATA.options.current.pan_and_zoom_factor_multiplier_control;
+
+                        else if (event.shiftKey)
+                            return NETDATA.options.current.pan_and_zoom_factor * NETDATA.options.current.pan_and_zoom_factor_multiplier_shift;
+
+                        else if (event.altKey)
+                            return NETDATA.options.current.pan_and_zoom_factor * NETDATA.options.current.pan_and_zoom_factor_multiplier_alt;
+
+                        else
+                            return NETDATA.options.current.pan_and_zoom_factor;
+                    };
+
+                    this.element_legend_childs.toolbox.className += ' netdata-legend-toolbox';
+                    this.element.appendChild(this.element_legend_childs.toolbox);
+
+                    this.element_legend_childs.toolbox_left.className += ' netdata-legend-toolbox-button';
+                    this.element_legend_childs.toolbox_left.innerHTML = NETDATA.icons.left;
+                    this.element_legend_childs.toolbox.appendChild(this.element_legend_childs.toolbox_left);
+                    this.element_legend_childs.toolbox_left.onclick = function(e) {
+                        e.preventDefault();
+
+                        var step = (that.view_before - that.view_after) * get_pan_and_zoom_step(e);
+                        var before = that.view_before - step;
+                        var after = that.view_after - step;
+                        if(after >= that.netdata_first)
+                            that.library.toolboxPanAndZoom(that, after, before);
+                    };
+                    if(NETDATA.options.current.show_help === true)
+                        $(this.element_legend_childs.toolbox_left).popover({
+                        container: "body",
+                        animation: false,
+                        html: true,
+                        trigger: 'hover',
+                        placement: 'bottom',
+                        delay: { show: NETDATA.options.current.show_help_delay_show_ms, hide: NETDATA.options.current.show_help_delay_hide_ms },
+                        title: 'Pan Left',
+                        content: 'Pan the chart to the left. You can also <b>drag it</b> with your mouse or your finger (on touch devices).<br/><small>Help can be disabled from the settings.</small>'
+                    });
+
+
+                    this.element_legend_childs.toolbox_reset.className += ' netdata-legend-toolbox-button';
+                    this.element_legend_childs.toolbox_reset.innerHTML = NETDATA.icons.reset;
+                    this.element_legend_childs.toolbox.appendChild(this.element_legend_childs.toolbox_reset);
+                    this.element_legend_childs.toolbox_reset.onclick = function(e) {
+                        e.preventDefault();
+                        NETDATA.resetAllCharts(that);
+                    };
+                    if(NETDATA.options.current.show_help === true)
+                        $(this.element_legend_childs.toolbox_reset).popover({
+                        container: "body",
+                        animation: false,
+                        html: true,
+                        trigger: 'hover',
+                        placement: 'bottom',
+                        delay: { show: NETDATA.options.current.show_help_delay_show_ms, hide: NETDATA.options.current.show_help_delay_hide_ms },
+                        title: 'Chart Reset',
+                        content: 'Reset all the charts to their default auto-refreshing state. You can also <b>double click</b> the chart contents with your mouse or your finger (on touch devices).<br/><small>Help can be disabled from the settings.</small>'
+                    });
+
+                    this.element_legend_childs.toolbox_right.className += ' netdata-legend-toolbox-button';
+                    this.element_legend_childs.toolbox_right.innerHTML = NETDATA.icons.right;
+                    this.element_legend_childs.toolbox.appendChild(this.element_legend_childs.toolbox_right);
+                    this.element_legend_childs.toolbox_right.onclick = function(e) {
+                        e.preventDefault();
+                        var step = (that.view_before - that.view_after) * get_pan_and_zoom_step(e);
+                        var before = that.view_before + step;
+                        var after = that.view_after + step;
+                        if(before <= that.netdata_last)
+                            that.library.toolboxPanAndZoom(that, after, before);
+                    };
+                    if(NETDATA.options.current.show_help === true)
+                        $(this.element_legend_childs.toolbox_right).popover({
+                        container: "body",
+                        animation: false,
+                        html: true,
+                        trigger: 'hover',
+                        placement: 'bottom',
+                        delay: { show: NETDATA.options.current.show_help_delay_show_ms, hide: NETDATA.options.current.show_help_delay_hide_ms },
+                        title: 'Pan Right',
+                        content: 'Pan the chart to the right. You can also <b>drag it</b> with your mouse or your finger (on touch devices).<br/><small>Help, can be disabled from the settings.</small>'
+                    });
+
+
+                    this.element_legend_childs.toolbox_zoomin.className += ' netdata-legend-toolbox-button';
+                    this.element_legend_childs.toolbox_zoomin.innerHTML = NETDATA.icons.zoomIn;
+                    this.element_legend_childs.toolbox.appendChild(this.element_legend_childs.toolbox_zoomin);
+                    this.element_legend_childs.toolbox_zoomin.onclick = function(e) {
+                        e.preventDefault();
+                        var dt = ((that.view_before - that.view_after) * (get_pan_and_zoom_step(e) * 0.8) / 2);
+                        var before = that.view_before - dt;
+                        var after = that.view_after + dt;
+                        that.library.toolboxPanAndZoom(that, after, before);
+                    };
+                    if(NETDATA.options.current.show_help === true)
+                        $(this.element_legend_childs.toolbox_zoomin).popover({
+                        container: "body",
+                        animation: false,
+                        html: true,
+                        trigger: 'hover',
+                        placement: 'bottom',
+                        delay: { show: NETDATA.options.current.show_help_delay_show_ms, hide: NETDATA.options.current.show_help_delay_hide_ms },
+                        title: 'Chart Zoom In',
+                        content: 'Zoom in the chart. You can also press SHIFT and select an area of the chart, or press SHIFT or ALT and use the mouse wheel or 2-finger touchpad scroll to zoom in or out.<br/><small>Help, can be disabled from the settings.</small>'
+                    });
+
+                    this.element_legend_childs.toolbox_zoomout.className += ' netdata-legend-toolbox-button';
+                    this.element_legend_childs.toolbox_zoomout.innerHTML = NETDATA.icons.zoomOut;
+                    this.element_legend_childs.toolbox.appendChild(this.element_legend_childs.toolbox_zoomout);
+                    this.element_legend_childs.toolbox_zoomout.onclick = function(e) {
+                        e.preventDefault();
+                        var dt = (((that.view_before - that.view_after) / (1.0 - (get_pan_and_zoom_step(e) * 0.8)) - (that.view_before - that.view_after)) / 2);
+                        var before = that.view_before + dt;
+                        var after = that.view_after - dt;
+
+                        that.library.toolboxPanAndZoom(that, after, before);
+                    };
+                    if(NETDATA.options.current.show_help === true)
+                        $(this.element_legend_childs.toolbox_zoomout).popover({
+                        container: "body",
+                        animation: false,
+                        html: true,
+                        trigger: 'hover',
+                        placement: 'bottom',
+                        delay: { show: NETDATA.options.current.show_help_delay_show_ms, hide: NETDATA.options.current.show_help_delay_hide_ms },
+                        title: 'Chart Zoom Out',
+                        content: 'Zoom out the chart. You can also press SHIFT or ALT and use the mouse wheel, or 2-finger touchpad scroll to zoom in or out.<br/><small>Help, can be disabled from the settings.</small>'
+                    });
+
+                    //this.element_legend_childs.toolbox_volume.className += ' netdata-legend-toolbox-button';
+                    //this.element_legend_childs.toolbox_volume.innerHTML = '<i class="fas fa-sort-amount-down"></i>';
+                    //this.element_legend_childs.toolbox_volume.title = 'Visible Volume';
+                    //this.element_legend_childs.toolbox.appendChild(this.element_legend_childs.toolbox_volume);
+                    //this.element_legend_childs.toolbox_volume.onclick = function(e) {
+                        //e.preventDefault();
+                        //alert('clicked toolbox_volume on ' + that.id);
+                    //}
+                }
+
+                if(NETDATA.options.current.resize_charts === true) {
+                    this.element_legend_childs.resize_handler = document.createElement('div');
+
+                    this.element_legend_childs.resize_handler.className += " netdata-legend-resize-handler";
+                    this.element_legend_childs.resize_handler.innerHTML = NETDATA.icons.resize;
+                    this.element.appendChild(this.element_legend_childs.resize_handler);
+                    if (NETDATA.options.current.show_help === true)
+                        $(this.element_legend_childs.resize_handler).popover({
+                            container: "body",
+                            animation: false,
+                            html: true,
+                            trigger: 'hover',
+                            placement: 'bottom',
+                            delay: {
+                                show: NETDATA.options.current.show_help_delay_show_ms,
+                                hide: NETDATA.options.current.show_help_delay_hide_ms
+                            },
+                            title: 'Chart Resize',
+                            content: 'Drag this point with your mouse or your finger (on touch devices), to resize the chart vertically. You can also <b>double click it</b> or <b>double tap it</b> to reset between 2 states: the default and the one that fits all the values.<br/><small>Help, can be disabled from the settings.</small>'
+                        });
+
+                    // mousedown event
+                    this.element_legend_childs.resize_handler.onmousedown =
+                        function (e) {
+                            that.resizeHandler(e);
+                        };
+
+                    // touchstart event
+                    this.element_legend_childs.resize_handler.addEventListener('touchstart', function (e) {
+                        that.resizeHandler(e);
+                    }, false);
+                }
+
+                if(this.chart) {
+                    this.element_legend_childs.title_date.title = this.legendPluginModuleString(true);
+                    this.element_legend_childs.title_time.title = this.legendResolutionTooltip();
+                }
+
+                this.element_legend_childs.title_date.className += " netdata-legend-title-date";
+                this.element_legend.appendChild(this.element_legend_childs.title_date);
+                this.tmp.__last_shown_legend_date = undefined;
+
+                this.element_legend.appendChild(document.createElement('br'));
+
+                this.element_legend_childs.title_time.className += " netdata-legend-title-time";
+                this.element_legend.appendChild(this.element_legend_childs.title_time);
+                this.tmp.__last_shown_legend_time = undefined;
+
+                this.element_legend.appendChild(document.createElement('br'));
+
+                this.element_legend_childs.title_units.className += " netdata-legend-title-units";
+                this.element_legend_childs.title_units.innerText = this.units_current;
+                this.element_legend.appendChild(this.element_legend_childs.title_units);
+                this.tmp.__last_shown_legend_units = undefined;
+
+                this.element_legend.appendChild(document.createElement('br'));
+
+                this.element_legend_childs.perfect_scroller.className = 'netdata-legend-series';
+                this.element_legend.appendChild(this.element_legend_childs.perfect_scroller);
+
+                content.className = 'netdata-legend-series-content';
+                this.element_legend_childs.perfect_scroller.appendChild(content);
+
+                this.element_legend_childs.content = content;
+
+                if(NETDATA.options.current.show_help === true)
+                    $(content).popover({
+                    container: "body",
+                    animation: false,
+                    html: true,
+                    trigger: 'hover',
+                    placement: 'bottom',
+                    title: 'Chart Legend',
+                    delay: { show: NETDATA.options.current.show_help_delay_show_ms, hide: NETDATA.options.current.show_help_delay_hide_ms },
+                    content: 'You can click or tap on the values or the labels to select dimensions. By pressing SHIFT or CONTROL, you can enable or disable multiple dimensions.<br/><small>Help, can be disabled from the settings.</small>'
+                });
+            }
+            else {
+                this.element_legend_childs = {
+                    content: content,
+                    resize_handler: null,
+                    toolbox: null,
+                    toolbox_left: null,
+                    toolbox_right: null,
+                    toolbox_reset: null,
+                    toolbox_zoomin: null,
+                    toolbox_zoomout: null,
+                    toolbox_volume: null,
+                    title_date: null,
+                    title_time: null,
+                    title_units: null,
+                    perfect_scroller: null,
+                    series: {}
+                };
+            }
+
+            if(this.data) {
+                this.element_legend_childs.series.labels_key = this.data.dimension_names.toString();
+                if(this.debug === true)
+                    this.log('labels from data: "' + this.element_legend_childs.series.labels_key + '"');
+
+                for(i = 0, len = this.data.dimension_names.length; i < len ;i++) {
+                    genLabel(this, content, this.data.dimension_ids[i], this.data.dimension_names[i], i);
+                }
+            }
+            else {
+                var tmp = [];
+                keys = Object.keys(this.chart.dimensions);
+                for(i = 0, len = keys.length; i < len ;i++) {
+                    dim = keys[i];
+                    tmp.push(this.chart.dimensions[dim].name);
+                    genLabel(this, content, dim, this.chart.dimensions[dim].name, i);
+                }
+                this.element_legend_childs.series.labels_key = tmp.toString();
+                if(this.debug === true)
+                    this.log('labels from chart: "' + this.element_legend_childs.series.labels_key + '"');
+            }
+
+            // create a hidden div to be used for hidding
+            // the original legend of the chart library
+            var el = document.createElement('div');
+            if(this.element_legend !== null)
+                this.element_legend.appendChild(el);
+            el.style.display = 'none';
+
+            this.element_legend_childs.hidden = document.createElement('div');
+            el.appendChild(this.element_legend_childs.hidden);
+
+            if(this.element_legend_childs.perfect_scroller !== null) {
+                Ps.initialize(this.element_legend_childs.perfect_scroller, {
+                    wheelSpeed: 0.2,
+                    wheelPropagation: true,
+                    swipePropagation: true,
+                    minScrollbarLength: null,
+                    maxScrollbarLength: null,
+                    useBothWheelAxes: false,
+                    suppressScrollX: true,
+                    suppressScrollY: false,
+                    scrollXMarginOffset: 0,
+                    scrollYMarginOffset: 0,
+                    theme: 'default'
+                });
+                Ps.update(this.element_legend_childs.perfect_scroller);
+            }
+
+            this.legendShowLatestValues();
+        };
+
+        this.hasLegend = function() {
+            if(typeof this.tmp.___hasLegendCache___ !== 'undefined')
+                return this.tmp.___hasLegendCache___;
+
+            var leg = false;
+            if(this.library && this.library.legend(this) === 'right-side')
+                leg = true;
+
+            this.tmp.___hasLegendCache___ = leg;
+            return leg;
+        };
+
+        this.legendWidth = function() {
+            return (this.hasLegend())?140:0;
+        };
+
+        this.legendHeight = function() {
+            return $(this.element).height();
+        };
+
+        this.chartWidth = function() {
+            return $(this.element).width() - this.legendWidth();
+        };
+
+        this.chartHeight = function() {
+            return $(this.element).height();
+        };
+
+        this.chartPixelsPerPoint = function() {
+            // force an options provided detail
+            var px = this.pixels_per_point;
+
+            if(this.library && px < this.library.pixels_per_point(this))
+                px = this.library.pixels_per_point(this);
+
+            if(px < NETDATA.options.current.pixels_per_point)
+                px = NETDATA.options.current.pixels_per_point;
+
+            return px;
+        };
+
+        this.needsRecreation = function() {
+            var ret = (
+                    this.chart_created === true
+                    && this.library
+                    && this.library.autoresize() === false
+                    && this.tm.last_resized < NETDATA.options.last_page_resize
+                );
+
+            if(this.debug === true)
+                this.log('needsRecreation(): ' + ret.toString() + ', chart_created = ' + this.chart_created.toString());
+
+            return ret;
+        };
+
+        this.chartDataUniqueID = function() {
+            return this.id + ',' + this.library_name + ',' + this.dimensions + ',' + this.chartURLOptions();
+        };
+
+        this.chartURLOptions = function() {
+            var ret = '';
+
+            if(this.override_options !== null)
+                ret = this.override_options.toString();
+            else
+                ret = this.library.options(this);
+
+            if(this.append_options !== null)
+                ret += '%7C' + this.append_options.toString();
+
+            ret += '%7C' + 'jsonwrap';
+
+            if(NETDATA.options.current.eliminate_zero_dimensions === true)
+                ret += '%7C' + 'nonzero';
+
+            return ret;
+        };
+
+        this.chartURL = function() {
+            var after, before, points_multiplier = 1;
+            if(NETDATA.globalPanAndZoom.isActive()) {
+                if(this.current.force_before_ms !== null && this.current.force_after_ms !== null) {
+                    this.tm.pan_and_zoom_seq = 0;
+
+                    before = Math.round(this.current.force_before_ms / 1000);
+                    after  = Math.round(this.current.force_after_ms / 1000);
+                    this.view_after = after * 1000;
+                    this.view_before = before * 1000;
+
+                    if(NETDATA.options.current.pan_and_zoom_data_padding === true) {
+                        this.requested_padding = Math.round((before - after) / 2);
+                        after -= this.requested_padding;
+                        before += this.requested_padding;
+                        this.requested_padding *= 1000;
+                        points_multiplier = 2;
+                    }
+
+                    this.current.force_before_ms = null;
+                    this.current.force_after_ms = null;
+                }
+                else {
+                    this.tm.pan_and_zoom_seq = NETDATA.globalPanAndZoom.seq;
+
+                    after = Math.round(NETDATA.globalPanAndZoom.force_after_ms / 1000);
+                    before = Math.round(NETDATA.globalPanAndZoom.force_before_ms / 1000);
+                    this.view_after = after * 1000;
+                    this.view_before = before * 1000;
+
+                    this.requested_padding = null;
+                    points_multiplier = 1;
+                }
+            }
+            else {
+                this.tm.pan_and_zoom_seq = 0;
+
+                before = this.before;
+                after  = this.after;
+                this.view_after = after * 1000;
+                this.view_before = before * 1000;
+
+                this.requested_padding = null;
+                points_multiplier = 1;
+            }
+
+            this.requested_after = after * 1000;
+            this.requested_before = before * 1000;
+
+            var data_points;
+            if(NETDATA.options.force_data_points !== 0) {
+                data_points = NETDATA.options.force_data_points;
+                this.data_points = data_points;
+            }
+            else {
+                this.data_points = this.points || Math.round(this.chartWidth() / this.chartPixelsPerPoint());
+                data_points = this.data_points * points_multiplier;
+            }
+
+            // build the data URL
+            this.data_url = this.host + this.chart.data_url;
+            this.data_url += "&format="  + this.library.format();
+            this.data_url += "&points="  + (data_points).toString();
+            this.data_url += "&group="   + this.method;
+            this.data_url += "&gtime="   + this.gtime;
+            this.data_url += "&options=" + this.chartURLOptions();
+
+            if(after)
+                this.data_url += "&after="  + after.toString();
+
+            if(before)
+                this.data_url += "&before=" + before.toString();
+
+            if(this.dimensions)
+                this.data_url += "&dimensions=" + this.dimensions;
+
+            if(NETDATA.options.debug.chart_data_url === true || this.debug === true)
+                this.log('chartURL(): ' + this.data_url + ' WxH:' + this.chartWidth() + 'x' + this.chartHeight() + ' points: ' + data_points.toString() + ' library: ' + this.library_name);
+        };
+
+        this.redrawChart = function() {
+            if(this.data !== null)
+                this.updateChartWithData(this.data);
+        };
+
+        this.updateChartWithData = function(data) {
+            if(this.debug === true)
+                this.log('updateChartWithData() called.');
+
+            // this may force the chart to be re-created
+            resizeChart();
+
+            this.data = data;
+
+            var started = Date.now();
+            var view_update_every = data.view_update_every * 1000;
+
+
+            if(this.data_update_every !== view_update_every) {
+                if(this.element_legend_childs.title_time)
+                    this.element_legend_childs.title_time.title = this.legendResolutionTooltip();
+            }
+
+            // if the result is JSON, find the latest update-every
+            this.data_update_every = view_update_every;
+            this.data_after = data.after * 1000;
+            this.data_before = data.before * 1000;
+            this.netdata_first = data.first_entry * 1000;
+            this.netdata_last = data.last_entry * 1000;
+            this.data_points = data.points;
+
+            data.state = this;
+
+            if(NETDATA.options.current.pan_and_zoom_data_padding === true && this.requested_padding !== null) {
+                if(this.view_after < this.data_after) {
+                    // console.log('adjusting view_after from ' + this.view_after + ' to ' + this.data_after);
+                    this.view_after = this.data_after;
+                }
+
+                if(this.view_before > this.data_before) {
+                    // console.log('adjusting view_before from ' + this.view_before + ' to ' + this.data_before);
+                    this.view_before = this.data_before;
+                }
+            }
+            else {
+                this.view_after = this.data_after;
+                this.view_before = this.data_before;
+            }
+
+            if(this.debug === true) {
+                this.log('UPDATE No ' + this.updates_counter + ' COMPLETED');
+
+                if(this.current.force_after_ms)
+                    this.log('STATUS: forced    : ' + (this.current.force_after_ms / 1000).toString() + ' - ' + (this.current.force_before_ms / 1000).toString());
+                else
+                    this.log('STATUS: forced    : unset');
+
+                this.log('STATUS: requested : ' + (this.requested_after / 1000).toString() + ' - ' + (this.requested_before / 1000).toString());
+                this.log('STATUS: downloaded: ' + (this.data_after / 1000).toString() + ' - ' + (this.data_before / 1000).toString());
+                this.log('STATUS: rendered  : ' + (this.view_after / 1000).toString() + ' - ' + (this.view_before / 1000).toString());
+                this.log('STATUS: points    : ' + (this.data_points).toString());
+            }
+
+            if(this.data_points === 0) {
+                noDataToShow();
+                return;
+            }
+
+            if(this.updates_since_last_creation >= this.library.max_updates_to_recreate()) {
+                if(this.debug === true)
+                    this.log('max updates of ' + this.updates_since_last_creation.toString() + ' reached. Forcing re-generation.');
+
+                init('force');
+                return;
+            }
+
+            // check and update the legend
+            this.legendUpdateDOM();
+
+            if(this.chart_created === true
+                && typeof this.library.update === 'function') {
+
+                if(this.debug === true)
+                    this.log('updating chart...');
+
+                if(callChartLibraryUpdateSafely(data) === false)
+                    return;
+            }
+            else {
+                if(this.debug === true)
+                    this.log('creating chart...');
+
+                if(callChartLibraryCreateSafely(data) === false)
+                    return;
+            }
+            if(this.isVisible() === true) {
+                hideMessage();
+                this.legendShowLatestValues();
+            }
+            else {
+                this.__redraw_on_unhide = true;
+
+                if(this.debug === true)
+                    this.log("drawn while not visible");
+            }
+
+            if(this.selected === true)
+                NETDATA.globalSelectionSync.stop();
+
+            // update the performance counters
+            var now = Date.now();
+            this.tm.last_updated = now;
+
+            // don't update last_autorefreshed if this chart is
+            // forced to be updated with global PanAndZoom
+            if(NETDATA.globalPanAndZoom.isActive())
+                this.tm.last_autorefreshed = 0;
+            else {
+                if(NETDATA.options.current.parallel_refresher === true && NETDATA.options.current.concurrent_refreshes === true && typeof this.force_update_every !== 'number')
+                    this.tm.last_autorefreshed = now - (now % this.data_update_every);
+                else
+                    this.tm.last_autorefreshed = now;
+            }
+
+            this.refresh_dt_ms = now - started;
+            NETDATA.options.auto_refresher_fast_weight += this.refresh_dt_ms;
+
+            if(this.refresh_dt_element !== null)
+                this.refresh_dt_element.innerText = this.refresh_dt_ms.toString();
+
+            if(this.foreign_element_before !== null)
+                this.foreign_element_before.innerText = NETDATA.dateTime.localeDateString(this.view_before) + ' ' + NETDATA.dateTime.localeTimeString(this.view_before);
+
+            if(this.foreign_element_after !== null)
+                this.foreign_element_after.innerText = NETDATA.dateTime.localeDateString(this.view_after) + ' ' + NETDATA.dateTime.localeTimeString(this.view_after);
+
+            if(this.foreign_element_duration !== null)
+                this.foreign_element_duration.innerText = NETDATA.seconds4human(Math.floor((this.view_before - this.view_after) / 1000) + 1);
+
+            if(this.foreign_element_update_every !== null)
+                this.foreign_element_update_every.innerText = NETDATA.seconds4human(Math.floor(this.data_update_every / 1000));
+        };
+
+        this.getSnapshotData = function(key) {
+            if(this.debug === true)
+                this.log('updating from snapshot: ' + key);
+
+            if(typeof netdataSnapshotData.data[key] === 'undefined') {
+                this.log('snapshot does not include data for key "' + key + '"');
+                return null;
+            }
+
+            if(typeof netdataSnapshotData.data[key] !== 'string') {
+                this.log('snapshot data for key "' + key + '" is not string');
+                return null;
+            }
+
+            var uncompressed;
+            try {
+                uncompressed = netdataSnapshotData.uncompress(netdataSnapshotData.data[key]);
+
+                if(uncompressed === null) {
+                    this.log('uncompressed snapshot data for key ' + key + ' is null');
+                    return null;
+                }
+
+                if(typeof uncompressed === 'undefined') {
+                    this.log('uncompressed snapshot data for key ' + key + ' is undefined');
+                    return null;
+                }
+            }
+            catch(e) {
+                this.log('decompression of snapshot data for key ' + key + ' failed');
+                console.log(e);
+                uncompressed = null;
+            }
+
+            if(typeof uncompressed !== 'string') {
+                this.log('uncompressed snapshot data for key ' + key + ' is not string');
+                return null;
+            }
+
+            var data;
+            try {
+                data = JSON.parse(uncompressed);
+            }
+            catch(e) {
+                this.log('parsing snapshot data for key ' + key + ' failed');
+                console.log(e);
+                data = null;
+            }
+
+            return data;
+        };
+
+        this.updateChart = function(callback) {
+            if (this.debug === true)
+                this.log('updateChart()');
+
+            if (this.fetching_data === true) {
+                if (this.debug === true)
+                    this.log('updateChart(): I am already updating...');
+
+                if (typeof callback === 'function')
+                    return callback(false, 'already running');
+
+                return;
+            }
+
+            // due to late initialization of charts and libraries
+            // we need to check this too
+            if (this.enabled === false) {
+                if (this.debug === true)
+                    this.log('updateChart(): I am not enabled');
+
+                if (typeof callback === 'function')
+                    return callback(false, 'not enabled');
+
+                return;
+            }
+
+            if (canBeRendered() === false) {
+                if (this.debug === true)
+                    this.log('updateChart(): cannot be rendered');
+
+                if (typeof callback === 'function')
+                    return callback(false, 'cannot be rendered');
+
+                return;
+            }
+
+            if (that.dom_created !== true) {
+                if (this.debug === true)
+                    this.log('updateChart(): creating DOM');
+
+                createDOM();
+            }
+
+            if (this.chart === null) {
+                if (this.debug === true)
+                    this.log('updateChart(): getting chart');
+
+                return this.getChart(function () {
+                    return that.updateChart(callback);
+                });
+            }
+
+            if(this.library.initialized === false) {
+                if(this.library.enabled === true) {
+                    if(this.debug === true)
+                        this.log('updateChart(): initializing chart library');
+
+                    return this.library.initialize(function () {
+                        return that.updateChart(callback);
+                    });
+                }
+                else {
+                    error('chart library "' + this.library_name + '" is not available.');
+
+                    if(typeof callback === 'function')
+                        return callback(false, 'library not available');
+
+                    return;
+                }
+            }
+
+            this.clearSelection();
+            this.chartURL();
+
+            NETDATA.statistics.refreshes_total++;
+            NETDATA.statistics.refreshes_active++;
+
+            if(NETDATA.statistics.refreshes_active > NETDATA.statistics.refreshes_active_max)
+                NETDATA.statistics.refreshes_active_max = NETDATA.statistics.refreshes_active;
+
+            var ok = false;
+            this.fetching_data = true;
+
+            if(netdataSnapshotData !== null) {
+                var key = this.chartDataUniqueID();
+                var data = this.getSnapshotData(key);
+                if (data !== null) {
+                    ok = true;
+                    data = NETDATA.xss.checkData('/api/v1/data', data, this.library.xssRegexIgnore);
+                    this.updateChartWithData(data);
+                }
+                else {
+                    ok = false;
+                    error('cannot get data from snapshot for key: "' + key + '"');
+                    that.tm.last_autorefreshed = Date.now();
+                }
+
+                NETDATA.statistics.refreshes_active--;
+                this.fetching_data = false;
+
+                if(typeof callback === 'function')
+                    callback(ok, 'snapshot');
+
+                return;
+            }
+
+            if(this.debug === true)
+                this.log('updating from ' + this.data_url);
+
+            this.xhr = $.ajax( {
+                url: this.data_url,
+                cache: false,
+                async: true,
+                headers: {
+                    'Cache-Control': 'no-cache, no-store',
+                    'Pragma': 'no-cache'
+                },
+                xhrFields: { withCredentials: true } // required for the cookie
+            })
+            .done(function(data) {
+                data = NETDATA.xss.checkData('/api/v1/data', data, that.library.xssRegexIgnore);
+
+                that.xhr = undefined;
+                that.retries_on_data_failures = 0;
+                ok = true;
+
+                if(that.debug === true)
+                    that.log('data received. updating chart.');
+
+                that.updateChartWithData(data);
+            })
+            .fail(function(msg) {
+                that.xhr = undefined;
+
+                if(msg.statusText !== 'abort') {
+                    that.retries_on_data_failures++;
+                    if(that.retries_on_data_failures > NETDATA.options.current.retries_on_data_failures) {
+                        // that.log('failed ' + that.retries_on_data_failures.toString() + ' times - giving up');
+                        that.retries_on_data_failures = 0;
+                        error('data download failed for url: ' + that.data_url);
+                    }
+                    else {
+                        that.tm.last_autorefreshed = Date.now();
+                        // that.log('failed ' + that.retries_on_data_failures.toString() + ' times, but I will retry');
+                    }
+                }
+            })
+            .always(function() {
+                that.xhr = undefined;
+
+                NETDATA.statistics.refreshes_active--;
+                that.fetching_data = false;
+
+                if(typeof callback === 'function')
+                    return callback(ok, 'download');
+            });
+        };
+
+        var __isVisible = function() {
+            var ret = true;
+
+            if(NETDATA.options.current.update_only_visible !== false) {
+                // tolerance is the number of pixels a chart can be off-screen
+                // to consider it as visible and refresh it as if was visible
+                var tolerance = 0;
+
+                that.tm.last_visible_check = Date.now();
+
+                var rect = that.element.getBoundingClientRect();
+
+                var screenTop = window.scrollY;
+                var screenBottom = screenTop + window.innerHeight;
+
+                var chartTop = rect.top + screenTop;
+                var chartBottom = chartTop + rect.height;
+
+                ret = !(rect.width === 0 || rect.height === 0 || chartBottom + tolerance < screenTop || chartTop - tolerance > screenBottom);
+            }
+
+            if(that.debug === true)
+                that.log('__isVisible(): ' + ret);
+
+            return ret;
+        };
+
+        this.isVisible = function(nocache) {
+            // this.log('last_visible_check: ' + this.tm.last_visible_check + ', last_page_scroll: ' + NETDATA.options.last_page_scroll);
+
+            // caching - we do not evaluate the charts visibility
+            // if the page has not been scrolled since the last check
+            if((typeof nocache !== 'undefined' && nocache === true)
+                || typeof this.tmp.___isVisible___ === 'undefined'
+                || this.tm.last_visible_check <= NETDATA.options.last_page_scroll) {
+                this.tmp.___isVisible___ = __isVisible();
+                if (this.tmp.___isVisible___ === true) this.unhideChart();
+                else this.hideChart();
+            }
+
+            if(this.debug === true)
+                this.log('isVisible(' + nocache + '): ' + this.tmp.___isVisible___);
+
+            return this.tmp.___isVisible___;
+        };
+
+        this.isAutoRefreshable = function() {
+            return (this.current.autorefresh);
+        };
+
+        this.canBeAutoRefreshed = function() {
+            if(this.enabled === false) {
+                if(this.debug === true)
+                    this.log('canBeAutoRefreshed() -> not enabled');
+
+                return false;
+            }
+
+            if(this.running === true) {
+                if(this.debug === true)
+                    this.log('canBeAutoRefreshed() -> already running');
+
+                return false;
+            }
+
+            if(this.library === null || this.library.enabled === false) {
+                error('charting library "' + this.library_name + '" is not available');
+                if(this.debug === true)
+                    this.log('canBeAutoRefreshed() -> chart library ' + this.library_name + ' is not available');
+
+                return false;
+            }
+
+            if(this.isVisible() === false) {
+                if(NETDATA.options.debug.visibility === true || this.debug === true)
+                    this.log('canBeAutoRefreshed() -> not visible');
+
+                return false;
+            }
+
+            var now = Date.now();
+
+            if(this.current.force_update_at !== 0 && this.current.force_update_at < now) {
+                if(this.debug === true)
+                    this.log('canBeAutoRefreshed() -> timed force update - allowing this update');
+
+                this.current.force_update_at = 0;
+                return true;
+            }
+
+            if(this.isAutoRefreshable() === false) {
+                if(this.debug === true)
+                    this.log('canBeAutoRefreshed() -> not auto-refreshable');
+
+                return false;
+            }
+
+            // allow the first update, even if the page is not visible
+            if(NETDATA.options.page_is_visible === false && this.updates_counter && this.updates_since_last_unhide) {
+                if(NETDATA.options.debug.focus === true || this.debug === true)
+                    this.log('canBeAutoRefreshed() -> not the first update, and page does not have focus');
+
+                return false;
+            }
+
+            if(this.needsRecreation() === true) {
+                if(this.debug === true)
+                    this.log('canBeAutoRefreshed() -> needs re-creation.');
+
+                return true;
+            }
+
+            if(NETDATA.options.auto_refresher_stop_until >= now) {
+                if(this.debug === true)
+                    this.log('canBeAutoRefreshed() -> stopped until is in future.');
+
+                return false;
+            }
+
+            // options valid only for autoRefresh()
+            if(NETDATA.globalPanAndZoom.isActive()) {
+                if(NETDATA.globalPanAndZoom.shouldBeAutoRefreshed(this)) {
+                    if(this.debug === true)
+                        this.log('canBeAutoRefreshed(): global panning: I need an update.');
+
+                    return true;
+                }
+                else {
+                    if(this.debug === true)
+                        this.log('canBeAutoRefreshed(): global panning: I am already up to date.');
+
+                    return false;
+                }
+            }
+
+            if(this.selected === true) {
+                if(this.debug === true)
+                    this.log('canBeAutoRefreshed(): I have a selection in place.');
+
+                return false;
+            }
+
+            if(this.paused === true) {
+                if(this.debug === true)
+                    this.log('canBeAutoRefreshed(): I am paused.');
+
+                return false;
+            }
+
+            var data_update_every = this.data_update_every;
+            if(typeof this.force_update_every === 'number')
+                data_update_every = this.force_update_every;
+
+            if(now - this.tm.last_autorefreshed >= data_update_every) {
+                if(this.debug === true)
+                    this.log('canBeAutoRefreshed(): It is time to update me. Now: ' + now.toString() + ', last_autorefreshed: ' + this.tm.last_autorefreshed + ', data_update_every: ' + data_update_every + ', delta: ' + (now - this.tm.last_autorefreshed).toString());
+
+                return true;
+            }
+
+            return false;
+        };
+
+        this.autoRefresh = function(callback) {
+            var state = that;
+
+            if(state.canBeAutoRefreshed() === true && state.running === false) {
+
+                state.running = true;
+                state.updateChart(function() {
+                    state.running = false;
+
+                    if(typeof callback === 'function')
+                        return callback();
+                });
+            }
+            else {
+                if(typeof callback === 'function')
+                    return callback();
+            }
+        };
+
+        this.__defaultsFromDownloadedChart = function(chart) {
+            this.chart = chart;
+            this.chart_url = chart.url;
+            this.data_update_every = chart.update_every * 1000;
+            this.data_points = Math.round(this.chartWidth() / this.chartPixelsPerPoint());
+            this.tm.last_info_downloaded = Date.now();
+
+            if(this.title === null)
+                this.title = chart.title;
+
+            if(this.units === null) {
+                this.units = chart.units;
+                this.units_current = this.units;
+            }
+        };
+
+        // fetch the chart description from the netdata server
+        this.getChart = function(callback) {
+            this.chart = NETDATA.chartRegistry.get(this.host, this.id);
+            if(this.chart) {
+                this.__defaultsFromDownloadedChart(this.chart);
+
+                if(typeof callback === 'function')
+                    return callback();
+            }
+            else if(netdataSnapshotData !== null) {
+                // console.log(this);
+                // console.log(NETDATA.chartRegistry);
+                NETDATA.error(404, 'host: ' + this.host + ', chart: ' +  this.id);
+                error('chart not found in snapshot');
+
+                if(typeof callback === 'function')
+                    return callback();
+            }
+            else {
+                this.chart_url = "/api/v1/chart?chart=" + this.id;
+
+                if(this.debug === true)
+                    this.log('downloading ' + this.chart_url);
+
+                $.ajax( {
+                    url:  this.host + this.chart_url,
+                    cache: false,
+                    async: true,
+                    xhrFields: { withCredentials: true } // required for the cookie
+                })
+                .done(function(chart) {
+                    chart = NETDATA.xss.checkOptional('/api/v1/chart', chart);
+
+                    chart.url = that.chart_url;
+                    that.__defaultsFromDownloadedChart(chart);
+                    NETDATA.chartRegistry.add(that.host, that.id, chart);
+                })
+                .fail(function() {
+                    NETDATA.error(404, that.chart_url);
+                    error('chart not found on url "' + that.chart_url + '"');
+                })
+                .always(function() {
+                    if(typeof callback === 'function')
+                        return callback();
+                });
+            }
+        };
+
+        // ============================================================================================================
+        // INITIALIZATION
+
+        initDOM();
+        init('fast');
+    };
+
+    NETDATA.resetAllCharts = function(state) {
+        // first clear the global selection sync
+        // to make sure no chart is in selected state
+        NETDATA.globalSelectionSync.stop();
+
+        // there are 2 possibilities here
+        // a. state is the global Pan and Zoom master
+        // b. state is not the global Pan and Zoom master
+        var master = true;
+        if(NETDATA.globalPanAndZoom.isMaster(state) === false)
+            master = false;
+
+        // clear the global Pan and Zoom
+        // this will also refresh the master
+        // and unblock any charts currently mirroring the master
+        NETDATA.globalPanAndZoom.clearMaster();
+
+        // if we were not the master, reset our status too
+        // this is required because most probably the mouse
+        // is over this chart, blocking it from auto-refreshing
+        if(master === false && (state.paused === true || state.selected === true))
+            state.resetChart();
+    };
+
+    // get or create a chart state, given a DOM element
+    NETDATA.chartState = function(element) {
+        var self = $(element);
+
+        var state = self.data('netdata-state-object') || null;
+        if(state === null) {
+            state = new chartState(element);
+            self.data('netdata-state-object', state);
+        }
+        return state;
+    };
+
+    // ----------------------------------------------------------------------------------------------------------------
+    // Library functions
+
+    // Load a script without jquery
+    // This is used to load jquery - after it is loaded, we use jquery
+    NETDATA._loadjQuery = function(callback) {
+        if(typeof jQuery === 'undefined') {
+            if(NETDATA.options.debug.main_loop === true)
+                console.log('loading ' + NETDATA.jQuery);
+
+            var script = document.createElement('script');
+            script.type = 'text/javascript';
+            script.async = true;
+            script.src = NETDATA.jQuery;
+
+            // script.onabort = onError;
+            script.onerror = function() { NETDATA.error(101, NETDATA.jQuery); };
+            if(typeof callback === "function") {
+                script.onload = function () {
+                    $ = jQuery;
+                    return callback();
+                };
+            }
+
+            var s = document.getElementsByTagName('script')[0];
+            s.parentNode.insertBefore(script, s);
+        }
+        else if(typeof callback === "function") {
+            $ = jQuery;
+            return callback();
+        }
+    };
+
+    NETDATA._loadCSS = function(filename) {
+        // don't use jQuery here
+        // styles are loaded before jQuery
+        // to eliminate showing an unstyled page to the user
+
+        var fileref = document.createElement("link");
+        fileref.setAttribute("rel", "stylesheet");
+        fileref.setAttribute("type", "text/css");
+        fileref.setAttribute("href", filename);
+
+        if (typeof fileref !== 'undefined')
+            document.getElementsByTagName("head")[0].appendChild(fileref);
+    };
+
+    NETDATA.colorHex2Rgb = function(hex) {
+        // Expand shorthand form (e.g. "03F") to full form (e.g. "0033FF")
+        var shorthandRegex = /^#?([a-f\d])([a-f\d])([a-f\d])$/i;
+            hex = hex.replace(shorthandRegex, function(m, r, g, b) {
+            return r + r + g + g + b + b;
+        });
+
+        var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
+        return result ? {
+            r: parseInt(result[1], 16),
+            g: parseInt(result[2], 16),
+            b: parseInt(result[3], 16)
+        } : null;
+    };
+
+    NETDATA.colorLuminance = function(hex, lum) {
+        // validate hex string
+        hex = String(hex).replace(/[^0-9a-f]/gi, '');
+        if (hex.length < 6)
+            hex = hex[0]+hex[0]+hex[1]+hex[1]+hex[2]+hex[2];
+
+        lum = lum || 0;
+
+        // convert to decimal and change luminosity
+        var rgb = "#", c, i;
+        for (i = 0; i < 3; i++) {
+            c = parseInt(hex.substr(i*2,2), 16);
+            c = Math.round(Math.min(Math.max(0, c + (c * lum)), 255)).toString(16);
+            rgb += ("00"+c).substr(c.length);
+        }
+
+        return rgb;
+    };
+
+    NETDATA.guid = function() {
+        function s4() {
+            return Math.floor((1 + Math.random()) * 0x10000)
+                    .toString(16)
+                    .substring(1);
+            }
+
+            return s4() + s4() + '-' + s4() + '-' + s4() + '-' + s4() + '-' + s4() + s4() + s4();
+    };
+
+    NETDATA.zeropad = function(x) {
+        if(x > -10 && x < 10) return '0' + x.toString();
+        else return x.toString();
+    };
+
+    // user function to signal us the DOM has been
+    // updated.
+    NETDATA.updatedDom = function() {
+        NETDATA.options.updated_dom = true;
+    };
+
+    NETDATA.ready = function(callback) {
+        NETDATA.options.pauseCallback = callback;
+    };
+
+    NETDATA.pause = function(callback) {
+        if(typeof callback === 'function') {
+            if (NETDATA.options.pause === true)
+                return callback();
+            else
+                NETDATA.options.pauseCallback = callback;
+        }
+    };
+
+    NETDATA.unpause = function() {
+        NETDATA.options.pauseCallback = null;
+        NETDATA.options.updated_dom = true;
+        NETDATA.options.pause = false;
+    };
+
+    NETDATA.seconds4human = function (seconds, options) {
+        var default_options = {
+            now: 'now',
+            space: ' ',
+            negative_suffix: 'ago',
+            day: 'day',
+            days: 'days',
+            hour: 'hour',
+            hours: 'hours',
+            minute: 'min',
+            minutes: 'mins',
+            second: 'sec',
+            seconds: 'secs',
+            and: 'and'
+        };
+
+        if(typeof options !== 'object')
+            options = default_options;
+        else {
+            var x;
+            for(x in default_options) {
+                if(typeof options[x] !== 'string')
+                    options[x] = default_options[x];
+            }
+        }
+
+        if(typeof seconds === 'string')
+            seconds = parseInt(seconds, 10);
+
+        if(seconds === 0)
+            return options.now;
+
+        var suffix = '';
+        if(seconds < 0) {
+            seconds = -seconds;
+            if(options.negative_suffix !== '') suffix = options.space + options.negative_suffix;
+        }
+
+        var days = Math.floor(seconds / 86400);
+        seconds -= (days * 86400);
+
+        var hours = Math.floor(seconds / 3600);
+        seconds -= (hours * 3600);
+
+        var minutes = Math.floor(seconds / 60);
+        seconds -= (minutes * 60);
+
+        var strings = [];
+
+        if(days > 1) strings.push(days.toString() + options.space + options.days);
+        else if(days === 1) strings.push(days.toString() + options.space + options.day);
+
+        if(hours > 1) strings.push(hours.toString() + options.space + options.hours);
+        else if(hours === 1) strings.push(hours.toString() + options.space + options.hour);
+
+        if(minutes > 1) strings.push(minutes.toString() + options.space + options.minutes);
+        else if(minutes === 1) strings.push(minutes.toString() + options.space + options.minute);
+
+        if(seconds > 1) strings.push(Math.floor(seconds).toString() + options.space + options.seconds);
+        else if(seconds === 1) strings.push(Math.floor(seconds).toString() + options.space + options.second);
+
+        if(strings.length === 1)
+            return strings.pop() + suffix;
+
+        var last = strings.pop();
+        return strings.join(", ") + " " + options.and + " " + last + suffix;
+    };
+
+    // ----------------------------------------------------------------------------------------------------------------
+
+    // this is purely sequential charts refresher
+    // it is meant to be autonomous
+    NETDATA.chartRefresherNoParallel = function(index, callback) {
+        var targets = NETDATA.intersectionObserver.targets();
+
+        if(NETDATA.options.debug.main_loop === true)
+            console.log('NETDATA.chartRefresherNoParallel(' + index + ')');
+
+        if(NETDATA.options.updated_dom === true) {
+            // the dom has been updated
+            // get the dom parts again
+            NETDATA.parseDom(callback);
+            return;
+        }
+        if(index >= targets.length) {
+            if(NETDATA.options.debug.main_loop === true)
+                console.log('waiting to restart main loop...');
+
+            NETDATA.options.auto_refresher_fast_weight = 0;
+            callback();
+        }
+        else {
+            var state = targets[index];
+
+            if(NETDATA.options.auto_refresher_fast_weight < NETDATA.options.current.fast_render_timeframe) {
+                if(NETDATA.options.debug.main_loop === true)
+                    console.log('fast rendering...');
+
+                if(state.isVisible() === true)
+                    NETDATA.timeout.set(function() {
+                        state.autoRefresh(function () {
+                            NETDATA.chartRefresherNoParallel(++index, callback);
+                        });
+                    }, 0);
+                else
+                    NETDATA.chartRefresherNoParallel(++index, callback);
+            }
+            else {
+                if(NETDATA.options.debug.main_loop === true) console.log('waiting for next refresh...');
+                NETDATA.options.auto_refresher_fast_weight = 0;
+
+                NETDATA.timeout.set(function() {
+                    state.autoRefresh(function() {
+                        NETDATA.chartRefresherNoParallel(++index, callback);
+                    });
+                }, NETDATA.options.current.idle_between_charts);
+            }
+        }
+    };
+
+    NETDATA.chartRefresherWaitTime = function() {
+        return NETDATA.options.current.idle_parallel_loops;
+    };
+
+    // the default refresher
+    NETDATA.chartRefresherLastRun = 0;
+    NETDATA.chartRefresherRunsAfterParseDom = 0;
+    NETDATA.chartRefresherTimeoutId = undefined;
+
+    NETDATA.chartRefresherReschedule = function() {
+        if(NETDATA.options.current.async_on_scroll === true) {
+            if(NETDATA.chartRefresherTimeoutId)
+                NETDATA.timeout.clear(NETDATA.chartRefresherTimeoutId);
+            NETDATA.chartRefresherTimeoutId = NETDATA.timeout.set(NETDATA.chartRefresher, NETDATA.options.current.onscroll_worker_duration_threshold);
+            //console.log('chartRefresherReschedule()');
+        }
+    };
+
+    NETDATA.chartRefresher = function() {
+        // console.log('chartRefresher() begin ' + (Date.now() - NETDATA.chartRefresherLastRun).toString() + ' ms since last run');
+
+        if(NETDATA.options.page_is_visible === false
+            && NETDATA.options.current.stop_updates_when_focus_is_lost === true
+            && NETDATA.chartRefresherLastRun > NETDATA.options.last_page_resize
+            && NETDATA.chartRefresherLastRun > NETDATA.options.last_page_scroll
+            && NETDATA.chartRefresherRunsAfterParseDom > 10
+        ) {
+            setTimeout(
+                NETDATA.chartRefresher,
+                NETDATA.options.current.idle_lost_focus
+            );
+
+            // console.log('chartRefresher() page without focus, will run in ' + NETDATA.options.current.idle_lost_focus.toString() + ' ms, ' + NETDATA.chartRefresherRunsAfterParseDom.toString());
+            return;
+        }
+        NETDATA.chartRefresherRunsAfterParseDom++;
+
+        var now = Date.now();
+        NETDATA.chartRefresherLastRun = now;
+
+        if( now < NETDATA.options.on_scroll_refresher_stop_until ) {
+            NETDATA.chartRefresherTimeoutId = NETDATA.timeout.set(
+                NETDATA.chartRefresher,
+                NETDATA.chartRefresherWaitTime()
+            );
+
+            // console.log('chartRefresher() end1 will run in ' + NETDATA.chartRefresherWaitTime().toString() + ' ms');
+            return;
+        }
+
+        if( now < NETDATA.options.auto_refresher_stop_until ) {
+            NETDATA.chartRefresherTimeoutId = NETDATA.timeout.set(
+                NETDATA.chartRefresher,
+                NETDATA.chartRefresherWaitTime()
+            );
+
+            // console.log('chartRefresher() end2 will run in ' + NETDATA.chartRefresherWaitTime().toString() + ' ms');
+            return;
+        }
+
+        if(NETDATA.options.pause === true) {
+            // console.log('auto-refresher is paused');
+            NETDATA.chartRefresherTimeoutId = NETDATA.timeout.set(
+                NETDATA.chartRefresher,
+                NETDATA.chartRefresherWaitTime()
+            );
+
+            // console.log('chartRefresher() end3 will run in ' + NETDATA.chartRefresherWaitTime().toString() + ' ms');
+            return;
+        }
+
+        if(typeof NETDATA.options.pauseCallback === 'function') {
+            // console.log('auto-refresher is calling pauseCallback');
+
+            NETDATA.options.pause = true;
+            NETDATA.options.pauseCallback();
+            NETDATA.chartRefresher();
+
+            // console.log('chartRefresher() end4 (nested)');
+            return;
+        }
+
+        if(NETDATA.options.current.parallel_refresher === false) {
+            // console.log('auto-refresher is calling chartRefresherNoParallel(0)');
+            NETDATA.chartRefresherNoParallel(0, function() {
+                NETDATA.chartRefresherTimeoutId = NETDATA.timeout.set(
+                    NETDATA.chartRefresher,
+                    NETDATA.options.current.idle_between_loops
+                );
+            });
+            // console.log('chartRefresher() end5 (no parallel, nested)');
+            return;
+        }
+
+        if(NETDATA.options.updated_dom === true) {
+            // the dom has been updated
+            // get the dom parts again
+            // console.log('auto-refresher is calling parseDom()');
+            NETDATA.parseDom(NETDATA.chartRefresher);
+            // console.log('chartRefresher() end6 (parseDom)');
+            return;
+        }
+
+        if(NETDATA.globalSelectionSync.active() === false) {
+            var parallel = [];
+            var targets = NETDATA.intersectionObserver.targets();
+            var len = targets.length;
+            var state;
+            while(len--) {
+                state = targets[len];
+                if(state.running === true || state.isVisible() === false)
+                    continue;
+
+                if(state.library.initialized === false) {
+                    if(state.library.enabled === true) {
+                        state.library.initialize(NETDATA.chartRefresher);
+                        //console.log('chartRefresher() end6 (library init)');
+                        return;
+                    }
+                    else {
+                        state.error('chart library "' + state.library_name + '" is not enabled.');
+                    }
+                }
+
+                if(NETDATA.scrollUp === true)
+                    parallel.unshift(state);
+                else
+                    parallel.push(state);
+            }
+
+            len = parallel.length;
+            while (len--) {
+                state = parallel[len];
+                // console.log('auto-refresher executing in parallel for ' + parallel.length.toString() + ' charts');
+                // this will execute the jobs in parallel
+
+                if (state.running === false)
+                    NETDATA.timeout.set(state.autoRefresh, 0);
+            }
+            //else {
+            //    console.log('auto-refresher nothing to do');
+            //}
+        }
+
+        // run the next refresh iteration
+        NETDATA.chartRefresherTimeoutId = NETDATA.timeout.set(
+            NETDATA.chartRefresher,
+            NETDATA.chartRefresherWaitTime()
+        );
+
+        //console.log('chartRefresher() completed in ' + (Date.now() - now).toString() + ' ms');
+    };
+
+    NETDATA.parseDom = function(callback) {
+        //console.log('parseDom()');
+
+        NETDATA.options.last_page_scroll = Date.now();
+        NETDATA.options.updated_dom = false;
+        NETDATA.chartRefresherRunsAfterParseDom = 0;
+
+        var targets = $('div[data-netdata]'); //.filter(':visible');
+
+        if(NETDATA.options.debug.main_loop === true)
+            console.log('DOM updated - there are ' + targets.length + ' charts on page.');
+
+        NETDATA.intersectionObserver.globalReset();
+        NETDATA.options.targets = [];
+        var len = targets.length;
+        while(len--) {
+            // the initialization will take care of sizing
+            // and the "loading..." message
+            var state = NETDATA.chartState(targets[len]);
+            NETDATA.options.targets.push(state);
+            NETDATA.intersectionObserver.observe(state);
+        }
+
+        if(NETDATA.globalChartUnderlay.isActive() === true)
+            NETDATA.globalChartUnderlay.setup();
+        else
+            NETDATA.globalChartUnderlay.clear();
+
+        if(typeof callback === 'function')
+            return callback();
+    };
+
+    // this is the main function - where everything starts
+    NETDATA.started = false;
+    NETDATA.start = function() {
+        // this should be called only once
+
+        if(NETDATA.started === true) {
+            console.log('netdata is already started');
+            return;
+        }
+
+        NETDATA.started = true;
+        NETDATA.options.page_is_visible = true;
+
+        $(window).blur(function() {
+            if(NETDATA.options.current.stop_updates_when_focus_is_lost === true) {
+                NETDATA.options.page_is_visible = false;
+                if(NETDATA.options.debug.focus === true)
+                    console.log('Lost Focus!');
+            }
+        });
+
+        $(window).focus(function() {
+            if(NETDATA.options.current.stop_updates_when_focus_is_lost === true) {
+                NETDATA.options.page_is_visible = true;
+                if(NETDATA.options.debug.focus === true)
+                    console.log('Focus restored!');
+            }
+        });
+
+        if(typeof document.hasFocus === 'function' && !document.hasFocus()) {
+            if(NETDATA.options.current.stop_updates_when_focus_is_lost === true) {
+                NETDATA.options.page_is_visible = false;
+                if(NETDATA.options.debug.focus === true)
+                    console.log('Document has no focus!');
+            }
+        }
+
+        // bootstrap tab switching
+        $('a[data-toggle="tab"]').on('shown.bs.tab', NETDATA.onscroll);
+
+        // bootstrap modal switching
+        var $modal = $('.modal');
+        $modal.on('hidden.bs.modal', NETDATA.onscroll);
+        $modal.on('shown.bs.modal', NETDATA.onscroll);
+
+        // bootstrap collapse switching
+        var $collapse = $('.collapse');
+        $collapse.on('hidden.bs.collapse', NETDATA.onscroll);
+        $collapse.on('shown.bs.collapse', NETDATA.onscroll);
+
+        NETDATA.parseDom(NETDATA.chartRefresher);
+
+        // Alarms initialization
+        setTimeout(NETDATA.alarms.init, 1000);
+
+        // Registry initialization
+        setTimeout(NETDATA.registry.init, netdataRegistryAfterMs);
+
+        if(typeof netdataCallback === 'function')
+            netdataCallback();
+    };
+
+    NETDATA.globalReset = function() {
+        NETDATA.intersectionObserver.globalReset();
+        NETDATA.globalSelectionSync.globalReset();
+        NETDATA.globalPanAndZoom.globalReset();
+        NETDATA.chartRegistry.globalReset();
+        NETDATA.commonMin.globalReset();
+        NETDATA.commonMax.globalReset();
+        NETDATA.commonColors.globalReset();
+        NETDATA.unitsConversion.globalReset();
+        NETDATA.options.targets = [];
+        NETDATA.parseDom();
+        NETDATA.unpause();
+    };
+
+    // ----------------------------------------------------------------------------------------------------------------
+    // peity
+
+    NETDATA.peityInitialize = function(callback) {
+        if(typeof netdataNoPeitys === 'undefined' || !netdataNoPeitys) {
+            $.ajax({
+                url: NETDATA.peity_js,
+                cache: true,
+                dataType: "script",
+                xhrFields: { withCredentials: true } // required for the cookie
+            })
+            .done(function() {
+                NETDATA.registerChartLibrary('peity', NETDATA.peity_js);
+            })
+            .fail(function() {
+                NETDATA.chartLibraries.peity.enabled = false;
+                NETDATA.error(100, NETDATA.peity_js);
+            })
+            .always(function() {
+                if(typeof callback === "function")
+                    return callback();
+            });
+        }
+        else {
+            NETDATA.chartLibraries.peity.enabled = false;
+            if(typeof callback === "function")
+                return callback();
+        }
+    };
+
+    NETDATA.peityChartUpdate = function(state, data) {
+        state.peity_instance.innerHTML = data.result;
+
+        if(state.peity_options.stroke !== state.chartCustomColors()[0]) {
+            state.peity_options.stroke = state.chartCustomColors()[0];
+            if(state.chart.chart_type === 'line')
+                state.peity_options.fill = NETDATA.themes.current.background;
+            else
+                state.peity_options.fill = NETDATA.colorLuminance(state.chartCustomColors()[0], NETDATA.chartDefaults.fill_luminance);
+        }
+
+        $(state.peity_instance).peity('line', state.peity_options);
+        return true;
+    };
+
+    NETDATA.peityChartCreate = function(state, data) {
+        state.peity_instance = document.createElement('div');
+        state.element_chart.appendChild(state.peity_instance);
+
+        state.peity_options = {
+            stroke: NETDATA.themes.current.foreground,
+            strokeWidth: NETDATA.dataAttribute(state.element, 'peity-strokewidth', 1),
+            width: state.chartWidth(),
+            height: state.chartHeight(),
+            fill: NETDATA.themes.current.foreground
+        };
+
+        NETDATA.peityChartUpdate(state, data);
+        return true;
+    };
+
+    // ----------------------------------------------------------------------------------------------------------------
+    // sparkline
+
+    NETDATA.sparklineInitialize = function(callback) {
+        if(typeof netdataNoSparklines === 'undefined' || !netdataNoSparklines) {
+            $.ajax({
+                url: NETDATA.sparkline_js,
+                cache: true,
+                dataType: "script",
+                xhrFields: { withCredentials: true } // required for the cookie
+            })
+            .done(function() {
+                NETDATA.registerChartLibrary('sparkline', NETDATA.sparkline_js);
+            })
+            .fail(function() {
+                NETDATA.chartLibraries.sparkline.enabled = false;
+                NETDATA.error(100, NETDATA.sparkline_js);
+            })
+            .always(function() {
+                if(typeof callback === "function")
+                    return callback();
+            });
+        }
+        else {
+            NETDATA.chartLibraries.sparkline.enabled = false;
+            if(typeof callback === "function")
+                return callback();
+        }
+    };
+
+    NETDATA.sparklineChartUpdate = function(state, data) {
+        state.sparkline_options.width = state.chartWidth();
+        state.sparkline_options.height = state.chartHeight();
+
+        $(state.element_chart).sparkline(data.result, state.sparkline_options);
+        return true;
+    };
+
+    NETDATA.sparklineChartCreate = function(state, data) {
+        var type = NETDATA.dataAttribute(state.element, 'sparkline-type', 'line');
+        var lineColor = NETDATA.dataAttribute(state.element, 'sparkline-linecolor', state.chartCustomColors()[0]);
+        var fillColor = NETDATA.dataAttribute(state.element, 'sparkline-fillcolor', ((state.chart.chart_type === 'line')?NETDATA.themes.current.background:NETDATA.colorLuminance(lineColor, NETDATA.chartDefaults.fill_luminance)));
+        var chartRangeMin = NETDATA.dataAttribute(state.element, 'sparkline-chartrangemin', undefined);
+        var chartRangeMax = NETDATA.dataAttribute(state.element, 'sparkline-chartrangemax', undefined);
+        var composite = NETDATA.dataAttribute(state.element, 'sparkline-composite', undefined);
+        var enableTagOptions = NETDATA.dataAttribute(state.element, 'sparkline-enabletagoptions', undefined);
+        var tagOptionPrefix = NETDATA.dataAttribute(state.element, 'sparkline-tagoptionprefix', undefined);
+        var tagValuesAttribute = NETDATA.dataAttribute(state.element, 'sparkline-tagvaluesattribute', undefined);
+        var disableHiddenCheck = NETDATA.dataAttribute(state.element, 'sparkline-disablehiddencheck', undefined);
+        var defaultPixelsPerValue = NETDATA.dataAttribute(state.element, 'sparkline-defaultpixelspervalue', undefined);
+        var spotColor = NETDATA.dataAttribute(state.element, 'sparkline-spotcolor', undefined);
+        var minSpotColor = NETDATA.dataAttribute(state.element, 'sparkline-minspotcolor', undefined);
+        var maxSpotColor = NETDATA.dataAttribute(state.element, 'sparkline-maxspotcolor', undefined);
+        var spotRadius = NETDATA.dataAttribute(state.element, 'sparkline-spotradius', undefined);
+        var valueSpots = NETDATA.dataAttribute(state.element, 'sparkline-valuespots', undefined);
+        var highlightSpotColor = NETDATA.dataAttribute(state.element, 'sparkline-highlightspotcolor', undefined);
+        var highlightLineColor = NETDATA.dataAttribute(state.element, 'sparkline-highlightlinecolor', undefined);
+        var lineWidth = NETDATA.dataAttribute(state.element, 'sparkline-linewidth', undefined);
+        var normalRangeMin = NETDATA.dataAttribute(state.element, 'sparkline-normalrangemin', undefined);
+        var normalRangeMax = NETDATA.dataAttribute(state.element, 'sparkline-normalrangemax', undefined);
+        var drawNormalOnTop = NETDATA.dataAttribute(state.element, 'sparkline-drawnormalontop', undefined);
+        var xvalues = NETDATA.dataAttribute(state.element, 'sparkline-xvalues', undefined);
+        var chartRangeClip = NETDATA.dataAttribute(state.element, 'sparkline-chartrangeclip', undefined);
+        var chartRangeMinX = NETDATA.dataAttribute(state.element, 'sparkline-chartrangeminx', undefined);
+        var chartRangeMaxX = NETDATA.dataAttribute(state.element, 'sparkline-chartrangemaxx', undefined);
+        var disableInteraction = NETDATA.dataAttributeBoolean(state.element, 'sparkline-disableinteraction', false);
+        var disableTooltips = NETDATA.dataAttributeBoolean(state.element, 'sparkline-disabletooltips', false);
+        var disableHighlight = NETDATA.dataAttributeBoolean(state.element, 'sparkline-disablehighlight', false);
+        var highlightLighten = NETDATA.dataAttribute(state.element, 'sparkline-highlightlighten', 1.4);
+        var highlightColor = NETDATA.dataAttribute(state.element, 'sparkline-highlightcolor', undefined);
+        var tooltipContainer = NETDATA.dataAttribute(state.element, 'sparkline-tooltipcontainer', undefined);
+        var tooltipClassname = NETDATA.dataAttribute(state.element, 'sparkline-tooltipclassname', undefined);
+        var tooltipFormat = NETDATA.dataAttribute(state.element, 'sparkline-tooltipformat', undefined);
+        var tooltipPrefix = NETDATA.dataAttribute(state.element, 'sparkline-tooltipprefix', undefined);
+        var tooltipSuffix = NETDATA.dataAttribute(state.element, 'sparkline-tooltipsuffix', ' ' + state.units_current);
+        var tooltipSkipNull = NETDATA.dataAttributeBoolean(state.element, 'sparkline-tooltipskipnull', true);
+        var tooltipValueLookups = NETDATA.dataAttribute(state.element, 'sparkline-tooltipvaluelookups', undefined);
+        var tooltipFormatFieldlist = NETDATA.dataAttribute(state.element, 'sparkline-tooltipformatfieldlist', undefined);
+        var tooltipFormatFieldlistKey = NETDATA.dataAttribute(state.element, 'sparkline-tooltipformatfieldlistkey', undefined);
+        var numberFormatter = NETDATA.dataAttribute(state.element, 'sparkline-numberformatter', function(n){ return n.toFixed(2); });
+        var numberDigitGroupSep = NETDATA.dataAttribute(state.element, 'sparkline-numberdigitgroupsep', undefined);
+        var numberDecimalMark = NETDATA.dataAttribute(state.element, 'sparkline-numberdecimalmark', undefined);
+        var numberDigitGroupCount = NETDATA.dataAttribute(state.element, 'sparkline-numberdigitgroupcount', undefined);
+        var animatedZooms = NETDATA.dataAttributeBoolean(state.element, 'sparkline-animatedzooms', false);
+
+        if(spotColor === 'disable') spotColor='';
+        if(minSpotColor === 'disable') minSpotColor='';
+        if(maxSpotColor === 'disable') maxSpotColor='';
+
+        // state.log('sparkline type ' + type + ', lineColor: ' + lineColor + ', fillColor: ' + fillColor);
+
+        state.sparkline_options = {
+            type: type,
+            lineColor: lineColor,
+            fillColor: fillColor,
+            chartRangeMin: chartRangeMin,
+            chartRangeMax: chartRangeMax,
+            composite: composite,
+            enableTagOptions: enableTagOptions,
+            tagOptionPrefix: tagOptionPrefix,
+            tagValuesAttribute: tagValuesAttribute,
+            disableHiddenCheck: disableHiddenCheck,
+            defaultPixelsPerValue: defaultPixelsPerValue,
+            spotColor: spotColor,
+            minSpotColor: minSpotColor,
+            maxSpotColor: maxSpotColor,
+            spotRadius: spotRadius,
+            valueSpots: valueSpots,
+            highlightSpotColor: highlightSpotColor,
+            highlightLineColor: highlightLineColor,
+            lineWidth: lineWidth,
+            normalRangeMin: normalRangeMin,
+            normalRangeMax: normalRangeMax,
+            drawNormalOnTop: drawNormalOnTop,
+            xvalues: xvalues,
+            chartRangeClip: chartRangeClip,
+            chartRangeMinX: chartRangeMinX,
+            chartRangeMaxX: chartRangeMaxX,
+            disableInteraction: disableInteraction,
+            disableTooltips: disableTooltips,
+            disableHighlight: disableHighlight,
+            highlightLighten: highlightLighten,
+            highlightColor: highlightColor,
+            tooltipContainer: tooltipContainer,
+            tooltipClassname: tooltipClassname,
+            tooltipChartTitle: state.title,
+            tooltipFormat: tooltipFormat,
+            tooltipPrefix: tooltipPrefix,
+            tooltipSuffix: tooltipSuffix,
+            tooltipSkipNull: tooltipSkipNull,
+            tooltipValueLookups: tooltipValueLookups,
+            tooltipFormatFieldlist: tooltipFormatFieldlist,
+            tooltipFormatFieldlistKey: tooltipFormatFieldlistKey,
+            numberFormatter: numberFormatter,
+            numberDigitGroupSep: numberDigitGroupSep,
+            numberDecimalMark: numberDecimalMark,
+            numberDigitGroupCount: numberDigitGroupCount,
+            animatedZooms: animatedZooms,
+            width: state.chartWidth(),
+            height: state.chartHeight()
+        };
+
+        $(state.element_chart).sparkline(data.result, state.sparkline_options);
+
+        return true;
+    };
+
+    // ----------------------------------------------------------------------------------------------------------------
+    // dygraph
+
+    NETDATA.dygraph = {
+        smooth: false
+    };
+
+    NETDATA.dygraphToolboxPanAndZoom = function(state, after, before) {
+        if(after < state.netdata_first)
+            after = state.netdata_first;
+
+        if(before > state.netdata_last)
+            before = state.netdata_last;
+
+        state.setMode('zoom');
+        NETDATA.globalSelectionSync.stop();
+        NETDATA.globalSelectionSync.delay();
+        state.tmp.dygraph_user_action = true;
+        state.tmp.dygraph_force_zoom = true;
+        // state.log('toolboxPanAndZoom');
+        state.updateChartPanOrZoom(after, before);
+        NETDATA.globalPanAndZoom.setMaster(state, after, before);
+    };
+
+    NETDATA.dygraphSetSelection = function(state, t) {
+        if(typeof state.tmp.dygraph_instance !== 'undefined') {
+            var r = state.calculateRowForTime(t);
+            if(r !== -1) {
+                state.tmp.dygraph_instance.setSelection(r);
+                return true;
+            }
+            else {
+                state.tmp.dygraph_instance.clearSelection();
+                state.legendShowUndefined();
+            }
+        }
+
+        return false;
+    };
+
+    NETDATA.dygraphClearSelection = function(state) {
+        if(typeof state.tmp.dygraph_instance !== 'undefined') {
+            state.tmp.dygraph_instance.clearSelection();
+        }
+        return true;
+    };
+
+    NETDATA.dygraphSmoothInitialize = function(callback) {
+        $.ajax({
+            url: NETDATA.dygraph_smooth_js,
+            cache: true,
+            dataType: "script",
+            xhrFields: { withCredentials: true } // required for the cookie
+        })
+        .done(function() {
+            NETDATA.dygraph.smooth = true;
+            smoothPlotter.smoothing = 0.3;
+        })
+        .fail(function() {
+            NETDATA.dygraph.smooth = false;
+        })
+        .always(function() {
+            if(typeof callback === "function")
+                return callback();
+        });
+    };
+
+    NETDATA.dygraphInitialize = function(callback) {
+        if(typeof netdataNoDygraphs === 'undefined' || !netdataNoDygraphs) {
+            $.ajax({
+                url: NETDATA.dygraph_js,
+                cache: true,
+                dataType: "script",
+                xhrFields: { withCredentials: true } // required for the cookie
+            })
+            .done(function() {
+                NETDATA.registerChartLibrary('dygraph', NETDATA.dygraph_js);
+            })
+            .fail(function() {
+                NETDATA.chartLibraries.dygraph.enabled = false;
+                NETDATA.error(100, NETDATA.dygraph_js);
+            })
+            .always(function() {
+                if(NETDATA.chartLibraries.dygraph.enabled === true && NETDATA.options.current.smooth_plot === true)
+                    NETDATA.dygraphSmoothInitialize(callback);
+                else if(typeof callback === "function")
+                    return callback();
+            });
+        }
+        else {
+            NETDATA.chartLibraries.dygraph.enabled = false;
+            if(typeof callback === "function")
+                return callback();
+        }
+    };
+
+    NETDATA.dygraphChartUpdate = function(state, data) {
+        var dygraph = state.tmp.dygraph_instance;
+
+        if(typeof dygraph === 'undefined')
+            return NETDATA.dygraphChartCreate(state, data);
+
+        // when the chart is not visible, and hidden
+        // if there is a window resize, dygraph detects
+        // its element size as 0x0.
+        // this will make it re-appear properly
+
+        if(state.tm.last_unhidden > state.tmp.dygraph_last_rendered)
+            dygraph.resize();
+
+        var options = {
+                file: data.result.data,
+                colors: state.chartColors(),
+                labels: data.result.labels,
+                //labelsDivWidth: state.chartWidth() - 70,
+                includeZero: state.tmp.dygraph_include_zero,
+                visibility: state.dimensions_visibility.selected2BooleanArray(state.data.dimension_names)
+        };
+
+        if(state.tmp.dygraph_chart_type === 'stacked') {
+            if(options.includeZero === true && state.dimensions_visibility.countSelected() < options.visibility.length)
+                options.includeZero = 0;
+        }
+
+        if(!NETDATA.chartLibraries.dygraph.isSparkline(state)) {
+            options.ylabel = state.units_current; // (state.units_desired === 'auto')?"":state.units_current;
+        }
+
+        if(state.tmp.dygraph_force_zoom === true) {
+            if(NETDATA.options.debug.dygraph === true || state.debug === true)
+                state.log('dygraphChartUpdate() forced zoom update');
+
+            options.dateWindow = (state.requested_padding !== null)?[ state.view_after, state.view_before ]:null;
+            //options.isZoomedIgnoreProgrammaticZoom = true;
+            state.tmp.dygraph_force_zoom = false;
+        }
+        else if(state.current.name !== 'auto') {
+            if(NETDATA.options.debug.dygraph === true || state.debug === true)
+                state.log('dygraphChartUpdate() loose update');
+        }
+        else {
+            if(NETDATA.options.debug.dygraph === true || state.debug === true)
+                state.log('dygraphChartUpdate() strict update');
+
+            options.dateWindow = (state.requested_padding !== null)?[ state.view_after, state.view_before ]:null;
+            //options.isZoomedIgnoreProgrammaticZoom = true;
+        }
+
+        options.valueRange = state.tmp.dygraph_options.valueRange;
+
+        var oldMax = null, oldMin = null;
+        if (state.tmp.__commonMin !== null) {
+            state.data.min = state.tmp.dygraph_instance.axes_[0].extremeRange[0];
+            oldMin = options.valueRange[0] = NETDATA.commonMin.get(state);
+        }
+        if (state.tmp.__commonMax !== null) {
+            state.data.max = state.tmp.dygraph_instance.axes_[0].extremeRange[1];
+            oldMax = options.valueRange[1] = NETDATA.commonMax.get(state);
+        }
+
+        if(state.tmp.dygraph_smooth_eligible === true) {
+            if((NETDATA.options.current.smooth_plot === true && state.tmp.dygraph_options.plotter !== smoothPlotter)
+                || (NETDATA.options.current.smooth_plot === false && state.tmp.dygraph_options.plotter === smoothPlotter)) {
+                NETDATA.dygraphChartCreate(state, data);
+                return;
+            }
+        }
+
+        if(netdataSnapshotData !== null && NETDATA.globalPanAndZoom.isActive() === true && NETDATA.globalPanAndZoom.isMaster(state) === false) {
+            // pan and zoom on snapshots
+            options.dateWindow = [ NETDATA.globalPanAndZoom.force_after_ms, NETDATA.globalPanAndZoom.force_before_ms ];
+            //options.isZoomedIgnoreProgrammaticZoom = true;
+        }
+
+        if(NETDATA.chartLibraries.dygraph.isLogScale(state) === true) {
+            if(Array.isArray(options.valueRange) && options.valueRange[0] <= 0)
+                options.valueRange[0] = null;
+        }
+
+        dygraph.updateOptions(options);
+
+        var redraw = false;
+        if(oldMin !== null && oldMin > state.tmp.dygraph_instance.axes_[0].extremeRange[0]) {
+            state.data.min = state.tmp.dygraph_instance.axes_[0].extremeRange[0];
+            options.valueRange[0] = NETDATA.commonMin.get(state);
+            redraw = true;
+        }
+        if(oldMax !== null && oldMax < state.tmp.dygraph_instance.axes_[0].extremeRange[1]) {
+            state.data.max = state.tmp.dygraph_instance.axes_[0].extremeRange[1];
+            options.valueRange[1] = NETDATA.commonMax.get(state);
+            redraw = true;
+        }
+
+        if(redraw === true) {
+            // state.log('forcing redraw to adapt to common- min/max');
+            dygraph.updateOptions(options);
+        }
+
+        state.tmp.dygraph_last_rendered = Date.now();
+        return true;
+    };
+
+    NETDATA.dygraphChartCreate = function(state, data) {
+        if(NETDATA.options.debug.dygraph === true || state.debug === true)
+            state.log('dygraphChartCreate()');
+
+        state.tmp.dygraph_chart_type = NETDATA.dataAttribute(state.element, 'dygraph-type', state.chart.chart_type);
+        if(state.tmp.dygraph_chart_type === 'stacked' && data.dimensions === 1) state.tmp.dygraph_chart_type = 'area';
+        if(state.tmp.dygraph_chart_type === 'stacked' && NETDATA.chartLibraries.dygraph.isLogScale(state) === true) state.tmp.dygraph_chart_type = 'area';
+
+        var highlightCircleSize = (NETDATA.chartLibraries.dygraph.isSparkline(state) === true)?3:4;
+
+        var smooth = (NETDATA.dygraph.smooth === true)
+            ?(NETDATA.dataAttributeBoolean(state.element, 'dygraph-smooth', (state.tmp.dygraph_chart_type === 'line' && NETDATA.chartLibraries.dygraph.isSparkline(state) === false)))
+            :false;
+
+        state.tmp.dygraph_include_zero = NETDATA.dataAttribute(state.element, 'dygraph-includezero', (state.tmp.dygraph_chart_type === 'stacked'));
+        var drawAxis = NETDATA.dataAttributeBoolean(state.element, 'dygraph-drawaxis', true);
+
+        state.tmp.dygraph_options = {
+            colors:                 NETDATA.dataAttribute(state.element, 'dygraph-colors', state.chartColors()),
+
+            // leave a few pixels empty on the right of the chart
+            rightGap:               NETDATA.dataAttribute(state.element, 'dygraph-rightgap', 5),
+            showRangeSelector:      NETDATA.dataAttributeBoolean(state.element, 'dygraph-showrangeselector', false),
+            showRoller:             NETDATA.dataAttributeBoolean(state.element, 'dygraph-showroller', false),
+            title:                  NETDATA.dataAttribute(state.element, 'dygraph-title', state.title),
+            titleHeight:            NETDATA.dataAttribute(state.element, 'dygraph-titleheight', 19),
+            legend:                 NETDATA.dataAttribute(state.element, 'dygraph-legend', 'always'), // we need this to get selection events
+            labels:                 data.result.labels,
+            labelsDiv:              NETDATA.dataAttribute(state.element, 'dygraph-labelsdiv', state.element_legend_childs.hidden),
+            //labelsDivStyles:        NETDATA.dataAttribute(state.element, 'dygraph-labelsdivstyles', { 'fontSize':'1px' }),
+            //labelsDivWidth:         NETDATA.dataAttribute(state.element, 'dygraph-labelsdivwidth', state.chartWidth() - 70),
+            labelsSeparateLines:    NETDATA.dataAttributeBoolean(state.element, 'dygraph-labelsseparatelines', true),
+            labelsShowZeroValues:   (NETDATA.chartLibraries.dygraph.isLogScale(state) === true)?false:NETDATA.dataAttributeBoolean(state.element, 'dygraph-labelsshowzerovalues', true),
+            labelsKMB:              false,
+            labelsKMG2:             false,
+            showLabelsOnHighlight:  NETDATA.dataAttributeBoolean(state.element, 'dygraph-showlabelsonhighlight', true),
+            hideOverlayOnMouseOut:  NETDATA.dataAttributeBoolean(state.element, 'dygraph-hideoverlayonmouseout', true),
+            includeZero:            state.tmp.dygraph_include_zero,
+            xRangePad:              NETDATA.dataAttribute(state.element, 'dygraph-xrangepad', 0),
+            yRangePad:              NETDATA.dataAttribute(state.element, 'dygraph-yrangepad', 1),
+            valueRange:             NETDATA.dataAttribute(state.element, 'dygraph-valuerange', [ null, null ]),
+            ylabel:                 state.units_current, // (state.units_desired === 'auto')?"":state.units_current,
+            yLabelWidth:            NETDATA.dataAttribute(state.element, 'dygraph-ylabelwidth', 12),
+
+                                    // the function to plot the chart
+            plotter:                null,
+
+                                    // The width of the lines connecting data points.
+                                    // This can be used to increase the contrast or some graphs.
+            strokeWidth:            NETDATA.dataAttribute(state.element, 'dygraph-strokewidth', ((state.tmp.dygraph_chart_type === 'stacked')?0.1:((smooth === true)?1.5:0.7))),
+            strokePattern:          NETDATA.dataAttribute(state.element, 'dygraph-strokepattern', undefined),
+
+                                    // The size of the dot to draw on each point in pixels (see drawPoints).
+                                    // A dot is always drawn when a point is "isolated",
+                                    // i.e. there is a missing point on either side of it.
+                                    // This also controls the size of those dots.
+            drawPoints:             NETDATA.dataAttributeBoolean(state.element, 'dygraph-drawpoints', false),
+
+                                    // Draw points at the edges of gaps in the data.
+                                    // This improves visibility of small data segments or other data irregularities.
+            drawGapEdgePoints:      NETDATA.dataAttributeBoolean(state.element, 'dygraph-drawgapedgepoints', true),
+            connectSeparatedPoints: (NETDATA.chartLibraries.dygraph.isLogScale(state) === true)?false:NETDATA.dataAttributeBoolean(state.element, 'dygraph-connectseparatedpoints', false),
+            pointSize:              NETDATA.dataAttribute(state.element, 'dygraph-pointsize', 1),
+
+                                    // enabling this makes the chart with little square lines
+            stepPlot:               NETDATA.dataAttributeBoolean(state.element, 'dygraph-stepplot', false),
+
+                                    // Draw a border around graph lines to make crossing lines more easily
+                                    // distinguishable. Useful for graphs with many lines.
+            strokeBorderColor:      NETDATA.dataAttribute(state.element, 'dygraph-strokebordercolor', NETDATA.themes.current.background),
+            strokeBorderWidth:      NETDATA.dataAttribute(state.element, 'dygraph-strokeborderwidth', (state.tmp.dygraph_chart_type === 'stacked')?0.0:0.0),
+            fillGraph:              NETDATA.dataAttribute(state.element, 'dygraph-fillgraph', (state.tmp.dygraph_chart_type === 'area' || state.tmp.dygraph_chart_type === 'stacked')),
+            fillAlpha:              NETDATA.dataAttribute(state.element, 'dygraph-fillalpha',
+                                    ((state.tmp.dygraph_chart_type === 'stacked')
+                                        ?NETDATA.options.current.color_fill_opacity_stacked
+                                        :NETDATA.options.current.color_fill_opacity_area)
+                                    ),
+            stackedGraph:           NETDATA.dataAttribute(state.element, 'dygraph-stackedgraph', (state.tmp.dygraph_chart_type === 'stacked')),
+            stackedGraphNaNFill:    NETDATA.dataAttribute(state.element, 'dygraph-stackedgraphnanfill', 'none'),
+            drawAxis:               drawAxis,
+            axisLabelFontSize:      NETDATA.dataAttribute(state.element, 'dygraph-axislabelfontsize', 10),
+            axisLineColor:          NETDATA.dataAttribute(state.element, 'dygraph-axislinecolor', NETDATA.themes.current.axis),
+            axisLineWidth:          NETDATA.dataAttribute(state.element, 'dygraph-axislinewidth', 1.0),
+            drawGrid:               NETDATA.dataAttributeBoolean(state.element, 'dygraph-drawgrid', true),
+            gridLinePattern:        NETDATA.dataAttribute(state.element, 'dygraph-gridlinepattern', null),
+            gridLineWidth:          NETDATA.dataAttribute(state.element, 'dygraph-gridlinewidth', 1.0),
+            gridLineColor:          NETDATA.dataAttribute(state.element, 'dygraph-gridlinecolor', NETDATA.themes.current.grid),
+            maxNumberWidth:         NETDATA.dataAttribute(state.element, 'dygraph-maxnumberwidth', 8),
+            sigFigs:                NETDATA.dataAttribute(state.element, 'dygraph-sigfigs', null),
+            digitsAfterDecimal:     NETDATA.dataAttribute(state.element, 'dygraph-digitsafterdecimal', 2),
+            valueFormatter:         NETDATA.dataAttribute(state.element, 'dygraph-valueformatter', undefined),
+            highlightCircleSize:    NETDATA.dataAttribute(state.element, 'dygraph-highlightcirclesize', highlightCircleSize),
+            highlightSeriesOpts:    NETDATA.dataAttribute(state.element, 'dygraph-highlightseriesopts', null), // TOO SLOW: { strokeWidth: 1.5 },
+            highlightSeriesBackgroundAlpha: NETDATA.dataAttribute(state.element, 'dygraph-highlightseriesbackgroundalpha', null), // TOO SLOW: (state.tmp.dygraph_chart_type === 'stacked')?0.7:0.5,
+            pointClickCallback:     NETDATA.dataAttribute(state.element, 'dygraph-pointclickcallback', undefined),
+            visibility:             state.dimensions_visibility.selected2BooleanArray(state.data.dimension_names),
+            logscale:               (NETDATA.chartLibraries.dygraph.isLogScale(state) === true)?'y':undefined,
+
+            axes: {
+                x: {
+                    pixelsPerLabel: NETDATA.dataAttribute(state.element, 'dygraph-xpixelsperlabel', 50),
+                    ticker: Dygraph.dateTicker,
+                    axisLabelWidth: NETDATA.dataAttribute(state.element, 'dygraph-xaxislabelwidth', 60),
+                    drawAxis: NETDATA.dataAttributeBoolean(state.element, 'dygraph-drawxaxis', drawAxis),
+                    axisLabelFormatter: function (d, gran) {
+                        void(gran);
+                        return NETDATA.dateTime.xAxisTimeString(d);
+                    }
+                },
+                y: {
+                    logscale: (NETDATA.chartLibraries.dygraph.isLogScale(state) === true)?true:undefined,
+                    pixelsPerLabel: NETDATA.dataAttribute(state.element, 'dygraph-ypixelsperlabel', 15),
+                    axisLabelWidth: NETDATA.dataAttribute(state.element, 'dygraph-yaxislabelwidth', 50),
+                    drawAxis: NETDATA.dataAttributeBoolean(state.element, 'dygraph-drawyaxis', drawAxis),
+                    axisLabelFormatter: function (y) {
+
+                        // unfortunately, we have to call this every single time
+                        state.legendFormatValueDecimalsFromMinMax(
+                            this.axes_[0].extremeRange[0],
+                            this.axes_[0].extremeRange[1]
+                        );
+
+                        var old_units = this.user_attrs_.ylabel;
+                        var v = state.legendFormatValue(y);
+                        var new_units = state.units_current;
+
+                        if(state.units_desired === 'auto' && typeof old_units !== 'undefined' && new_units !== old_units && !NETDATA.chartLibraries.dygraph.isSparkline(state)) {
+                            // console.log(this);
+                            // state.log('units discrepancy: old = ' + old_units + ', new = ' + new_units);
+                            var len = this.plugins_.length;
+                            while(len--) {
+                                // console.log(this.plugins_[len]);
+                                if(typeof this.plugins_[len].plugin.ylabel_div_ !== 'undefined'
+                                    && this.plugins_[len].plugin.ylabel_div_ !== null
+                                    && typeof this.plugins_[len].plugin.ylabel_div_.children !== 'undefined'
+                                    && this.plugins_[len].plugin.ylabel_div_.children !== null
+                                    && typeof this.plugins_[len].plugin.ylabel_div_.children[0].children !== 'undefined'
+                                    && this.plugins_[len].plugin.ylabel_div_.children[0].children !== null
+                                ) {
+                                    this.plugins_[len].plugin.ylabel_div_.children[0].children[0].innerHTML = new_units;
+                                    this.user_attrs_.ylabel = new_units;
+                                    break;
+                                }
+                            }
+
+                            if(len < 0)
+                                state.log('units discrepancy, but cannot find dygraphs div to change: old = ' + old_units + ', new = ' + new_units);
+                        }
+
+                        return v;
+                    }
+                }
+            },
+            legendFormatter: function(data) {
+                if(state.tmp.dygraph_mouse_down === true)
+                    return;
+
+                var elements = state.element_legend_childs;
+
+                // if the hidden div is not there
+                // we are not managing the legend
+                if(elements.hidden === null) return;
+
+                if (typeof data.x !== 'undefined') {
+                    state.legendSetDate(data.x);
+                    var i = data.series.length;
+                    while(i--) {
+                        var series = data.series[i];
+                        if(series.isVisible === true)
+                            state.legendSetLabelValue(series.label, series.y);
+                        else
+                            state.legendSetLabelValue(series.label, null);
+                    }
+                }
+
+                return '';
+            },
+            drawCallback: function(dygraph, is_initial) {
+
+                // the user has panned the chart and this is called to re-draw the chart
+                // 1. refresh this chart by adding data to it
+                // 2. notify all the other charts about the update they need
+
+                // to prevent an infinite loop (feedback), we use
+                //     state.tmp.dygraph_user_action
+                // - when true, this is initiated by a user
+                // - when false, this is feedback
+
+                if(state.current.name !== 'auto' && state.tmp.dygraph_user_action === true) {
+                    state.tmp.dygraph_user_action = false;
+
+                    var x_range = dygraph.xAxisRange();
+                    var after = Math.round(x_range[0]);
+                    var before = Math.round(x_range[1]);
+
+                    if(NETDATA.options.debug.dygraph === true)
+                        state.log('dygraphDrawCallback(dygraph, ' + is_initial + '): mode ' + state.current.name + ' ' + (after / 1000).toString() + ' - ' + (before / 1000).toString());
+                        //console.log(state);
+
+                    if(before <= state.netdata_last && after >= state.netdata_first)
+                        // update only when we are within the data limits
+                        state.updateChartPanOrZoom(after, before);
+                }
+            },
+            zoomCallback: function(minDate, maxDate, yRanges) {
+
+                // the user has selected a range on the chart
+                // 1. refresh this chart by adding data to it
+                // 2. notify all the other charts about the update they need
+
+                void(yRanges);
+
+                if(NETDATA.options.debug.dygraph === true)
+                    state.log('dygraphZoomCallback(): ' + state.current.name);
+
+                NETDATA.globalSelectionSync.stop();
+                NETDATA.globalSelectionSync.delay();
+                state.setMode('zoom');
+
+                // refresh it to the greatest possible zoom level
+                state.tmp.dygraph_user_action = true;
+                state.tmp.dygraph_force_zoom = true;
+                state.updateChartPanOrZoom(minDate, maxDate);
+            },
+            highlightCallback: function(event, x, points, row, seriesName) {
+                void(seriesName);
+
+                state.pauseChart();
+
+                // there is a bug in dygraph when the chart is zoomed enough
+                // the time it thinks is selected is wrong
+                // here we calculate the time t based on the row number selected
+                // which is ok
+                // var t = state.data_after + row * state.data_update_every;
+                // console.log('row = ' + row + ', x = ' + x + ', t = ' + t + ' ' + ((t === x)?'SAME':(Math.abs(x-t)<=state.data_update_every)?'SIMILAR':'DIFFERENT') + ', rows in db: ' + state.data_points + ' visible(x) = ' + state.timeIsVisible(x) + ' visible(t) = ' + state.timeIsVisible(t) + ' r(x) = ' + state.calculateRowForTime(x) + ' r(t) = ' + state.calculateRowForTime(t) + ' range: ' + state.data_after + ' - ' + state.data_before + ' real: ' + state.data.after + ' - ' + state.data.before + ' every: ' + state.data_update_every);
+
+                if(state.tmp.dygraph_mouse_down !== true)
+                    NETDATA.globalSelectionSync.sync(state, x);
+
+                // fix legend zIndex using the internal structures of dygraph legend module
+                // this works, but it is a hack!
+                // state.tmp.dygraph_instance.plugins_[0].plugin.legend_div_.style.zIndex = 10000;
+            },
+            unhighlightCallback: function(event) {
+                void(event);
+
+                if(state.tmp.dygraph_mouse_down === true)
+                    return;
+
+                if(NETDATA.options.debug.dygraph === true || state.debug === true)
+                    state.log('dygraphUnhighlightCallback()');
+
+                state.unpauseChart();
+                NETDATA.globalSelectionSync.stop();
+            },
+            underlayCallback: function(canvas, area, g) {
+
+                // the chart is about to be drawn
+                // this function renders global highlighted time-frame
+
+                if(NETDATA.globalChartUnderlay.isActive()) {
+                    var after = NETDATA.globalChartUnderlay.after;
+                    var before = NETDATA.globalChartUnderlay.before;
+
+                    if(after < state.view_after)
+                        after = state.view_after;
+
+                    if(before > state.view_before)
+                        before = state.view_before;
+
+                    if(after < before) {
+                        var bottom_left = g.toDomCoords(after, -20);
+                        var top_right = g.toDomCoords(before, +20);
+
+                        var left = bottom_left[0];
+                        var right = top_right[0];
+
+                        canvas.fillStyle = NETDATA.themes.current.highlight;
+                        canvas.fillRect(left, area.y, right - left, area.h);
+                    }
+                }
+            },
+            interactionModel : {
+                mousedown: function(event, dygraph, context) {
+                    if(NETDATA.options.debug.dygraph === true || state.debug === true)
+                        state.log('interactionModel.mousedown()');
+
+                    state.tmp.dygraph_user_action = true;
+
+                    if(NETDATA.options.debug.dygraph === true)
+                        state.log('dygraphMouseDown()');
+
+                    // Right-click should not initiate anything.
+                    if(event.button && event.button === 2) return;
+
+                    NETDATA.globalSelectionSync.stop();
+                    NETDATA.globalSelectionSync.delay();
+
+                    state.tmp.dygraph_mouse_down = true;
+                    context.initializeMouseDown(event, dygraph, context);
+
+                    //console.log(event);
+                    if(event.button && event.button === 1) {
+                        if (event.shiftKey) {
+                            //console.log('middle mouse button dragging (PAN)');
+
+                            state.setMode('pan');
+                            // NETDATA.globalSelectionSync.delay();
+                            state.tmp.dygraph_highlight_after = null;
+                            Dygraph.startPan(event, dygraph, context);
+                        }
+                        else if(event.altKey || event.ctrlKey || event.metaKey) {
+                            //console.log('middle mouse button highlight');
+
+                            if (!(event.offsetX && event.offsetY)) {
+                                event.offsetX = event.layerX - event.target.offsetLeft;
+                                event.offsetY = event.layerY - event.target.offsetTop;
+                            }
+                            state.tmp.dygraph_highlight_after = dygraph.toDataXCoord(event.offsetX);
+                            Dygraph.startZoom(event, dygraph, context);
+                        }
+                        else {
+                            //console.log('middle mouse button selection for zoom (ZOOM)');
+
+                            state.setMode('zoom');
+                            // NETDATA.globalSelectionSync.delay();
+                            state.tmp.dygraph_highlight_after = null;
+                            Dygraph.startZoom(event, dygraph, context);
+                        }
+                    }
+                    else {
+                        if (event.shiftKey) {
+                            //console.log('left mouse button selection for zoom (ZOOM)');
+
+                            state.setMode('zoom');
+                            // NETDATA.globalSelectionSync.delay();
+                            state.tmp.dygraph_highlight_after = null;
+                            Dygraph.startZoom(event, dygraph, context);
+                        }
+                        else if(event.altKey || event.ctrlKey || event.metaKey) {
+                            //console.log('left mouse button highlight');
+
+                            if (!(event.offsetX && event.offsetY)) {
+                                event.offsetX = event.layerX - event.target.offsetLeft;
+                                event.offsetY = event.layerY - event.target.offsetTop;
+                            }
+                            state.tmp.dygraph_highlight_after = dygraph.toDataXCoord(event.offsetX);
+                            Dygraph.startZoom(event, dygraph, context);
+                        }
+                        else {
+                            //console.log('left mouse button dragging (PAN)');
+
+                            state.setMode('pan');
+                            // NETDATA.globalSelectionSync.delay();
+                            state.tmp.dygraph_highlight_after = null;
+                            Dygraph.startPan(event, dygraph, context);
+                        }
+                    }
+                },
+                mousemove: function(event, dygraph, context) {
+                    if(NETDATA.options.debug.dygraph === true || state.debug === true)
+                        state.log('interactionModel.mousemove()');
+
+                    if(state.tmp.dygraph_highlight_after !== null) {
+                        //console.log('highlight selection...');
+
+                        NETDATA.globalSelectionSync.stop();
+                        NETDATA.globalSelectionSync.delay();
+
+                        state.tmp.dygraph_user_action = true;
+                        Dygraph.moveZoom(event, dygraph, context);
+                        event.preventDefault();
+                    }
+                    else if(context.isPanning) {
+                        //console.log('panning...');
+
+                        NETDATA.globalSelectionSync.stop();
+                        NETDATA.globalSelectionSync.delay();
+
+                        state.tmp.dygraph_user_action = true;
+                        //NETDATA.globalSelectionSync.stop();
+                        //NETDATA.globalSelectionSync.delay();
+                        state.setMode('pan');
+                        context.is2DPan = false;
+                        Dygraph.movePan(event, dygraph, context);
+                    }
+                    else if(context.isZooming) {
+                        //console.log('zooming...');
+
+                        NETDATA.globalSelectionSync.stop();
+                        NETDATA.globalSelectionSync.delay();
+
+                        state.tmp.dygraph_user_action = true;
+                        //NETDATA.globalSelectionSync.stop();
+                        //NETDATA.globalSelectionSync.delay();
+                        state.setMode('zoom');
+                        Dygraph.moveZoom(event, dygraph, context);
+                    }
+                },
+                mouseup: function(event, dygraph, context) {
+                    state.tmp.dygraph_mouse_down = false;
+
+                    if(NETDATA.options.debug.dygraph === true || state.debug === true)
+                        state.log('interactionModel.mouseup()');
+
+                    if(state.tmp.dygraph_highlight_after !== null) {
+                        //console.log('done highlight selection');
+
+                        NETDATA.globalSelectionSync.stop();
+                        NETDATA.globalSelectionSync.delay();
+
+                        if (!(event.offsetX && event.offsetY)){
+                            event.offsetX = event.layerX - event.target.offsetLeft;
+                            event.offsetY = event.layerY - event.target.offsetTop;
+                        }
+
+                        NETDATA.globalChartUnderlay.set(state
+                            , state.tmp.dygraph_highlight_after
+                            , dygraph.toDataXCoord(event.offsetX)
+                            , state.view_after
+                            , state.view_before
+                        );
+
+                        state.tmp.dygraph_highlight_after = null;
+
+                        context.isZooming = false;
+                        dygraph.clearZoomRect_();
+                        dygraph.drawGraph_(false);
+
+                        // refresh all the charts immediately
+                        NETDATA.options.auto_refresher_stop_until = 0;
+                    }
+                    else if (context.isPanning) {
+                        //console.log('done panning');
+
+                        NETDATA.globalSelectionSync.stop();
+                        NETDATA.globalSelectionSync.delay();
+
+                        state.tmp.dygraph_user_action = true;
+                        Dygraph.endPan(event, dygraph, context);
+
+                        // refresh all the charts immediately
+                        NETDATA.options.auto_refresher_stop_until = 0;
+                    }
+                    else if (context.isZooming) {
+                        //console.log('done zomming');
+
+                        NETDATA.globalSelectionSync.stop();
+                        NETDATA.globalSelectionSync.delay();
+
+                        state.tmp.dygraph_user_action = true;
+                        Dygraph.endZoom(event, dygraph, context);
+
+                        // refresh all the charts immediately
+                        NETDATA.options.auto_refresher_stop_until = 0;
+                    }
+                },
+                click: function(event, dygraph, context) {
+                    void(dygraph);
+                    void(context);
+
+                    if(NETDATA.options.debug.dygraph === true || state.debug === true)
+                        state.log('interactionModel.click()');
+
+                    event.preventDefault();
+                },
+                dblclick: function(event, dygraph, context) {
+                    void(event);
+                    void(dygraph);
+                    void(context);
+
+                    if(NETDATA.options.debug.dygraph === true || state.debug === true)
+                        state.log('interactionModel.dblclick()');
+                    NETDATA.resetAllCharts(state);
+                },
+                wheel: function(event, dygraph, context) {
+                    void(context);
+
+                    if(NETDATA.options.debug.dygraph === true || state.debug === true)
+                        state.log('interactionModel.wheel()');
+
+                    // Take the offset of a mouse event on the dygraph canvas and
+                    // convert it to a pair of percentages from the bottom left.
+                    // (Not top left, bottom is where the lower value is.)
+                    function offsetToPercentage(g, offsetX, offsetY) {
+                        // This is calculating the pixel offset of the leftmost date.
+                        var xOffset = g.toDomCoords(g.xAxisRange()[0], null)[0];
+                        var yar0 = g.yAxisRange(0);
+
+                        // This is calculating the pixel of the highest value. (Top pixel)
+                        var yOffset = g.toDomCoords(null, yar0[1])[1];
+
+                        // x y w and h are relative to the corner of the drawing area,
+                        // so that the upper corner of the drawing area is (0, 0).
+                        var x = offsetX - xOffset;
+                        var y = offsetY - yOffset;
+
+                        // This is computing the rightmost pixel, effectively defining the
+                        // width.
+                        var w = g.toDomCoords(g.xAxisRange()[1], null)[0] - xOffset;
+
+                        // This is computing the lowest pixel, effectively defining the height.
+                        var h = g.toDomCoords(null, yar0[0])[1] - yOffset;
+
+                        // Percentage from the left.
+                        var xPct = w === 0 ? 0 : (x / w);
+                        // Percentage from the top.
+                        var yPct = h === 0 ? 0 : (y / h);
+
+                        // The (1-) part below changes it from "% distance down from the top"
+                        // to "% distance up from the bottom".
+                        return [xPct, (1-yPct)];
+                    }
+
+                    // Adjusts [x, y] toward each other by zoomInPercentage%
+                    // Split it so the left/bottom axis gets xBias/yBias of that change and
+                    // tight/top gets (1-xBias)/(1-yBias) of that change.
+                    //
+                    // If a bias is missing it splits it down the middle.
+                    function zoomRange(g, zoomInPercentage, xBias, yBias) {
+                        xBias = xBias || 0.5;
+                        yBias = yBias || 0.5;
+
+                        function adjustAxis(axis, zoomInPercentage, bias) {
+                            var delta = axis[1] - axis[0];
+                            var increment = delta * zoomInPercentage;
+                            var foo = [increment * bias, increment * (1-bias)];
+
+                            return [ axis[0] + foo[0], axis[1] - foo[1] ];
+                        }
+
+                        var yAxes = g.yAxisRanges();
+                        var newYAxes = [];
+                        for (var i = 0; i < yAxes.length; i++) {
+                            newYAxes[i] = adjustAxis(yAxes[i], zoomInPercentage, yBias);
+                        }
+
+                        return adjustAxis(g.xAxisRange(), zoomInPercentage, xBias);
+                    }
+
+                    if(event.altKey || event.shiftKey) {
+                        state.tmp.dygraph_user_action = true;
+
+                        NETDATA.globalSelectionSync.stop();
+                        NETDATA.globalSelectionSync.delay();
+
+                        // http://dygraphs.com/gallery/interaction-api.js
+                        var normal_def;
+                        if(typeof event.wheelDelta === 'number' && !isNaN(event.wheelDelta))
+                            // chrome
+                            normal_def = event.wheelDelta / 40;
+                        else
+                            // firefox
+                            normal_def = event.deltaY * -1.2;
+
+                        var normal = (event.detail) ? event.detail * -1 : normal_def;
+                        var percentage = normal / 50;
+
+                        if (!(event.offsetX && event.offsetY)){
+                            event.offsetX = event.layerX - event.target.offsetLeft;
+                            event.offsetY = event.layerY - event.target.offsetTop;
+                        }
+
+                        var percentages = offsetToPercentage(dygraph, event.offsetX, event.offsetY);
+                        var xPct = percentages[0];
+                        var yPct = percentages[1];
+
+                        var new_x_range = zoomRange(dygraph, percentage, xPct, yPct);
+                        var after = new_x_range[0];
+                        var before = new_x_range[1];
+
+                        var first = state.netdata_first + state.data_update_every;
+                        var last = state.netdata_last + state.data_update_every;
+
+                        if(before > last) {
+                            after -= (before - last);
+                            before = last;
+                        }
+                        if(after < first) {
+                            after = first;
+                        }
+
+                        state.setMode('zoom');
+                        state.updateChartPanOrZoom(after, before, function() {
+                            dygraph.updateOptions({ dateWindow: [ after, before ] });
+                        });
+
+                        event.preventDefault();
+                    }
+                },
+                touchstart: function(event, dygraph, context) {
+                    state.tmp.dygraph_mouse_down = true;
+
+                    if(NETDATA.options.debug.dygraph === true || state.debug === true)
+                        state.log('interactionModel.touchstart()');
+
+                    state.tmp.dygraph_user_action = true;
+                    state.setMode('zoom');
+                    state.pauseChart();
+
+                    NETDATA.globalSelectionSync.stop();
+                    NETDATA.globalSelectionSync.delay();
+
+                    Dygraph.defaultInteractionModel.touchstart(event, dygraph, context);
+
+                    // we overwrite the touch directions at the end, to overwrite
+                    // the internal default of dygraph
+                    context.touchDirections = { x: true, y: false };
+
+                    state.dygraph_last_touch_start = Date.now();
+                    state.dygraph_last_touch_move = 0;
+
+                    if(typeof event.touches[0].pageX === 'number')
+                        state.dygraph_last_touch_page_x = event.touches[0].pageX;
+                    else
+                        state.dygraph_last_touch_page_x = 0;
+                },
+                touchmove: function(event, dygraph, context) {
+                    if(NETDATA.options.debug.dygraph === true || state.debug === true)
+                        state.log('interactionModel.touchmove()');
+
+                    NETDATA.globalSelectionSync.stop();
+                    NETDATA.globalSelectionSync.delay();
+
+                    state.tmp.dygraph_user_action = true;
+                    Dygraph.defaultInteractionModel.touchmove(event, dygraph, context);
+
+                    state.dygraph_last_touch_move = Date.now();
+                },
+                touchend: function(event, dygraph, context) {
+                    state.tmp.dygraph_mouse_down = false;
+
+                    if(NETDATA.options.debug.dygraph === true || state.debug === true)
+                        state.log('interactionModel.touchend()');
+
+                    NETDATA.globalSelectionSync.stop();
+                    NETDATA.globalSelectionSync.delay();
+
+                    state.tmp.dygraph_user_action = true;
+                    Dygraph.defaultInteractionModel.touchend(event, dygraph, context);
+
+                    // if it didn't move, it is a selection
+                    if(state.dygraph_last_touch_move === 0 && state.dygraph_last_touch_page_x !== 0) {
+                        NETDATA.globalSelectionSync.dont_sync_before = 0;
+                        NETDATA.globalSelectionSync.setMaster(state);
+
+                        // internal api of dygraph
+                        var pct = (state.dygraph_last_touch_page_x - (dygraph.plotter_.area.x + state.element.getBoundingClientRect().left)) / dygraph.plotter_.area.w;
+                        console.log('pct: ' + pct.toString());
+
+                        var t = Math.round(state.view_after + (state.view_before - state.view_after) * pct);
+                        if(NETDATA.dygraphSetSelection(state, t) === true) {
+                            NETDATA.globalSelectionSync.sync(state, t);
+                        }
+                    }
+
+                    // if it was double tap within double click time, reset the charts
+                    var now = Date.now();
+                    if(typeof state.dygraph_last_touch_end !== 'undefined') {
+                        if(state.dygraph_last_touch_move === 0) {
+                            var dt = now - state.dygraph_last_touch_end;
+                            if(dt <= NETDATA.options.current.double_click_speed)
+                                NETDATA.resetAllCharts(state);
+                        }
+                    }
+
+                    // remember the timestamp of the last touch end
+                    state.dygraph_last_touch_end = now;
+
+                    // refresh all the charts immediately
+                    NETDATA.options.auto_refresher_stop_until = 0;
+                }
+            }
+        };
+
+        if(NETDATA.chartLibraries.dygraph.isLogScale(state) === true) {
+            if(Array.isArray(state.tmp.dygraph_options.valueRange) && state.tmp.dygraph_options.valueRange[0] <= 0)
+                state.tmp.dygraph_options.valueRange[0] = null;
+        }
+
+        if(NETDATA.chartLibraries.dygraph.isSparkline(state) === true) {
+            state.tmp.dygraph_options.drawGrid = false;
+            state.tmp.dygraph_options.drawAxis = false;
+            state.tmp.dygraph_options.title = undefined;
+            state.tmp.dygraph_options.ylabel = undefined;
+            state.tmp.dygraph_options.yLabelWidth = 0;
+            //state.tmp.dygraph_options.labelsDivWidth = 120;
+            //state.tmp.dygraph_options.labelsDivStyles.width = '120px';
+            state.tmp.dygraph_options.labelsSeparateLines = true;
+            state.tmp.dygraph_options.rightGap = 0;
+            state.tmp.dygraph_options.yRangePad = 1;
+            state.tmp.dygraph_options.axes.x.drawAxis = false;
+            state.tmp.dygraph_options.axes.y.drawAxis = false;
+        }
+
+        if(smooth === true) {
+            state.tmp.dygraph_smooth_eligible = true;
+
+            if(NETDATA.options.current.smooth_plot === true)
+                state.tmp.dygraph_options.plotter = smoothPlotter;
+        }
+        else state.tmp.dygraph_smooth_eligible = false;
+
+        if(netdataSnapshotData !== null && NETDATA.globalPanAndZoom.isActive() === true && NETDATA.globalPanAndZoom.isMaster(state) === false) {
+            // pan and zoom on snapshots
+            state.tmp.dygraph_options.dateWindow = [ NETDATA.globalPanAndZoom.force_after_ms, NETDATA.globalPanAndZoom.force_before_ms ];
+            //state.tmp.dygraph_options.isZoomedIgnoreProgrammaticZoom = true;
+        }
+
+        state.tmp.dygraph_instance = new Dygraph(state.element_chart,
+            data.result.data, state.tmp.dygraph_options);
+
+        state.tmp.dygraph_force_zoom = false;
+        state.tmp.dygraph_user_action = false;
+        state.tmp.dygraph_last_rendered = Date.now();
+        state.tmp.dygraph_highlight_after = null;
+
+        if(state.tmp.dygraph_options.valueRange[0] === null && state.tmp.dygraph_options.valueRange[1] === null) {
+            if (typeof state.tmp.dygraph_instance.axes_[0].extremeRange !== 'undefined') {
+                state.tmp.__commonMin = NETDATA.dataAttribute(state.element, 'common-min', null);
+                state.tmp.__commonMax = NETDATA.dataAttribute(state.element, 'common-max', null);
+            }
+            else {
+                state.log('incompatible version of Dygraph detected');
+                state.tmp.__commonMin = null;
+                state.tmp.__commonMax = null;
+            }
+        }
+        else {
+            // if the user gave a valueRange, respect it
+            state.tmp.__commonMin = null;
+            state.tmp.__commonMax = null;
+        }
+
+        return true;
+    };
+
+    // ----------------------------------------------------------------------------------------------------------------
+    // morris
+
+    NETDATA.morrisInitialize = function(callback) {
+        if(typeof netdataNoMorris === 'undefined' || !netdataNoMorris) {
+
+            // morris requires raphael
+            if(!NETDATA.chartLibraries.raphael.initialized) {
+                if(NETDATA.chartLibraries.raphael.enabled) {
+                    NETDATA.raphaelInitialize(function() {
+                        NETDATA.morrisInitialize(callback);
+                    });
+                }
+                else {
+                    NETDATA.chartLibraries.morris.enabled = false;
+                    if(typeof callback === "function")
+                        return callback();
+                }
+            }
+            else {
+                NETDATA._loadCSS(NETDATA.morris_css);
+
+                $.ajax({
+                    url: NETDATA.morris_js,
+                    cache: true,
+                    dataType: "script",
+                    xhrFields: { withCredentials: true } // required for the cookie
+                })
+                .done(function() {
+                    NETDATA.registerChartLibrary('morris', NETDATA.morris_js);
+                })
+                .fail(function() {
+                    NETDATA.chartLibraries.morris.enabled = false;
+                    NETDATA.error(100, NETDATA.morris_js);
+                })
+                .always(function() {
+                    if(typeof callback === "function")
+                        return callback();
+                });
+            }
+        }
+        else {
+            NETDATA.chartLibraries.morris.enabled = false;
+            if(typeof callback === "function")
+                return callback();
+        }
+    };
+
+    NETDATA.morrisChartUpdate = function(state, data) {
+        state.morris_instance.setData(data.result.data);
+        return true;
+    };
+
+    NETDATA.morrisChartCreate = function(state, data) {
+
+        state.morris_options = {
+                element: state.element_chart.id,
+                data: data.result.data,
+                xkey: 'time',
+                ykeys: data.dimension_names,
+                labels: data.dimension_names,
+                lineWidth: 2,
+                pointSize: 3,
+                smooth: true,
+                hideHover: 'auto',
+                parseTime: true,
+                continuousLine: false,
+                behaveLikeLine: false
+        };
+
+        if(state.chart.chart_type === 'line')
+            state.morris_instance = new Morris.Line(state.morris_options);
+
+        else if(state.chart.chart_type === 'area') {
+            state.morris_options.behaveLikeLine = true;
+            state.morris_instance = new Morris.Area(state.morris_options);
+        }
+        else // stacked
+            state.morris_instance = new Morris.Area(state.morris_options);
+
+        return true;
+    };
+
+    // ----------------------------------------------------------------------------------------------------------------
+    // raphael
+
+    NETDATA.raphaelInitialize = function(callback) {
+        if(typeof netdataStopRaphael === 'undefined' || !netdataStopRaphael) {
+            $.ajax({
+                url: NETDATA.raphael_js,
+                cache: true,
+                dataType: "script",
+                xhrFields: { withCredentials: true } // required for the cookie
+            })
+            .done(function() {
+                NETDATA.registerChartLibrary('raphael', NETDATA.raphael_js);
+            })
+            .fail(function() {
+                NETDATA.chartLibraries.raphael.enabled = false;
+                NETDATA.error(100, NETDATA.raphael_js);
+            })
+            .always(function() {
+                if(typeof callback === "function")
+                    return callback();
+            });
+        }
+        else {
+            NETDATA.chartLibraries.raphael.enabled = false;
+            if(typeof callback === "function")
+                return callback();
+        }
+    };
+
+    NETDATA.raphaelChartUpdate = function(state, data) {
+        $(state.element_chart).raphael(data.result, {
+            width: state.chartWidth(),
+            height: state.chartHeight()
+        });
+
+        return false;
+    };
+
+    NETDATA.raphaelChartCreate = function(state, data) {
+        $(state.element_chart).raphael(data.result, {
+            width: state.chartWidth(),
+            height: state.chartHeight()
+        });
+
+        return false;
+    };
+
+    // ----------------------------------------------------------------------------------------------------------------
+    // C3
+
+    NETDATA.c3Initialize = function(callback) {
+        if(typeof netdataNoC3 === 'undefined' || !netdataNoC3) {
+
+            // C3 requires D3
+            if(!NETDATA.chartLibraries.d3.initialized) {
+                if(NETDATA.chartLibraries.d3.enabled) {
+                    NETDATA.d3Initialize(function() {
+                        NETDATA.c3Initialize(callback);
+                    });
+                }
+                else {
+                    NETDATA.chartLibraries.c3.enabled = false;
+                    if(typeof callback === "function")
+                        return callback();
+                }
+            }
+            else {
+                NETDATA._loadCSS(NETDATA.c3_css);
+
+                $.ajax({
+                    url: NETDATA.c3_js,
+                    cache: true,
+                    dataType: "script",
+                    xhrFields: { withCredentials: true } // required for the cookie
+                })
+                .done(function() {
+                    NETDATA.registerChartLibrary('c3', NETDATA.c3_js);
+                })
+                .fail(function() {
+                    NETDATA.chartLibraries.c3.enabled = false;
+                    NETDATA.error(100, NETDATA.c3_js);
+                })
+                .always(function() {
+                    if(typeof callback === "function")
+                        return callback();
+                });
+            }
+        }
+        else {
+            NETDATA.chartLibraries.c3.enabled = false;
+            if(typeof callback === "function")
+                return callback();
+        }
+    };
+
+    NETDATA.c3ChartUpdate = function(state, data) {
+        state.c3_instance.destroy();
+        return NETDATA.c3ChartCreate(state, data);
+
+        //state.c3_instance.load({
+        //  rows: data.result,
+        //  unload: true
+        //});
+
+        //return true;
+    };
+
+    NETDATA.c3ChartCreate = function(state, data) {
+
+        state.element_chart.id = 'c3-' + state.uuid;
+        // console.log('id = ' + state.element_chart.id);
+
+        state.c3_instance = c3.generate({
+            bindto: '#' + state.element_chart.id,
+            size: {
+                width: state.chartWidth(),
+                height: state.chartHeight()
+            },
+            color: {
+                pattern: state.chartColors()
+            },
+            data: {
+                x: 'time',
+                rows: data.result,
+                type: (state.chart.chart_type === 'line')?'spline':'area-spline'
+            },
+            axis: {
+                x: {
+                    type: 'timeseries',
+                    tick: {
+                        format: function(x) {
+                            return NETDATA.dateTime.xAxisTimeString(x);
+                        }
+                    }
+                }
+            },
+            grid: {
+                x: {
+                    show: true
+                },
+                y: {
+                    show: true
+                }
+            },
+            point: {
+                show: false
+            },
+            line: {
+                connectNull: false
+            },
+            transition: {
+                duration: 0
+            },
+            interaction: {
+                enabled: true
+            }
+        });
+
+        // console.log(state.c3_instance);
+
+        return true;
+    };
+
+    // ----------------------------------------------------------------------------------------------------------------
+    // d3pie
+
+    NETDATA.d3pieInitialize = function(callback) {
+        if(typeof netdataNoD3pie === 'undefined' || !netdataNoD3pie) {
+
+            // d3pie requires D3
+            if(!NETDATA.chartLibraries.d3.initialized) {
+                if(NETDATA.chartLibraries.d3.enabled) {
+                    NETDATA.d3Initialize(function() {
+                        NETDATA.d3pieInitialize(callback);
+                    });
+                }
+                else {
+                    NETDATA.chartLibraries.d3pie.enabled = false;
+                    if(typeof callback === "function")
+                        return callback();
+                }
+            }
+            else {
+                $.ajax({
+                    url: NETDATA.d3pie_js,
+                    cache: true,
+                    dataType: "script",
+                    xhrFields: { withCredentials: true } // required for the cookie
+                })
+                    .done(function() {
+                        NETDATA.registerChartLibrary('d3pie', NETDATA.d3pie_js);
+                    })
+                    .fail(function() {
+                        NETDATA.chartLibraries.d3pie.enabled = false;
+                        NETDATA.error(100, NETDATA.d3pie_js);
+                    })
+                    .always(function() {
+                        if(typeof callback === "function")
+                            return callback();
+                    });
+            }
+        }
+        else {
+            NETDATA.chartLibraries.d3pie.enabled = false;
+            if(typeof callback === "function")
+                return callback();
+        }
+    };
+
+    NETDATA.d3pieSetContent = function(state, data, index) {
+        state.legendFormatValueDecimalsFromMinMax(
+            data.min,
+            data.max
+        );
+
+        var content = [];
+        var colors = state.chartColors();
+        var len = data.result.labels.length;
+        for(var i = 1; i < len ; i++) {
+            var label = data.result.labels[i];
+            var value = data.result.data[index][label];
+            var color = colors[i - 1];
+
+            if(value !== null && value > 0) {
+                content.push({
+                    label: label,
+                    value: value,
+                    color: color
+                });
+            }
+        }
+
+        if(content.length === 0)
+            content.push({
+                label: 'no data',
+                value: 100,
+                color: '#666666'
+            });
+
+        state.tmp.d3pie_last_slot = index;
+        return content;
+    };
+
+    NETDATA.d3pieDateRange = function(state, data, index) {
+        var dt = Math.round((data.before - data.after + 1) / data.points);
+        var dt_str = NETDATA.seconds4human(dt);
+
+        var before = data.result.data[index].time;
+        var after = before - (dt * 1000);
+
+        var d1 = NETDATA.dateTime.localeDateString(after);
+        var t1 = NETDATA.dateTime.localeTimeString(after);
+        var d2 = NETDATA.dateTime.localeDateString(before);
+        var t2 = NETDATA.dateTime.localeTimeString(before);
+
+        if(d1 === d2)
+            return d1 + ' ' + t1 + ' to ' + t2 + ', ' + dt_str;
+
+        return d1 + ' ' + t1 + ' to ' + d2 + ' ' + t2 + ', ' + dt_str;
+    };
+
+    NETDATA.d3pieSetSelection = function(state, t) {
+        if(state.timeIsVisible(t) !== true)
+            return NETDATA.d3pieClearSelection(state, true);
+
+        var slot = state.calculateRowForTime(t);
+        slot = state.data.result.data.length - slot - 1;
+
+        if(slot < 0 || slot >= state.data.result.length)
+            return NETDATA.d3pieClearSelection(state, true);
+
+        if(state.tmp.d3pie_last_slot === slot) {
+            // we already show this slot, don't do anything
+            return true;
+        }
+
+        if(state.tmp.d3pie_timer === undefined) {
+            state.tmp.d3pie_timer = NETDATA.timeout.set(function() {
+                state.tmp.d3pie_timer = undefined;
+                NETDATA.d3pieChange(state, NETDATA.d3pieSetContent(state, state.data, slot), NETDATA.d3pieDateRange(state, state.data, slot));
+            }, 0);
+        }
+
+        return true;
+    };
+
+    NETDATA.d3pieClearSelection = function(state, force) {
+        if(typeof state.tmp.d3pie_timer !== 'undefined') {
+            NETDATA.timeout.clear(state.tmp.d3pie_timer);
+            state.tmp.d3pie_timer = undefined;
+        }
+
+        if(state.isAutoRefreshable() === true && state.data !== null && force !== true) {
+            NETDATA.d3pieChartUpdate(state, state.data);
+        }
+        else {
+            if(state.tmp.d3pie_last_slot !== -1) {
+                state.tmp.d3pie_last_slot = -1;
+                NETDATA.d3pieChange(state, [{label: 'no data', value: 1, color: '#666666'}], 'no data available');
+            }
+        }
+
+        return true;
+    };
+
+    NETDATA.d3pieChange = function(state, content, footer) {
+        if(state.d3pie_forced_subtitle === null) {
+            //state.d3pie_instance.updateProp("header.subtitle.text", state.units_current);
+            state.d3pie_instance.options.header.subtitle.text = state.units_current;
+        }
+
+        if(state.d3pie_forced_footer === null) {
+            //state.d3pie_instance.updateProp("footer.text", footer);
+            state.d3pie_instance.options.footer.text = footer;
+        }
+
+        //state.d3pie_instance.updateProp("data.content", content);
+        state.d3pie_instance.options.data.content = content;
+        state.d3pie_instance.destroy();
+        state.d3pie_instance.recreate();
+        return true;
+    };
+
+    NETDATA.d3pieChartUpdate = function(state, data) {
+        return NETDATA.d3pieChange(state, NETDATA.d3pieSetContent(state, data, 0), NETDATA.d3pieDateRange(state, data, 0));
+    };
+
+    NETDATA.d3pieChartCreate = function(state, data) {
+
+        state.element_chart.id = 'd3pie-' + state.uuid;
+        // console.log('id = ' + state.element_chart.id);
+
+        var content = NETDATA.d3pieSetContent(state, data, 0);
+
+        state.d3pie_forced_title = NETDATA.dataAttribute(state.element, 'd3pie-title', null);
+        state.d3pie_forced_subtitle = NETDATA.dataAttribute(state.element, 'd3pie-subtitle', null);
+        state.d3pie_forced_footer = NETDATA.dataAttribute(state.element, 'd3pie-footer', null);
+
+        state.d3pie_options = {
+            header: {
+                title: {
+                    text: (state.d3pie_forced_title !== null) ? state.d3pie_forced_title : state.title,
+                    color: NETDATA.dataAttribute(state.element, 'd3pie-title-color', NETDATA.themes.current.d3pie.title),
+                    fontSize: NETDATA.dataAttribute(state.element, 'd3pie-title-fontsize', 12),
+                    fontWeight: NETDATA.dataAttribute(state.element, 'd3pie-title-fontweight', "bold"),
+                    font: NETDATA.dataAttribute(state.element, 'd3pie-title-font', "arial")
+                },
+                subtitle: {
+                    text: (state.d3pie_forced_subtitle !== null) ? state.d3pie_forced_subtitle : state.units_current,
+                    color: NETDATA.dataAttribute(state.element, 'd3pie-subtitle-color', NETDATA.themes.current.d3pie.subtitle),
+                    fontSize: NETDATA.dataAttribute(state.element, 'd3pie-subtitle-fontsize', 10),
+                    fontWeight: NETDATA.dataAttribute(state.element, 'd3pie-subtitle-fontweight', "normal"),
+                    font: NETDATA.dataAttribute(state.element, 'd3pie-subtitle-font', "arial")
+                },
+                titleSubtitlePadding: 1
+            },
+            footer: {
+                text: (state.d3pie_forced_footer !== null) ? state.d3pie_forced_footer : NETDATA.d3pieDateRange(state, data, 0),
+                color: NETDATA.dataAttribute(state.element, 'd3pie-footer-color', NETDATA.themes.current.d3pie.footer),
+                fontSize: NETDATA.dataAttribute(state.element, 'd3pie-footer-fontsize', 9),
+                fontWeight: NETDATA.dataAttribute(state.element, 'd3pie-footer-fontweight', "bold"),
+                font: NETDATA.dataAttribute(state.element, 'd3pie-footer-font', "arial"),
+                location: NETDATA.dataAttribute(state.element, 'd3pie-footer-location', "bottom-center") // bottom-left, bottom-center, bottom-right
+            },
+            size: {
+                canvasHeight: state.chartHeight(),
+                canvasWidth: state.chartWidth(),
+                pieInnerRadius: NETDATA.dataAttribute(state.element, 'd3pie-pieinnerradius', "45%"),
+                pieOuterRadius: NETDATA.dataAttribute(state.element, 'd3pie-pieouterradius', "80%")
+            },
+            data: {
+                // none, random, value-asc, value-desc, label-asc, label-desc
+                sortOrder: NETDATA.dataAttribute(state.element, 'd3pie-sortorder', "value-desc"),
+                smallSegmentGrouping: {
+                    enabled: NETDATA.dataAttributeBoolean(state.element, "d3pie-smallsegmentgrouping-enabled", false),
+                    value: NETDATA.dataAttribute(state.element, 'd3pie-smallsegmentgrouping-value', 1),
+                    // percentage, value
+                    valueType: NETDATA.dataAttribute(state.element, 'd3pie-smallsegmentgrouping-valuetype', "percentage"),
+                    label: NETDATA.dataAttribute(state.element, 'd3pie-smallsegmentgrouping-label', "other"),
+                    color: NETDATA.dataAttribute(state.element, 'd3pie-smallsegmentgrouping-color', NETDATA.themes.current.d3pie.other)
+                },
+
+                // REQUIRED! This is where you enter your pie data; it needs to be an array of objects
+                // of this form: { label: "label", value: 1.5, color: "#000000" } - color is optional
+                content: content
+            },
+            labels: {
+                outer: {
+                    // label, value, percentage, label-value1, label-value2, label-percentage1, label-percentage2
+                    format: NETDATA.dataAttribute(state.element, 'd3pie-labels-outer-format', "label-value1"),
+                    hideWhenLessThanPercentage: NETDATA.dataAttribute(state.element, 'd3pie-labels-outer-hidewhenlessthanpercentage', null),
+                    pieDistance: NETDATA.dataAttribute(state.element, 'd3pie-labels-outer-piedistance', 15)
+                },
+                inner: {
+                    // label, value, percentage, label-value1, label-value2, label-percentage1, label-percentage2
+                    format: NETDATA.dataAttribute(state.element, 'd3pie-labels-inner-format', "percentage"),
+                    hideWhenLessThanPercentage: NETDATA.dataAttribute(state.element, 'd3pie-labels-inner-hidewhenlessthanpercentage', 2)
+                },
+                mainLabel: {
+                    color: NETDATA.dataAttribute(state.element, 'd3pie-labels-mainLabel-color', NETDATA.themes.current.d3pie.mainlabel), // or 'segment' for dynamic color
+                    font: NETDATA.dataAttribute(state.element, 'd3pie-labels-mainLabel-font', "arial"),
+                    fontSize: NETDATA.dataAttribute(state.element, 'd3pie-labels-mainLabel-fontsize', 10),
+                    fontWeight: NETDATA.dataAttribute(state.element, 'd3pie-labels-mainLabel-fontweight', "normal")
+                },
+                percentage: {
+                    color: NETDATA.dataAttribute(state.element, 'd3pie-labels-percentage-color', NETDATA.themes.current.d3pie.percentage),
+                    font: NETDATA.dataAttribute(state.element, 'd3pie-labels-percentage-font', "arial"),
+                    fontSize: NETDATA.dataAttribute(state.element, 'd3pie-labels-percentage-fontsize', 10),
+                    fontWeight: NETDATA.dataAttribute(state.element, 'd3pie-labels-percentage-fontweight', "bold"),
+                    decimalPlaces: 0
+                },
+                value: {
+                    color: NETDATA.dataAttribute(state.element, 'd3pie-labels-value-color', NETDATA.themes.current.d3pie.value),
+                    font: NETDATA.dataAttribute(state.element, 'd3pie-labels-value-font', "arial"),
+                    fontSize: NETDATA.dataAttribute(state.element, 'd3pie-labels-value-fontsize', 10),
+                    fontWeight: NETDATA.dataAttribute(state.element, 'd3pie-labels-value-fontweight', "bold")
+                },
+                lines: {
+                    enabled: NETDATA.dataAttributeBoolean(state.element, 'd3pie-labels-lines-enabled', true),
+                    style: NETDATA.dataAttribute(state.element, 'd3pie-labels-lines-style', "curved"),
+                    color: NETDATA.dataAttribute(state.element, 'd3pie-labels-lines-color', "segment") // "segment" or a hex color
+                },
+                truncation: {
+                    enabled: NETDATA.dataAttributeBoolean(state.element, 'd3pie-labels-truncation-enabled', false),
+                    truncateLength: NETDATA.dataAttribute(state.element, 'd3pie-labels-truncation-truncatelength', 30)
+                },
+                formatter: function(context) {
+                    // console.log(context);
+                    if(context.part === 'value')
+                        return state.legendFormatValue(context.value);
+                    if(context.part === 'percentage')
+                        return context.label + '%';
+
+                    return context.label;
+                }
+            },
+            effects: {
+                load: {
+                    effect: "none", // none / default
+                    speed: 0 // commented in the d3pie code to speed it up
+                },
+                pullOutSegmentOnClick: {
+                    effect: "bounce", // none / linear / bounce / elastic / back
+                    speed: 400,
+                    size: 5
+                },
+                highlightSegmentOnMouseover: true,
+                highlightLuminosity: -0.2
+            },
+            tooltips: {
+                enabled: false,
+                type: "placeholder", // caption|placeholder
+                string: "",
+                placeholderParser: null, // function
+                styles: {
+                    fadeInSpeed: 250,
+                    backgroundColor: NETDATA.themes.current.d3pie.tooltip_bg,
+                    backgroundOpacity: 0.5,
+                    color: NETDATA.themes.current.d3pie.tooltip_fg,
+                    borderRadius: 2,
+                    font: "arial",
+                    fontSize: 12,
+                    padding: 4
+                }
+            },
+            misc: {
+                colors: {
+                    background: 'transparent', // transparent or color #
+                    // segments: state.chartColors(),
+                    segmentStroke: NETDATA.dataAttribute(state.element, 'd3pie-misc-colors-segmentstroke', NETDATA.themes.current.d3pie.segment_stroke)
+                },
+                gradient: {
+                    enabled: NETDATA.dataAttributeBoolean(state.element, 'd3pie-misc-gradient-enabled', false),
+                    percentage: NETDATA.dataAttribute(state.element, 'd3pie-misc-colors-percentage', 95),
+                    color: NETDATA.dataAttribute(state.element, 'd3pie-misc-gradient-color', NETDATA.themes.current.d3pie.gradient_color)
+                },
+                canvasPadding: {
+                    top: 5,
+                    right: 5,
+                    bottom: 5,
+                    left: 5
+                },
+                pieCenterOffset: {
+                    x: 0,
+                    y: 0
+                },
+                cssPrefix: NETDATA.dataAttribute(state.element, 'd3pie-cssprefix', null)
+            },
+            callbacks: {
+                onload: null,
+                onMouseoverSegment: null,
+                onMouseoutSegment: null,
+                onClickSegment: null
+            }
+        };
+
+        state.d3pie_instance = new d3pie(state.element_chart, state.d3pie_options);
+        return true;
+    };
+
+    // ----------------------------------------------------------------------------------------------------------------
+    // D3
+
+    NETDATA.d3Initialize = function(callback) {
+        if(typeof netdataStopD3 === 'undefined' || !netdataStopD3) {
+            $.ajax({
+                url: NETDATA.d3_js,
+                cache: true,
+                dataType: "script",
+                xhrFields: { withCredentials: true } // required for the cookie
+            })
+            .done(function() {
+                NETDATA.registerChartLibrary('d3', NETDATA.d3_js);
+            })
+            .fail(function() {
+                NETDATA.chartLibraries.d3.enabled = false;
+                NETDATA.error(100, NETDATA.d3_js);
+            })
+            .always(function() {
+                if(typeof callback === "function")
+                    return callback();
+            });
+        }
+        else {
+            NETDATA.chartLibraries.d3.enabled = false;
+            if(typeof callback === "function")
+                return callback();
+        }
+    };
+
+    NETDATA.d3ChartUpdate = function(state, data) {
+        void(state);
+        void(data);
+
+        return false;
+    };
+
+    NETDATA.d3ChartCreate = function(state, data) {
+        void(state);
+        void(data);
+
+        return false;
+    };
+
+    // ----------------------------------------------------------------------------------------------------------------
+    // google charts
+
+    NETDATA.googleInitialize = function(callback) {
+        if(typeof netdataNoGoogleCharts === 'undefined' || !netdataNoGoogleCharts) {
+            $.ajax({
+                url: NETDATA.google_js,
+                cache: true,
+                dataType: "script",
+                xhrFields: { withCredentials: true } // required for the cookie
+            })
+            .done(function() {
+                NETDATA.registerChartLibrary('google', NETDATA.google_js);
+                google.load('visualization', '1.1', {
+                    'packages': ['corechart', 'controls'],
+                    'callback': callback
+                });
+            })
+            .fail(function() {
+                NETDATA.chartLibraries.google.enabled = false;
+                NETDATA.error(100, NETDATA.google_js);
+                if(typeof callback === "function")
+                    return callback();
+            });
+        }
+        else {
+            NETDATA.chartLibraries.google.enabled = false;
+            if(typeof callback === "function")
+                return callback();
+        }
+    };
+
+    NETDATA.googleChartUpdate = function(state, data) {
+        var datatable = new google.visualization.DataTable(data.result);
+        state.google_instance.draw(datatable, state.google_options);
+        return true;
+    };
+
+    NETDATA.googleChartCreate = function(state, data) {
+        var datatable = new google.visualization.DataTable(data.result);
+
+        state.google_options = {
+            colors: state.chartColors(),
+
+            // do not set width, height - the chart resizes itself
+            //width: state.chartWidth(),
+            //height: state.chartHeight(),
+            lineWidth: 1,
+            title: state.title,
+            fontSize: 11,
+            hAxis: {
+            //  title: "Time of Day",
+            //  format:'HH:mm:ss',
+                viewWindowMode: 'maximized',
+                slantedText: false,
+                format:'HH:mm:ss',
+                textStyle: {
+                    fontSize: 9
+                },
+                gridlines: {
+                    color: '#EEE'
+                }
+            },
+            vAxis: {
+                title: state.units_current,
+                viewWindowMode: 'pretty',
+                minValue: -0.1,
+                maxValue: 0.1,
+                direction: 1,
+                textStyle: {
+                    fontSize: 9
+                },
+                gridlines: {
+                    color: '#EEE'
+                }
+            },
+            chartArea: {
+                width: '65%',
+                height: '80%'
+            },
+            focusTarget: 'category',
+            annotation: {
+                '1': {
+                    style: 'line'
+                }
+            },
+            pointsVisible: 0,
+            titlePosition: 'out',
+            titleTextStyle: {
+                fontSize: 11
+            },
+            tooltip: {
+                isHtml: false,
+                ignoreBounds: true,
+                textStyle: {
+                    fontSize: 9
+                }
+            },
+            curveType: 'function',
+            areaOpacity: 0.3,
+            isStacked: false
+        };
+
+        switch(state.chart.chart_type) {
+            case "area":
+                state.google_options.vAxis.viewWindowMode = 'maximized';
+                state.google_options.areaOpacity = NETDATA.options.current.color_fill_opacity_area;
+                state.google_instance = new google.visualization.AreaChart(state.element_chart);
+                break;
+
+            case "stacked":
+                state.google_options.isStacked = true;
+                state.google_options.areaOpacity = NETDATA.options.current.color_fill_opacity_stacked;
+                state.google_options.vAxis.viewWindowMode = 'maximized';
+                state.google_options.vAxis.minValue = null;
+                state.google_options.vAxis.maxValue = null;
+                state.google_instance = new google.visualization.AreaChart(state.element_chart);
+                break;
+
+            default:
+            case "line":
+                state.google_options.lineWidth = 2;
+                state.google_instance = new google.visualization.LineChart(state.element_chart);
+                break;
+        }
+
+        state.google_instance.draw(datatable, state.google_options);
+        return true;
+    };
+
+    // ----------------------------------------------------------------------------------------------------------------
+
+    NETDATA.easypiechartPercentFromValueMinMax = function(state, value, min, max) {
+        if(typeof value !== 'number') value = 0;
+        if(typeof min !== 'number') min = 0;
+        if(typeof max !== 'number') max = 0;
+
+        if(min > max) {
+            var t = min;
+            min = max;
+            max = t;
+        }
+
+        if(min > value) min = value;
+        if(max < value) max = value;
+
+        state.legendFormatValueDecimalsFromMinMax(min, max);
+
+        if(state.tmp.easyPieChartMin === null && min > 0) min = 0;
+        if(state.tmp.easyPieChartMax === null && max < 0) max = 0;
+
+        var pcent;
+
+        if(min < 0 && max > 0) {
+            // it is both positive and negative
+            // zero at the top center of the chart
+            max = (-min > max)? -min : max;
+            pcent = Math.round(value * 100 / max);
+        }
+        else if(value >= 0 && min >= 0 && max >= 0) {
+            // clockwise
+            pcent = Math.round((value - min) * 100 / (max - min));
+            if(pcent === 0) pcent = 0.1;
+        }
+        else {
+            // counter clockwise
+            pcent = Math.round((value - max) * 100 / (max - min));
+            if(pcent === 0) pcent = -0.1;
+        }
+
+        return pcent;
+    };
+
+    // ----------------------------------------------------------------------------------------------------------------
+    // easy-pie-chart
+
+    NETDATA.easypiechartInitialize = function(callback) {
+        if(typeof netdataNoEasyPieChart === 'undefined' || !netdataNoEasyPieChart) {
+            $.ajax({
+                url: NETDATA.easypiechart_js,
+                cache: true,
+                dataType: "script",
+                xhrFields: { withCredentials: true } // required for the cookie
+            })
+                .done(function() {
+                    NETDATA.registerChartLibrary('easypiechart', NETDATA.easypiechart_js);
+                })
+                .fail(function() {
+                    NETDATA.chartLibraries.easypiechart.enabled = false;
+                    NETDATA.error(100, NETDATA.easypiechart_js);
+                })
+                .always(function() {
+                    if(typeof callback === "function")
+                        return callback();
+                })
+        }
+        else {
+            NETDATA.chartLibraries.easypiechart.enabled = false;
+            if(typeof callback === "function")
+                return callback();
+        }
+    };
+
+    NETDATA.easypiechartClearSelection = function(state, force) {
+        if(typeof state.tmp.easyPieChartEvent !== 'undefined' && typeof state.tmp.easyPieChartEvent.timer !== 'undefined') {
+            NETDATA.timeout.clear(state.tmp.easyPieChartEvent.timer);
+            state.tmp.easyPieChartEvent.timer = undefined;
+        }
+
+        if(state.isAutoRefreshable() === true && state.data !== null && force !== true) {
+            NETDATA.easypiechartChartUpdate(state, state.data);
+        }
+        else {
+            state.tmp.easyPieChartLabel.innerText = state.legendFormatValue(null);
+            state.tmp.easyPieChart_instance.update(0);
+        }
+        state.tmp.easyPieChart_instance.enableAnimation();
+
+        return true;
+    };
+
+    NETDATA.easypiechartSetSelection = function(state, t) {
+        if(state.timeIsVisible(t) !== true)
+            return NETDATA.easypiechartClearSelection(state, true);
+
+        var slot = state.calculateRowForTime(t);
+        if(slot < 0 || slot >= state.data.result.length)
+            return NETDATA.easypiechartClearSelection(state, true);
+
+        if(typeof state.tmp.easyPieChartEvent === 'undefined') {
+            state.tmp.easyPieChartEvent = {
+                timer: undefined,
+                value: 0,
+                pcent: 0
+            };
+        }
+
+        var value = state.data.result[state.data.result.length - 1 - slot];
+        var min = (state.tmp.easyPieChartMin === null)?NETDATA.commonMin.get(state):state.tmp.easyPieChartMin;
+        var max = (state.tmp.easyPieChartMax === null)?NETDATA.commonMax.get(state):state.tmp.easyPieChartMax;
+        var pcent = NETDATA.easypiechartPercentFromValueMinMax(state, value, min, max);
+
+        state.tmp.easyPieChartEvent.value = value;
+        state.tmp.easyPieChartEvent.pcent = pcent;
+        state.tmp.easyPieChartLabel.innerText = state.legendFormatValue(value);
+
+        if(state.tmp.easyPieChartEvent.timer === undefined) {
+            state.tmp.easyPieChart_instance.disableAnimation();
+
+            state.tmp.easyPieChartEvent.timer = NETDATA.timeout.set(function() {
+                state.tmp.easyPieChartEvent.timer = undefined;
+                state.tmp.easyPieChart_instance.update(state.tmp.easyPieChartEvent.pcent);
+            }, 0);
+        }
+
+        return true;
+    };
+
+    NETDATA.easypiechartChartUpdate = function(state, data) {
+        var value, min, max, pcent;
+
+        if(NETDATA.globalPanAndZoom.isActive() === true || state.isAutoRefreshable() === false) {
+            value = null;
+            pcent = 0;
+        }
+        else {
+            value = data.result[0];
+            min = (state.tmp.easyPieChartMin === null)?NETDATA.commonMin.get(state):state.tmp.easyPieChartMin;
+            max = (state.tmp.easyPieChartMax === null)?NETDATA.commonMax.get(state):state.tmp.easyPieChartMax;
+            pcent = NETDATA.easypiechartPercentFromValueMinMax(state, value, min, max);
+        }
+
+        state.tmp.easyPieChartLabel.innerText = state.legendFormatValue(value);
+        state.tmp.easyPieChart_instance.update(pcent);
+        return true;
+    };
+
+    NETDATA.easypiechartChartCreate = function(state, data) {
+        var chart = $(state.element_chart);
+
+        var value = data.result[0];
+        var min = NETDATA.dataAttribute(state.element, 'easypiechart-min-value', null);
+        var max = NETDATA.dataAttribute(state.element, 'easypiechart-max-value', null);
+
+        if(min === null) {
+            min = NETDATA.commonMin.get(state);
+            state.tmp.easyPieChartMin = null;
+        }
+        else
+            state.tmp.easyPieChartMin = min;
+
+        if(max === null) {
+            max = NETDATA.commonMax.get(state);
+            state.tmp.easyPieChartMax = null;
+        }
+        else
+            state.tmp.easyPieChartMax = max;
+
+        var size = state.chartWidth();
+        var stroke = Math.floor(size / 22);
+        if(stroke < 3) stroke = 2;
+
+        var valuefontsize = Math.floor((size * 2 / 3) / 5);
+        var valuetop = Math.round((size - valuefontsize - (size / 40)) / 2);
+        state.tmp.easyPieChartLabel = document.createElement('span');
+        state.tmp.easyPieChartLabel.className = 'easyPieChartLabel';
+        state.tmp.easyPieChartLabel.innerText = state.legendFormatValue(value);
+        state.tmp.easyPieChartLabel.style.fontSize = valuefontsize + 'px';
+        state.tmp.easyPieChartLabel.style.top = valuetop.toString() + 'px';
+        state.element_chart.appendChild(state.tmp.easyPieChartLabel);
+
+        var titlefontsize = Math.round(valuefontsize * 1.6 / 3);
+        var titletop = Math.round(valuetop - (titlefontsize * 2) - (size / 40));
+        state.tmp.easyPieChartTitle = document.createElement('span');
+        state.tmp.easyPieChartTitle.className = 'easyPieChartTitle';
+        state.tmp.easyPieChartTitle.innerText = state.title;
+        state.tmp.easyPieChartTitle.style.fontSize = titlefontsize + 'px';
+        state.tmp.easyPieChartTitle.style.lineHeight = titlefontsize + 'px';
+        state.tmp.easyPieChartTitle.style.top = titletop.toString() + 'px';
+        state.element_chart.appendChild(state.tmp.easyPieChartTitle);
+
+        var unitfontsize = Math.round(titlefontsize * 0.9);
+        var unittop = Math.round(valuetop + (valuefontsize + unitfontsize) + (size / 40));
+        state.tmp.easyPieChartUnits = document.createElement('span');
+        state.tmp.easyPieChartUnits.className = 'easyPieChartUnits';
+        state.tmp.easyPieChartUnits.innerText = state.units_current;
+        state.tmp.easyPieChartUnits.style.fontSize = unitfontsize + 'px';
+        state.tmp.easyPieChartUnits.style.top = unittop.toString() + 'px';
+        state.element_chart.appendChild(state.tmp.easyPieChartUnits);
+
+        var barColor = NETDATA.dataAttribute(state.element, 'easypiechart-barcolor', undefined);
+        if(typeof barColor === 'undefined' || barColor === null)
+            barColor = state.chartCustomColors()[0];
+        else {
+            // <div ... data-easypiechart-barcolor="(function(percent){return(percent < 50 ? '#5cb85c' : percent < 85 ? '#f0ad4e' : '#cb3935');})" ...></div>
+            var tmp = eval(barColor);
+            if(typeof tmp === 'function')
+                barColor = tmp;
+        }
+
+        var pcent = NETDATA.easypiechartPercentFromValueMinMax(state, value, min, max);
+        chart.data('data-percent', pcent);
+
+        chart.easyPieChart({
+            barColor: barColor,
+            trackColor: NETDATA.dataAttribute(state.element, 'easypiechart-trackcolor', NETDATA.themes.current.easypiechart_track),
+            scaleColor: NETDATA.dataAttribute(state.element, 'easypiechart-scalecolor', NETDATA.themes.current.easypiechart_scale),
+            scaleLength: NETDATA.dataAttribute(state.element, 'easypiechart-scalelength', 5),
+            lineCap: NETDATA.dataAttribute(state.element, 'easypiechart-linecap', 'round'),
+            lineWidth: NETDATA.dataAttribute(state.element, 'easypiechart-linewidth', stroke),
+            trackWidth: NETDATA.dataAttribute(state.element, 'easypiechart-trackwidth', undefined),
+            size: NETDATA.dataAttribute(state.element, 'easypiechart-size', size),
+            rotate: NETDATA.dataAttribute(state.element, 'easypiechart-rotate', 0),
+            animate: NETDATA.dataAttribute(state.element, 'easypiechart-animate', {duration: 500, enabled: true}),
+            easing: NETDATA.dataAttribute(state.element, 'easypiechart-easing', undefined)
+        });
+
+        // when we just re-create the chart
+        // do not animate the first update
+        var animate = true;
+        if(typeof state.tmp.easyPieChart_instance !== 'undefined')
+            animate = false;
+
+        state.tmp.easyPieChart_instance = chart.data('easyPieChart');
+        if(animate === false) state.tmp.easyPieChart_instance.disableAnimation();
+        state.tmp.easyPieChart_instance.update(pcent);
+        if(animate === false) state.tmp.easyPieChart_instance.enableAnimation();
+
+        state.legendSetUnitsString = function(units) {
+            if(typeof state.tmp.easyPieChartUnits !== 'undefined' && state.tmp.units !== units) {
+                state.tmp.easyPieChartUnits.innerText = units;
+                state.tmp.units = units;
+            }
+        };
+        state.legendShowUndefined = function() {
+            if(typeof state.tmp.easyPieChart_instance !== 'undefined')
+                NETDATA.easypiechartClearSelection(state);
+        };
+
+        return true;
+    };
+
+    // ----------------------------------------------------------------------------------------------------------------
+    // gauge.js
+
+    NETDATA.gaugeInitialize = function(callback) {
+        if(typeof netdataNoGauge === 'undefined' || !netdataNoGauge) {
+            $.ajax({
+                url: NETDATA.gauge_js,
+                cache: true,
+                dataType: "script",
+                xhrFields: { withCredentials: true } // required for the cookie
+            })
+                .done(function() {
+                    NETDATA.registerChartLibrary('gauge', NETDATA.gauge_js);
+                })
+                .fail(function() {
+                    NETDATA.chartLibraries.gauge.enabled = false;
+                    NETDATA.error(100, NETDATA.gauge_js);
+                })
+                .always(function() {
+                    if(typeof callback === "function")
+                        return callback();
+                })
+        }
+        else {
+            NETDATA.chartLibraries.gauge.enabled = false;
+            if(typeof callback === "function")
+                return callback();
+        }
+    };
+
+    NETDATA.gaugeAnimation = function(state, status) {
+        var speed = 32;
+
+        if(typeof status === 'boolean' && status === false)
+            speed = 1000000000;
+        else if(typeof status === 'number')
+            speed = status;
+
+        // console.log('gauge speed ' + speed);
+        state.tmp.gauge_instance.animationSpeed = speed;
+        state.tmp.___gaugeOld__.speed = speed;
+    };
+
+    NETDATA.gaugeSet = function(state, value, min, max) {
+        if(typeof value !== 'number') value = 0;
+        if(typeof min !== 'number') min = 0;
+        if(typeof max !== 'number') max = 0;
+        if(value > max) max = value;
+        if(value < min) min = value;
+        if(min > max) {
+            var t = min;
+            min = max;
+            max = t;
+        }
+        else if(min === max)
+            max = min + 1;
+
+        state.legendFormatValueDecimalsFromMinMax(min, max);
+
+        // gauge.js has an issue if the needle
+        // is smaller than min or larger than max
+        // when we set the new values
+        // the needle will go crazy
+
+        // to prevent it, we always feed it
+        // with a percentage, so that the needle
+        // is always between min and max
+        var pcent = (value - min) * 100 / (max - min);
+
+        // bug fix for gauge.js 1.3.1
+        // if the value is the absolute min or max, the chart is broken
+        if(pcent < 0.001) pcent = 0.001;
+        if(pcent > 99.999) pcent = 99.999;
+
+        state.tmp.gauge_instance.set(pcent);
+        // console.log('gauge set ' + pcent + ', value ' + value + ', min ' + min + ', max ' + max);
+
+        state.tmp.___gaugeOld__.value = value;
+        state.tmp.___gaugeOld__.min = min;
+        state.tmp.___gaugeOld__.max = max;
+    };
+
+    NETDATA.gaugeSetLabels = function(state, value, min, max) {
+        if(state.tmp.___gaugeOld__.valueLabel !== value) {
+            state.tmp.___gaugeOld__.valueLabel = value;
+            state.tmp.gaugeChartLabel.innerText = state.legendFormatValue(value);
+        }
+        if(state.tmp.___gaugeOld__.minLabel !== min) {
+            state.tmp.___gaugeOld__.minLabel = min;
+            state.tmp.gaugeChartMin.innerText = state.legendFormatValue(min);
+        }
+        if(state.tmp.___gaugeOld__.maxLabel !== max) {
+            state.tmp.___gaugeOld__.maxLabel = max;
+            state.tmp.gaugeChartMax.innerText = state.legendFormatValue(max);
+        }
+    };
+
+    NETDATA.gaugeClearSelection = function(state, force) {
+        if(typeof state.tmp.gaugeEvent !== 'undefined' && typeof state.tmp.gaugeEvent.timer !== 'undefined') {
+            NETDATA.timeout.clear(state.tmp.gaugeEvent.timer);
+            state.tmp.gaugeEvent.timer = undefined;
+        }
+
+        if(state.isAutoRefreshable() === true && state.data !== null && force !== true) {
+            NETDATA.gaugeChartUpdate(state, state.data);
+        }
+        else {
+            NETDATA.gaugeAnimation(state, false);
+            NETDATA.gaugeSetLabels(state, null, null, null);
+            NETDATA.gaugeSet(state, null, null, null);
+        }
+
+        NETDATA.gaugeAnimation(state, true);
+        return true;
+    };
+
+    NETDATA.gaugeSetSelection = function(state, t) {
+        if(state.timeIsVisible(t) !== true)
+            return NETDATA.gaugeClearSelection(state, true);
+
+        var slot = state.calculateRowForTime(t);
+        if(slot < 0 || slot >= state.data.result.length)
+            return NETDATA.gaugeClearSelection(state, true);
+
+        if(typeof state.tmp.gaugeEvent === 'undefined') {
+            state.tmp.gaugeEvent = {
+                timer: undefined,
+                value: 0,
+                min: 0,
+                max: 0
+            };
+        }
+
+        var value = state.data.result[state.data.result.length - 1 - slot];
+        var min = (state.tmp.gaugeMin === null)?NETDATA.commonMin.get(state):state.tmp.gaugeMin;
+        var max = (state.tmp.gaugeMax === null)?NETDATA.commonMax.get(state):state.tmp.gaugeMax;
+
+        // make sure it is zero based
+        // but only if it has not been set by the user
+        if(state.tmp.gaugeMin === null && min > 0) min = 0;
+        if(state.tmp.gaugeMax === null && max < 0) max = 0;
+
+        state.tmp.gaugeEvent.value = value;
+        state.tmp.gaugeEvent.min = min;
+        state.tmp.gaugeEvent.max = max;
+        NETDATA.gaugeSetLabels(state, value, min, max);
+
+        if(state.tmp.gaugeEvent.timer === undefined) {
+            NETDATA.gaugeAnimation(state, false);
+
+            state.tmp.gaugeEvent.timer = NETDATA.timeout.set(function() {
+                state.tmp.gaugeEvent.timer = undefined;
+                NETDATA.gaugeSet(state, state.tmp.gaugeEvent.value, state.tmp.gaugeEvent.min, state.tmp.gaugeEvent.max);
+            }, 0);
+        }
+
+        return true;
+    };
+
+    NETDATA.gaugeChartUpdate = function(state, data) {
+        var value, min, max;
+
+        if(NETDATA.globalPanAndZoom.isActive() === true || state.isAutoRefreshable() === false) {
+            NETDATA.gaugeSetLabels(state, null, null, null);
+            state.tmp.gauge_instance.set(0);
+        }
+        else {
+            value = data.result[0];
+            min = (state.tmp.gaugeMin === null)?NETDATA.commonMin.get(state):state.tmp.gaugeMin;
+            max = (state.tmp.gaugeMax === null)?NETDATA.commonMax.get(state):state.tmp.gaugeMax;
+            if(value < min) min = value;
+            if(value > max) max = value;
+
+            // make sure it is zero based
+            // but only if it has not been set by the user
+            if(state.tmp.gaugeMin === null && min > 0) min = 0;
+            if(state.tmp.gaugeMax === null && max < 0) max = 0;
+
+            NETDATA.gaugeSet(state, value, min, max);
+            NETDATA.gaugeSetLabels(state, value, min, max);
+        }
+
+        return true;
+    };
+
+    NETDATA.gaugeChartCreate = function(state, data) {
+        // var chart = $(state.element_chart);
+
+        var value = data.result[0];
+        var min = NETDATA.dataAttribute(state.element, 'gauge-min-value', null);
+        var max = NETDATA.dataAttribute(state.element, 'gauge-max-value', null);
+        // var adjust = NETDATA.dataAttribute(state.element, 'gauge-adjust', null);
+        var pointerColor = NETDATA.dataAttribute(state.element, 'gauge-pointer-color', NETDATA.themes.current.gauge_pointer);
+        var strokeColor = NETDATA.dataAttribute(state.element, 'gauge-stroke-color', NETDATA.themes.current.gauge_stroke);
+        var startColor = NETDATA.dataAttribute(state.element, 'gauge-start-color', state.chartCustomColors()[0]);
+        var stopColor = NETDATA.dataAttribute(state.element, 'gauge-stop-color', void 0);
+        var generateGradient = NETDATA.dataAttribute(state.element, 'gauge-generate-gradient', false);
+
+        if(min === null) {
+            min = NETDATA.commonMin.get(state);
+            state.tmp.gaugeMin = null;
+        }
+        else
+            state.tmp.gaugeMin = min;
+
+        if(max === null) {
+            max = NETDATA.commonMax.get(state);
+            state.tmp.gaugeMax = null;
+        }
+        else
+            state.tmp.gaugeMax = max;
+
+        // make sure it is zero based
+        // but only if it has not been set by the user
+        if(state.tmp.gaugeMin === null && min > 0) min = 0;
+        if(state.tmp.gaugeMax === null && max < 0) max = 0;
+
+        var width = state.chartWidth(), height = state.chartHeight(); //, ratio = 1.5;
+        // console.log('gauge width: ' + width.toString() + ', height: ' + height.toString());
+        //switch(adjust) {
+        //  case 'width': width = height * ratio; break;
+        //  case 'height':
+        //  default: height = width / ratio; break;
+        //}
+        //state.element.style.width = width.toString() + 'px';
+        //state.element.style.height = height.toString() + 'px';
+
+        var lum_d = 0.05;
+
+        var options = {
+            lines: 12,                  // The number of lines to draw
+            angle: 0.14,                // The span of the gauge arc
+            lineWidth: 0.57,            // The line thickness
+            radiusScale: 1.0,           // Relative radius
+            pointer: {
+                length: 0.85,           // 0.9 The radius of the inner circle
+                strokeWidth: 0.045,     // The rotation offset
+                color: pointerColor     // Fill color
+            },
+            limitMax: true,             // If false, the max value of the gauge will be updated if value surpass max
+            limitMin: true,             // If true, the min value of the gauge will be fixed unless you set it manually
+            colorStart: startColor,     // Colors
+            colorStop: stopColor,       // just experiment with them
+            strokeColor: strokeColor,   // to see which ones work best for you
+            generateGradient: (generateGradient === true),
+            gradientType: 0,
+            highDpiSupport: true        // High resolution support
+        };
+
+        if (generateGradient.constructor === Array) {
+            // example options:
+            // data-gauge-generate-gradient="[0, 50, 100]"
+            // data-gauge-gradient-percent-color-0="#FFFFFF"
+            // data-gauge-gradient-percent-color-50="#999900"
+            // data-gauge-gradient-percent-color-100="#000000"
+
+            options.percentColors = [];
+            var len = generateGradient.length;
+            while(len--) {
+                var pcent = generateGradient[len];
+                var color = NETDATA.dataAttribute(state.element, 'gauge-gradient-percent-color-' + pcent.toString(), false);
+                if(color !== false) {
+                    var a = [];
+                    a[0] = pcent / 100;
+                    a[1] = color;
+                    options.percentColors.unshift(a);
+                }
+            }
+            if(options.percentColors.length === 0)
+                delete options.percentColors;
+        }
+        else if(generateGradient === false && NETDATA.themes.current.gauge_gradient === true) {
+            //noinspection PointlessArithmeticExpressionJS
+            options.percentColors = [
+                [0.0, NETDATA.colorLuminance(startColor, (lum_d * 10) - (lum_d * 0))],
+                [0.1, NETDATA.colorLuminance(startColor, (lum_d * 10) - (lum_d * 1))],
+                [0.2, NETDATA.colorLuminance(startColor, (lum_d * 10) - (lum_d * 2))],
+                [0.3, NETDATA.colorLuminance(startColor, (lum_d * 10) - (lum_d * 3))],
+                [0.4, NETDATA.colorLuminance(startColor, (lum_d * 10) - (lum_d * 4))],
+                [0.5, NETDATA.colorLuminance(startColor, (lum_d * 10) - (lum_d * 5))],
+                [0.6, NETDATA.colorLuminance(startColor, (lum_d * 10) - (lum_d * 6))],
+                [0.7, NETDATA.colorLuminance(startColor, (lum_d * 10) - (lum_d * 7))],
+                [0.8, NETDATA.colorLuminance(startColor, (lum_d * 10) - (lum_d * 8))],
+                [0.9, NETDATA.colorLuminance(startColor, (lum_d * 10) - (lum_d * 9))],
+                [1.0, NETDATA.colorLuminance(startColor, 0.0)]];
+        }
+
+        state.tmp.gauge_canvas = document.createElement('canvas');
+        state.tmp.gauge_canvas.id = 'gauge-' + state.uuid + '-canvas';
+        state.tmp.gauge_canvas.className = 'gaugeChart';
+        state.tmp.gauge_canvas.width  = width;
+        state.tmp.gauge_canvas.height = height;
+        state.element_chart.appendChild(state.tmp.gauge_canvas);
+
+        var valuefontsize = Math.floor(height / 5);
+        var valuetop = Math.round((height - valuefontsize) / 3.2);
+        state.tmp.gaugeChartLabel = document.createElement('span');
+        state.tmp.gaugeChartLabel.className = 'gaugeChartLabel';
+        state.tmp.gaugeChartLabel.style.fontSize = valuefontsize + 'px';
+        state.tmp.gaugeChartLabel.style.top = valuetop.toString() + 'px';
+        state.element_chart.appendChild(state.tmp.gaugeChartLabel);
+
+        var titlefontsize = Math.round(valuefontsize / 2.1);
+        var titletop = 0;
+        state.tmp.gaugeChartTitle = document.createElement('span');
+        state.tmp.gaugeChartTitle.className = 'gaugeChartTitle';
+        state.tmp.gaugeChartTitle.innerText = state.title;
+        state.tmp.gaugeChartTitle.style.fontSize = titlefontsize + 'px';
+        state.tmp.gaugeChartTitle.style.lineHeight = titlefontsize + 'px';
+        state.tmp.gaugeChartTitle.style.top = titletop.toString() + 'px';
+        state.element_chart.appendChild(state.tmp.gaugeChartTitle);
+
+        var unitfontsize = Math.round(titlefontsize * 0.9);
+        state.tmp.gaugeChartUnits = document.createElement('span');
+        state.tmp.gaugeChartUnits.className = 'gaugeChartUnits';
+        state.tmp.gaugeChartUnits.innerText = state.units_current;
+        state.tmp.gaugeChartUnits.style.fontSize = unitfontsize + 'px';
+        state.element_chart.appendChild(state.tmp.gaugeChartUnits);
+
+        state.tmp.gaugeChartMin = document.createElement('span');
+        state.tmp.gaugeChartMin.className = 'gaugeChartMin';
+        state.tmp.gaugeChartMin.style.fontSize = Math.round(valuefontsize * 0.75).toString() + 'px';
+        state.element_chart.appendChild(state.tmp.gaugeChartMin);
+
+        state.tmp.gaugeChartMax = document.createElement('span');
+        state.tmp.gaugeChartMax.className = 'gaugeChartMax';
+        state.tmp.gaugeChartMax.style.fontSize = Math.round(valuefontsize * 0.75).toString() + 'px';
+        state.element_chart.appendChild(state.tmp.gaugeChartMax);
+
+        // when we just re-create the chart
+        // do not animate the first update
+        var animate = true;
+        if(typeof state.tmp.gauge_instance !== 'undefined')
+            animate = false;
+
+        state.tmp.gauge_instance = new Gauge(state.tmp.gauge_canvas).setOptions(options); // create sexy gauge!
+
+        state.tmp.___gaugeOld__ = {
+            value: value,
+            min: min,
+            max: max,
+            valueLabel: null,
+            minLabel: null,
+            maxLabel: null
+        };
+
+        // we will always feed a percentage
+        state.tmp.gauge_instance.minValue = 0;
+        state.tmp.gauge_instance.maxValue = 100;
+
+        NETDATA.gaugeAnimation(state, animate);
+        NETDATA.gaugeSet(state, value, min, max);
+        NETDATA.gaugeSetLabels(state, value, min, max);
+        NETDATA.gaugeAnimation(state, true);
+
+        state.legendSetUnitsString = function(units) {
+            if(typeof state.tmp.gaugeChartUnits !== 'undefined' && state.tmp.units !== units) {
+                state.tmp.gaugeChartUnits.innerText = units;
+                state.tmp.___gaugeOld__.valueLabel = null;
+                state.tmp.___gaugeOld__.minLabel = null;
+                state.tmp.___gaugeOld__.maxLabel = null;
+                state.tmp.units = units;
+            }
+        };
+        state.legendShowUndefined = function() {
+            if(typeof state.tmp.gauge_instance !== 'undefined')
+                NETDATA.gaugeClearSelection(state);
+        };
+
+        return true;
+    };
+
+    // ----------------------------------------------------------------------------------------------------------------
+    // Charts Libraries Registration
+
+    NETDATA.chartLibraries = {
+        "dygraph": {
+            initialize: NETDATA.dygraphInitialize,
+            create: NETDATA.dygraphChartCreate,
+            update: NETDATA.dygraphChartUpdate,
+            resize: function(state) {
+                if(typeof state.tmp.dygraph_instance !== 'undefined' && typeof state.tmp.dygraph_instance.resize === 'function')
+                    state.tmp.dygraph_instance.resize();
+            },
+            setSelection: NETDATA.dygraphSetSelection,
+            clearSelection:  NETDATA.dygraphClearSelection,
+            toolboxPanAndZoom: NETDATA.dygraphToolboxPanAndZoom,
+            initialized: false,
+            enabled: true,
+            xssRegexIgnore: new RegExp('^/api/v1/data\.result.data$'),
+            format: function(state) { void(state); return 'json'; },
+            options: function(state) { return 'ms' + '%7C' + 'flip' + (this.isLogScale(state)?('%7C' + 'abs'):'').toString(); },
+            legend: function(state) {
+                return (this.isSparkline(state) === false && NETDATA.dataAttributeBoolean(state.element, 'legend', true) === true) ? 'right-side' : null;
+            },
+            autoresize: function(state) { void(state); return true; },
+            max_updates_to_recreate: function(state) { void(state); return 5000; },
+            track_colors: function(state) { void(state); return true; },
+            pixels_per_point: function(state) {
+                return (this.isSparkline(state) === false)?3:2;
+            },
+            isSparkline: function(state) {
+                if(typeof state.tmp.dygraph_sparkline === 'undefined') {
+                    state.tmp.dygraph_sparkline = (this.theme(state) === 'sparkline');
+                }
+                return state.tmp.dygraph_sparkline;
+            },
+            isLogScale: function(state) {
+                if(typeof state.tmp.dygraph_logscale === 'undefined') {
+                    state.tmp.dygraph_logscale = (this.theme(state) === 'logscale');
+                }
+                return state.tmp.dygraph_logscale;
+            },
+            theme: function(state) {
+                if(typeof state.tmp.dygraph_theme === 'undefined')
+                    state.tmp.dygraph_theme = NETDATA.dataAttribute(state.element, 'dygraph-theme', 'default');
+                return state.tmp.dygraph_theme;
+            },
+            container_class: function(state) {
+                if(this.legend(state) !== null)
+                    return 'netdata-container-with-legend';
+                return 'netdata-container';
+            }
+        },
+        "sparkline": {
+            initialize: NETDATA.sparklineInitialize,
+            create: NETDATA.sparklineChartCreate,
+            update: NETDATA.sparklineChartUpdate,
+            resize: null,
+            setSelection: undefined, // function(state, t) { void(state); return true; },
+            clearSelection: undefined, // function(state) { void(state); return true; },
+            toolboxPanAndZoom: null,
+            initialized: false,
+            enabled: true,
+            xssRegexIgnore: new RegExp('^/api/v1/data\.result$'),
+            format: function(state) { void(state); return 'array'; },
+            options: function(state) { void(state); return 'flip' + '%7C' + 'abs'; },
+            legend: function(state) { void(state); return null; },
+            autoresize: function(state) { void(state); return false; },
+            max_updates_to_recreate: function(state) { void(state); return 5000; },
+            track_colors: function(state) { void(state); return false; },
+            pixels_per_point: function(state) { void(state); return 3; },
+            container_class: function(state) { void(state); return 'netdata-container'; }
+        },
+        "peity": {
+            initialize: NETDATA.peityInitialize,
+            create: NETDATA.peityChartCreate,
+            update: NETDATA.peityChartUpdate,
+            resize: null,
+            setSelection: undefined, // function(state, t) { void(state); return true; },
+            clearSelection: undefined, // function(state) { void(state); return true; },
+            toolboxPanAndZoom: null,
+            initialized: false,
+            enabled: true,
+            xssRegexIgnore: new RegExp('^/api/v1/data\.result$'),
+            format: function(state) { void(state); return 'ssvcomma'; },
+            options: function(state) { void(state); return 'null2zero' + '%7C' + 'flip' + '%7C' + 'abs'; },
+            legend: function(state) { void(state); return null; },
+            autoresize: function(state) { void(state); return false; },
+            max_updates_to_recreate: function(state) { void(state); return 5000; },
+            track_colors: function(state) { void(state); return false; },
+            pixels_per_point: function(state) { void(state); return 3; },
+            container_class: function(state) { void(state); return 'netdata-container'; }
+        },
+        "morris": {
+            initialize: NETDATA.morrisInitialize,
+            create: NETDATA.morrisChartCreate,
+            update: NETDATA.morrisChartUpdate,
+            resize: null,
+            setSelection: undefined, // function(state, t) { void(state); return true; },
+            clearSelection: undefined, // function(state) { void(state); return true; },
+            toolboxPanAndZoom: null,
+            initialized: false,
+            enabled: true,
+            xssRegexIgnore: new RegExp('^/api/v1/data\.result.data$'),
+            format: function(state) { void(state); return 'json'; },
+            options: function(state) { void(state); return 'objectrows' + '%7C' + 'ms'; },
+            legend: function(state) { void(state); return null; },
+            autoresize: function(state) { void(state); return false; },
+            max_updates_to_recreate: function(state) { void(state); return 50; },
+            track_colors: function(state) { void(state); return false; },
+            pixels_per_point: function(state) { void(state); return 15; },
+            container_class: function(state) { void(state); return 'netdata-container'; }
+        },
+        "google": {
+            initialize: NETDATA.googleInitialize,
+            create: NETDATA.googleChartCreate,
+            update: NETDATA.googleChartUpdate,
+            resize: null,
+            setSelection: undefined, //function(state, t) { void(state); return true; },
+            clearSelection: undefined, //function(state) { void(state); return true; },
+            toolboxPanAndZoom: null,
+            initialized: false,
+            enabled: true,
+            xssRegexIgnore: new RegExp('^/api/v1/data\.result.rows$'),
+            format: function(state) { void(state); return 'datatable'; },
+            options: function(state) { void(state); return ''; },
+            legend: function(state) { void(state); return null; },
+            autoresize: function(state) { void(state); return false; },
+            max_updates_to_recreate: function(state) { void(state); return 300; },
+            track_colors: function(state) { void(state); return false; },
+            pixels_per_point: function(state) { void(state); return 4; },
+            container_class: function(state) { void(state); return 'netdata-container'; }
+        },
+        "raphael": {
+            initialize: NETDATA.raphaelInitialize,
+            create: NETDATA.raphaelChartCreate,
+            update: NETDATA.raphaelChartUpdate,
+            resize: null,
+            setSelection: undefined, // function(state, t) { void(state); return true; },
+            clearSelection: undefined, // function(state) { void(state); return true; },
+            toolboxPanAndZoom: null,
+            initialized: false,
+            enabled: true,
+            xssRegexIgnore: new RegExp('^/api/v1/data\.result.data$'),
+            format: function(state) { void(state); return 'json'; },
+            options: function(state) { void(state); return ''; },
+            legend: function(state) { void(state); return null; },
+            autoresize: function(state) { void(state); return false; },
+            max_updates_to_recreate: function(state) { void(state); return 5000; },
+            track_colors: function(state) { void(state); return false; },
+            pixels_per_point: function(state) { void(state); return 3; },
+            container_class: function(state) { void(state); return 'netdata-container'; }
+        },
+        "c3": {
+            initialize: NETDATA.c3Initialize,
+            create: NETDATA.c3ChartCreate,
+            update: NETDATA.c3ChartUpdate,
+            resize: null,
+            setSelection: undefined, // function(state, t) { void(state); return true; },
+            clearSelection: undefined, // function(state) { void(state); return true; },
+            toolboxPanAndZoom: null,
+            initialized: false,
+            enabled: true,
+            xssRegexIgnore: new RegExp('^/api/v1/data\.result$'),
+            format: function(state) { void(state); return 'csvjsonarray'; },
+            options: function(state) { void(state); return 'milliseconds'; },
+            legend: function(state) { void(state); return null; },
+            autoresize: function(state) { void(state); return false; },
+            max_updates_to_recreate: function(state) { void(state); return 5000; },
+            track_colors: function(state) { void(state); return false; },
+            pixels_per_point: function(state) { void(state); return 15; },
+            container_class: function(state) { void(state); return 'netdata-container'; }
+        },
+        "d3pie": {
+            initialize: NETDATA.d3pieInitialize,
+            create: NETDATA.d3pieChartCreate,
+            update: NETDATA.d3pieChartUpdate,
+            resize: null,
+            setSelection: NETDATA.d3pieSetSelection,
+            clearSelection: NETDATA.d3pieClearSelection,
+            toolboxPanAndZoom: null,
+            initialized: false,
+            enabled: true,
+            xssRegexIgnore: new RegExp('^/api/v1/data\.result.data$'),
+            format: function(state) { void(state); return 'json'; },
+            options: function(state) { void(state); return 'objectrows' + '%7C' + 'ms'; },
+            legend: function(state) { void(state); return null; },
+            autoresize: function(state) { void(state); return false; },
+            max_updates_to_recreate: function(state) { void(state); return 5000; },
+            track_colors: function(state) { void(state); return false; },
+            pixels_per_point: function(state) { void(state); return 15; },
+            container_class: function(state) { void(state); return 'netdata-container'; }
+        },
+        "d3": {
+            initialize: NETDATA.d3Initialize,
+            create: NETDATA.d3ChartCreate,
+            update: NETDATA.d3ChartUpdate,
+            resize: null,
+            setSelection: undefined, // function(state, t) { void(state); return true; },
+            clearSelection: undefined, // function(state) { void(state); return true; },
+            toolboxPanAndZoom: null,
+            initialized: false,
+            enabled: true,
+            xssRegexIgnore: new RegExp('^/api/v1/data\.result.data$'),
+            format: function(state) { void(state); return 'json'; },
+            options: function(state) { void(state); return ''; },
+            legend: function(state) { void(state); return null; },
+            autoresize: function(state) { void(state); return false; },
+            max_updates_to_recreate: function(state) { void(state); return 5000; },
+            track_colors: function(state) { void(state); return false; },
+            pixels_per_point: function(state) { void(state); return 3; },
+            container_class: function(state) { void(state); return 'netdata-container'; }
+        },
+        "easypiechart": {
+            initialize: NETDATA.easypiechartInitialize,
+            create: NETDATA.easypiechartChartCreate,
+            update: NETDATA.easypiechartChartUpdate,
+            resize: null,
+            setSelection: NETDATA.easypiechartSetSelection,
+            clearSelection: NETDATA.easypiechartClearSelection,
+            toolboxPanAndZoom: null,
+            initialized: false,
+            enabled: true,
+            xssRegexIgnore: new RegExp('^/api/v1/data\.result$'),
+            format: function(state) { void(state); return 'array'; },
+            options: function(state) { void(state); return 'absolute'; },
+            legend: function(state) { void(state); return null; },
+            autoresize: function(state) { void(state); return false; },
+            max_updates_to_recreate: function(state) { void(state); return 5000; },
+            track_colors: function(state) { void(state); return true; },
+            pixels_per_point: function(state) { void(state); return 3; },
+            aspect_ratio: 100,
+            container_class: function(state) { void(state); return 'netdata-container-easypiechart'; }
+        },
+        "gauge": {
+            initialize: NETDATA.gaugeInitialize,
+            create: NETDATA.gaugeChartCreate,
+            update: NETDATA.gaugeChartUpdate,
+            resize: null,
+            setSelection: NETDATA.gaugeSetSelection,
+            clearSelection: NETDATA.gaugeClearSelection,
+            toolboxPanAndZoom: null,
+            initialized: false,
+            enabled: true,
+            xssRegexIgnore: new RegExp('^/api/v1/data\.result$'),
+            format: function(state) { void(state); return 'array'; },
+            options: function(state) { void(state); return 'absolute'; },
+            legend: function(state) { void(state); return null; },
+            autoresize: function(state) { void(state); return false; },
+            max_updates_to_recreate: function(state) { void(state); return 5000; },
+            track_colors: function(state) { void(state); return true; },
+            pixels_per_point: function(state) { void(state); return 3; },
+            aspect_ratio: 60,
+            container_class: function(state) { void(state); return 'netdata-container-gauge'; }
+        }
+    };
+
+    NETDATA.registerChartLibrary = function(library, url) {
+        if(NETDATA.options.debug.libraries === true)
+            console.log("registering chart library: " + library);
+
+        NETDATA.chartLibraries[library].url = url;
+        NETDATA.chartLibraries[library].initialized = true;
+        NETDATA.chartLibraries[library].enabled = true;
+    };
+
+    // ----------------------------------------------------------------------------------------------------------------
+    // Load required JS libraries and CSS
+
+    NETDATA.requiredJs = [
+        {
+            url: NETDATA.serverStatic + 'lib/bootstrap-3.3.7.min.js',
+            async: false,
+            isAlreadyLoaded: function() {
+                // check if bootstrap is loaded
+                if(typeof $().emulateTransitionEnd === 'function')
+                    return true;
+                else {
+                    return (typeof netdataNoBootstrap !== 'undefined' && netdataNoBootstrap === true);
+                }
+            }
+        },
+        {
+            url: NETDATA.serverStatic + 'lib/fontawesome-all-5.0.1.min.js',
+            async: true,
+            isAlreadyLoaded: function() {
+                return (typeof netdataNoFontAwesome !== 'undefined' && netdataNoFontAwesome === true);
+            }
+        },
+        {
+            url: NETDATA.serverStatic + 'lib/perfect-scrollbar-0.6.15.min.js',
+            isAlreadyLoaded: function() { return false; }
+        }
+    ];
+
+    NETDATA.requiredCSS = [
+        {
+            url: NETDATA.themes.current.bootstrap_css,
+            isAlreadyLoaded: function() {
+                return (typeof netdataNoBootstrap !== 'undefined' && netdataNoBootstrap === true);
+            }
+        },
+        {
+            url: NETDATA.themes.current.dashboard_css,
+            isAlreadyLoaded: function() { return false; }
+        }
+    ];
+
+    NETDATA.loadedRequiredJs = 0;
+    NETDATA.loadRequiredJs = function(index, callback) {
+        if(index >= NETDATA.requiredJs.length) {
+            if(typeof callback === 'function')
+                return callback();
+            return;
+        }
+
+        if(NETDATA.requiredJs[index].isAlreadyLoaded()) {
+            NETDATA.loadedRequiredJs++;
+            NETDATA.loadRequiredJs(++index, callback);
+            return;
+        }
+
+        if(NETDATA.options.debug.main_loop === true)
+            console.log('loading ' + NETDATA.requiredJs[index].url);
+
+        var async = true;
+        if(typeof NETDATA.requiredJs[index].async !== 'undefined' && NETDATA.requiredJs[index].async === false)
+            async = false;
+
+        $.ajax({
+            url: NETDATA.requiredJs[index].url,
+            cache: true,
+            dataType: "script",
+            xhrFields: { withCredentials: true } // required for the cookie
+        })
+        .done(function() {
+            if(NETDATA.options.debug.main_loop === true)
+                console.log('loaded ' + NETDATA.requiredJs[index].url);
+        })
+        .fail(function() {
+            alert('Cannot load required JS library: ' + NETDATA.requiredJs[index].url);
+        })
+        .always(function() {
+            NETDATA.loadedRequiredJs++;
+
+            if(async === false)
+                NETDATA.loadRequiredJs(++index, callback);
+        });
+
+        if(async === true)
+            NETDATA.loadRequiredJs(++index, callback);
+    };
+
+    NETDATA.loadRequiredCSS = function(index) {
+        if(index >= NETDATA.requiredCSS.length)
+            return;
+
+        if(NETDATA.requiredCSS[index].isAlreadyLoaded()) {
+            NETDATA.loadRequiredCSS(++index);
+            return;
+        }
+
+        if(NETDATA.options.debug.main_loop === true)
+            console.log('loading ' + NETDATA.requiredCSS[index].url);
+
+        NETDATA._loadCSS(NETDATA.requiredCSS[index].url);
+        NETDATA.loadRequiredCSS(++index);
+    };
+
+
+    // ----------------------------------------------------------------------------------------------------------------
+    // Registry of netdata hosts
+
+    NETDATA.alarms = {
+        onclick: null,                  // the callback to handle the click - it will be called with the alarm log entry
+        chart_div_offset: -50,          // give that space above the chart when scrolling to it
+        chart_div_id_prefix: 'chart_',  // the chart DIV IDs have this prefix (they should be NETDATA.name2id(chart.id))
+        chart_div_animation_duration: 0,// the duration of the animation while scrolling to a chart
+
+        ms_penalty: 0,                  // the time penalty of the next alarm
+        ms_between_notifications: 500,  // firefox moves the alarms off-screen (above, outside the top of the screen)
+                                        // if alarms are shown faster than: one per 500ms
+
+        update_every: 10000,            // the time in ms between alarm checks
+
+        notifications: false,           // when true, the browser supports notifications (may not be granted though)
+        last_notification_id: 0,        // the id of the last alarm_log we have raised an alarm for
+        first_notification_id: 0,       // the id of the first alarm_log entry for this session
+                                        // this is used to prevent CLEAR notifications for past events
+        // notifications_shown: [],
+
+        server: null,                   // the server to connect to for fetching alarms
+        current: null,                  // the list of raised alarms - updated in the background
+
+        // a callback function to call every time the list of raised alarms is refreshed
+        callback: (typeof netdataAlarmsActiveCallback === 'function')?netdataAlarmsActiveCallback:null,
+
+        // a callback function to call every time a notification is shown
+        // the return value is used to decide if the notification will be shown
+        notificationCallback: (typeof netdataAlarmsNotifCallback === 'function')?netdataAlarmsNotifCallback:null,
+
+        recipients: null,               // the list (array) of recipients to show alarms for, or null
+
+        recipientMatches: function(to_string, wanted_array) {
+            if(typeof wanted_array === 'undefined' || wanted_array === null || Array.isArray(wanted_array) === false)
+                return true;
+
+            var r = ' ' + to_string.toString() + ' ';
+            var len = wanted_array.length;
+            while(len--) {
+                if(r.indexOf(' ' + wanted_array[len] + ' ') >= 0)
+                    return true;
+            }
+
+            return false;
+        },
+
+        activeForRecipients: function() {
+            var active = {};
+            var data = NETDATA.alarms.current;
+
+            if(typeof data === 'undefined' || data === null)
+                return active;
+
+            for(var x in data.alarms) {
+                if(!data.alarms.hasOwnProperty(x)) continue;
+
+                var alarm = data.alarms[x];
+                if((alarm.status === 'WARNING' || alarm.status === 'CRITICAL') && NETDATA.alarms.recipientMatches(alarm.recipient, NETDATA.alarms.recipients))
+                    active[x] = alarm;
+            }
+
+            return active;
+        },
+
+        notify: function(entry) {
+            // console.log('alarm ' + entry.unique_id);
+
+            if(entry.updated === true) {
+                // console.log('alarm ' + entry.unique_id + ' has been updated by another alarm');
+                return;
+            }
+
+            var value_string = entry.value_string;
+
+            if(NETDATA.alarms.current !== null) {
+                // get the current value_string
+                var t = NETDATA.alarms.current.alarms[entry.chart + '.' + entry.name];
+                if(typeof t !== 'undefined' && entry.status === t.status && typeof t.value_string !== 'undefined')
+                    value_string = t.value_string;
+            }
+
+            var name = entry.name.replace(/_/g, ' ');
+            var status = entry.status.toLowerCase();
+            var title = name + ' = ' + value_string.toString();
+            var tag = entry.alarm_id;
+            var icon = 'images/seo-performance-128.png';
+            var interaction = false;
+            var data = entry;
+            var show = true;
+
+            // console.log('alarm ' + entry.unique_id + ' ' + entry.chart + '.' + entry.name + ' is ' +  entry.status);
+
+            switch(entry.status) {
+                case 'REMOVED':
+                    show = false;
+                    break;
+
+                case 'UNDEFINED':
+                    return;
+
+                case 'UNINITIALIZED':
+                    return;
+
+                case 'CLEAR':
+                    if(entry.unique_id < NETDATA.alarms.first_notification_id) {
+                        // console.log('alarm ' + entry.unique_id + ' is not current');
+                        return;
+                    }
+                    if(entry.old_status === 'UNINITIALIZED' || entry.old_status === 'UNDEFINED') {
+                        // console.log('alarm' + entry.unique_id + ' switch to CLEAR from ' + entry.old_status);
+                        return;
+                    }
+                    if(entry.no_clear_notification === true) {
+                        // console.log('alarm' + entry.unique_id + ' is CLEAR but has no_clear_notification flag');
+                        return;
+                    }
+                    title = name + ' back to normal (' + value_string.toString() + ')';
+                    icon = 'images/check-mark-2-128-green.png';
+                    interaction = false;
+                    break;
+
+                case 'WARNING':
+                    if(entry.old_status === 'CRITICAL')
+                        status = 'demoted to ' + entry.status.toLowerCase();
+
+                    icon = 'images/alert-128-orange.png';
+                    interaction = false;
+                    break;
+
+                case 'CRITICAL':
+                    if(entry.old_status === 'WARNING')
+                        status = 'escalated to ' + entry.status.toLowerCase();
+                    
+                    icon = 'images/alert-128-red.png';
+                    interaction = true;
+                    break;
+
+                default:
+                    console.log('invalid alarm status ' + entry.status);
+                    return;
+            }
+
+            // filter recipients
+            if(show === true)
+                show = NETDATA.alarms.recipientMatches(entry.recipient, NETDATA.alarms.recipients);
+
+            /*
+            // cleanup old notifications with the same alarm_id as this one
+            // it does not seem to work on any web browser - so notifications cannot be removed
+
+            var len = NETDATA.alarms.notifications_shown.length;
+            while(len--) {
+                var n = NETDATA.alarms.notifications_shown[len];
+                if(n.data.alarm_id === entry.alarm_id) {
+                    console.log('removing old alarm ' + n.data.unique_id);
+
+                    // close the notification
+                    n.close.bind(n);
+
+                    // remove it from the array
+                    NETDATA.alarms.notifications_shown.splice(len, 1);
+                    len = NETDATA.alarms.notifications_shown.length;
+                }
+            }
+            */
+
+            if(show === true) {
+                if(typeof NETDATA.alarms.notificationCallback === 'function')
+                    show = NETDATA.alarms.notificationCallback(entry);
+
+                if(show === true) {
+                    setTimeout(function() {
+                        // show this notification
+                        // console.log('new notification: ' + title);
+                        var n = new Notification(title, {
+                            body: entry.hostname + ' - ' + entry.chart + ' (' + entry.family + ') - ' + status + ': ' + entry.info,
+                            tag: tag,
+                            requireInteraction: interaction,
+                            icon: NETDATA.serverStatic + icon,
+                            data: data
+                        });
+
+                        n.onclick = function(event) {
+                            event.preventDefault();
+                            NETDATA.alarms.onclick(event.target.data);
+                        };
+
+                        // console.log(n);
+                        // NETDATA.alarms.notifications_shown.push(n);
+                        // console.log(entry);
+                    }, NETDATA.alarms.ms_penalty);
+
+                    NETDATA.alarms.ms_penalty += NETDATA.alarms.ms_between_notifications;
+                }
+            }
+        },
+
+        scrollToChart: function(chart_id) {
+            if(typeof chart_id === 'string') {
+                var offset = $('#' + NETDATA.alarms.chart_div_id_prefix + NETDATA.name2id(chart_id)).offset();
+                if(typeof offset !== 'undefined') {
+                    $('html, body').animate({ scrollTop: offset.top + NETDATA.alarms.chart_div_offset }, NETDATA.alarms.chart_div_animation_duration);
+                    return true;
+                }
+            }
+            return false;
+        },
+
+        scrollToAlarm: function(alarm) {
+            if(typeof alarm === 'object') {
+                var ret = NETDATA.alarms.scrollToChart(alarm.chart);
+
+                if(ret === true && NETDATA.options.page_is_visible === false)
+                    window.focus();
+                //    alert('netdata dashboard will now scroll to chart: ' + alarm.chart + '\n\nThis alarm opened to bring the browser window in front of the screen. Click on the dashboard to prevent it from appearing again.');
+            }
+
+        },
+
+        notifyAll: function() {
+            // console.log('FETCHING ALARM LOG');
+            NETDATA.alarms.get_log(NETDATA.alarms.last_notification_id, function(data) {
+                // console.log('ALARM LOG FETCHED');
+
+                if(data === null || typeof data !== 'object') {
+                    console.log('invalid alarms log response');
+                    return;
+                }
+
+                if(data.length === 0) {
+                    console.log('received empty alarm log');
+                    return;
+                }
+
+                // console.log('received alarm log of ' + data.length + ' entries, from ' + data[data.length - 1].unique_id.toString() + ' to ' + data[0].unique_id.toString());
+
+                data.sort(function(a, b) {
+                    if(a.unique_id > b.unique_id) return -1;
+                    if(a.unique_id < b.unique_id) return 1;
+                    return 0;
+                });
+
+                NETDATA.alarms.ms_penalty = 0;
+
+                var len = data.length;
+                while(len--) {
+                    if(data[len].unique_id > NETDATA.alarms.last_notification_id) {
+                        NETDATA.alarms.notify(data[len]);
+                    }
+                    //else
+                    //    console.log('ignoring alarm (older) with id ' + data[len].unique_id.toString());
+                }
+
+                NETDATA.alarms.last_notification_id = data[0].unique_id;
+
+                if(typeof netdataAlarmsRemember === 'undefined' || netdataAlarmsRemember === true)
+                    NETDATA.localStorageSet('last_notification_id', NETDATA.alarms.last_notification_id, null);
+                // console.log('last notification id = ' + NETDATA.alarms.last_notification_id);
+            })
+        },
+
+        check_notifications: function() {
+            // returns true if we should fire 1+ notifications
+
+            if(NETDATA.alarms.notifications !== true) {
+                // console.log('web notifications are not available');
+                return false;
+            }
+
+            if(Notification.permission !== 'granted') {
+                // console.log('web notifications are not granted');
+                return false;
+            }
+
+            if(typeof NETDATA.alarms.current !== 'undefined' && typeof NETDATA.alarms.current.alarms === 'object') {
+                // console.log('can do alarms: old id = ' + NETDATA.alarms.last_notification_id + ' new id = ' + NETDATA.alarms.current.latest_alarm_log_unique_id);
+
+                if(NETDATA.alarms.current.latest_alarm_log_unique_id > NETDATA.alarms.last_notification_id) {
+                    // console.log('new alarms detected');
+                    return true;
+                }
+                //else console.log('no new alarms');
+            }
+            // else console.log('cannot process alarms');
+
+            return false;
+        },
+
+        get: function(what, callback) {
+            $.ajax({
+                url: NETDATA.alarms.server + '/api/v1/alarms?' + what.toString(),
+                async: true,
+                cache: false,
+                headers: {
+                    'Cache-Control': 'no-cache, no-store',
+                    'Pragma': 'no-cache'
+                },
+                xhrFields: { withCredentials: true } // required for the cookie
+            })
+                .done(function(data) {
+                    data = NETDATA.xss.checkOptional('/api/v1/alarms', data /*, '.*\.(calc|calc_parsed|warn|warn_parsed|crit|crit_parsed)$' */);
+
+                    if(NETDATA.alarms.first_notification_id === 0 && typeof data.latest_alarm_log_unique_id === 'number')
+                        NETDATA.alarms.first_notification_id = data.latest_alarm_log_unique_id;
+
+                    if(typeof callback === 'function')
+                        return callback(data);
+                })
+                .fail(function() {
+                    NETDATA.error(415, NETDATA.alarms.server);
+
+                    if(typeof callback === 'function')
+                        return callback(null);
+                });
+        },
+
+        update_forever: function() {
+            if(netdataShowAlarms !== true || netdataSnapshotData !== null)
+                return;
+
+            NETDATA.alarms.get('active', function(data) {
+                if(data !== null) {
+                    NETDATA.alarms.current = data;
+
+                    if(NETDATA.alarms.check_notifications() === true) {
+                        NETDATA.alarms.notifyAll();
+                    }
+
+                    if (typeof NETDATA.alarms.callback === 'function') {
+                        NETDATA.alarms.callback(data);
+                    }
+
+                    // Health monitoring is disabled on this netdata
+                    if(data.status === false) return;
+                }
+
+                setTimeout(NETDATA.alarms.update_forever, NETDATA.alarms.update_every);
+            });
+        },
+
+        get_log: function(last_id, callback) {
+            // console.log('fetching all log after ' + last_id.toString());
+            $.ajax({
+                url: NETDATA.alarms.server + '/api/v1/alarm_log?after=' + last_id.toString(),
+                async: true,
+                cache: false,
+                headers: {
+                    'Cache-Control': 'no-cache, no-store',
+                    'Pragma': 'no-cache'
+                },
+                xhrFields: { withCredentials: true } // required for the cookie
+            })
+                .done(function(data) {
+                    data = NETDATA.xss.checkOptional('/api/v1/alarm_log', data);
+
+                    if(typeof callback === 'function')
+                        return callback(data);
+                })
+                .fail(function() {
+                    NETDATA.error(416, NETDATA.alarms.server);
+
+                    if(typeof callback === 'function')
+                        return callback(null);
+                });
+        },
+
+        init: function() {
+            NETDATA.alarms.server = NETDATA.fixHost(NETDATA.serverDefault);
+
+            if(typeof netdataAlarmsRemember === 'undefined' || netdataAlarmsRemember === true) {
+                NETDATA.alarms.last_notification_id =
+                    NETDATA.localStorageGet('last_notification_id', NETDATA.alarms.last_notification_id, null);
+            }
+
+            if(NETDATA.alarms.onclick === null)
+                NETDATA.alarms.onclick = NETDATA.alarms.scrollToAlarm;
+
+            if(typeof netdataAlarmsRecipients !== 'undefined' && Array.isArray(netdataAlarmsRecipients))
+                NETDATA.alarms.recipients = netdataAlarmsRecipients;
+
+            if(netdataShowAlarms === true) {
+                NETDATA.alarms.update_forever();
+            
+                if('Notification' in window) {
+                    // console.log('notifications available');
+                    NETDATA.alarms.notifications = true;
+
+                    if(Notification.permission === 'default')
+                        Notification.requestPermission();
+                }
+            }
+        }
+    };
+
+    // ----------------------------------------------------------------------------------------------------------------
+    // Registry of netdata hosts
+
+    NETDATA.registry = {
+        server: null,         // the netdata registry server
+        person_guid: null,    // the unique ID of this browser / user
+        machine_guid: null,   // the unique ID the netdata server that served dashboard.js
+        hostname: 'unknown',  // the hostname of the netdata server that served dashboard.js
+        machines: null,       // the user's other URLs
+        machines_array: null, // the user's other URLs in an array
+        person_urls: null,
+
+        parsePersonUrls: function(person_urls) {
+            // console.log(person_urls);
+            NETDATA.registry.person_urls = person_urls;
+
+            if(person_urls) {
+                NETDATA.registry.machines = {};
+                NETDATA.registry.machines_array = [];
+
+                var apu = person_urls;
+                var i = apu.length;
+                while(i--) {
+                    if(typeof NETDATA.registry.machines[apu[i][0]] === 'undefined') {
+                        // console.log('adding: ' + apu[i][4] + ', ' + ((now - apu[i][2]) / 1000).toString());
+
+                        var obj = {
+                            guid: apu[i][0],
+                            url: apu[i][1],
+                            last_t: apu[i][2],
+                            accesses: apu[i][3],
+                            name: apu[i][4],
+                            alternate_urls: []
+                        };
+                        obj.alternate_urls.push(apu[i][1]);
+
+                        NETDATA.registry.machines[apu[i][0]] = obj;
+                        NETDATA.registry.machines_array.push(obj);
+                    }
+                    else {
+                        // console.log('appending: ' + apu[i][4] + ', ' + ((now - apu[i][2]) / 1000).toString());
+
+                        var pu = NETDATA.registry.machines[apu[i][0]];
+                        if(pu.last_t < apu[i][2]) {
+                            pu.url = apu[i][1];
+                            pu.last_t = apu[i][2];
+                            pu.name = apu[i][4];
+                        }
+                        pu.accesses += apu[i][3];
+                        pu.alternate_urls.push(apu[i][1]);
+                    }
+                }
+            }
+
+            if(typeof netdataRegistryCallback === 'function')
+                netdataRegistryCallback(NETDATA.registry.machines_array);
+        },
+
+        init: function() {
+            if(netdataRegistry !== true) return;
+
+            NETDATA.registry.hello(NETDATA.serverDefault, function(data) {
+                if(data) {
+                    NETDATA.registry.server = data.registry;
+                    NETDATA.registry.machine_guid = data.machine_guid;
+                    NETDATA.registry.hostname = data.hostname;
+
+                    NETDATA.registry.access(2, function (person_urls) {
+                        NETDATA.registry.parsePersonUrls(person_urls);
+
+                    });
+                }
+            });
+        },
+
+        hello: function(host, callback) {
+            host = NETDATA.fixHost(host);
+
+            // send HELLO to a netdata server:
+            // 1. verifies the server is reachable
+            // 2. responds with the registry URL, the machine GUID of this netdata server and its hostname
+            $.ajax({
+                    url: host + '/api/v1/registry?action=hello',
+                    async: true,
+                    cache: false,
+                    headers: {
+                        'Cache-Control': 'no-cache, no-store',
+                        'Pragma': 'no-cache'
+                    },
+                    xhrFields: { withCredentials: true } // required for the cookie
+                })
+                .done(function(data) {
+                    data = NETDATA.xss.checkOptional('/api/v1/registry?action=hello', data);
+
+                    if(typeof data.status !== 'string' || data.status !== 'ok') {
+                        NETDATA.error(408, host + ' response: ' + JSON.stringify(data));
+                        data = null;
+                    }
+
+                    if(typeof callback === 'function')
+                        return callback(data);
+                })
+                .fail(function() {
+                    NETDATA.error(407, host);
+
+                    if(typeof callback === 'function')
+                        return callback(null);
+                });
+        },
+
+        access: function(max_redirects, callback) {
+            // send ACCESS to a netdata registry:
+            // 1. it lets it know we are accessing a netdata server (its machine GUID and its URL)
+            // 2. it responds with a list of netdata servers we know
+            // the registry identifies us using a cookie it sets the first time we access it
+            // the registry may respond with a redirect URL to send us to another registry
+            $.ajax({
+                    url: NETDATA.registry.server + '/api/v1/registry?action=access&machine=' + NETDATA.registry.machine_guid + '&name=' + encodeURIComponent(NETDATA.registry.hostname) + '&url=' + encodeURIComponent(NETDATA.serverDefault), // + '&visible_url=' + encodeURIComponent(document.location),
+                    async: true,
+                    cache: false,
+                    headers: {
+                        'Cache-Control': 'no-cache, no-store',
+                        'Pragma': 'no-cache'
+                    },
+                    xhrFields: { withCredentials: true } // required for the cookie
+                })
+                .done(function(data) {
+                    data = NETDATA.xss.checkAlways('/api/v1/registry?action=access', data);
+
+                    var redirect = null;
+                    if(typeof data.registry === 'string')
+                        redirect = data.registry;
+
+                    if(typeof data.status !== 'string' || data.status !== 'ok') {
+                        NETDATA.error(409, NETDATA.registry.server + ' responded with: ' + JSON.stringify(data));
+                        data = null;
+                    }
+
+                    if(data === null) {
+                        if(redirect !== null && max_redirects > 0) {
+                            NETDATA.registry.server = redirect;
+                            NETDATA.registry.access(max_redirects - 1, callback);
+                        }
+                        else {
+                            if(typeof callback === 'function')
+                                return callback(null);
+                        }
+                    }
+                    else {
+                        if(typeof data.person_guid === 'string')
+                            NETDATA.registry.person_guid = data.person_guid;
+
+                        if(typeof callback === 'function')
+                            return callback(data.urls);
+                    }
+                })
+                .fail(function() {
+                    NETDATA.error(410, NETDATA.registry.server);
+
+                    if(typeof callback === 'function')
+                        return callback(null);
+                });
+        },
+
+        delete: function(delete_url, callback) {
+            // send DELETE to a netdata registry:
+            $.ajax({
+                url: NETDATA.registry.server + '/api/v1/registry?action=delete&machine=' + NETDATA.registry.machine_guid + '&name=' + encodeURIComponent(NETDATA.registry.hostname) + '&url=' + encodeURIComponent(NETDATA.serverDefault) + '&delete_url=' + encodeURIComponent(delete_url),
+                async: true,
+                cache: false,
+                headers: {
+                    'Cache-Control': 'no-cache, no-store',
+                    'Pragma': 'no-cache'
+                },
+                xhrFields: { withCredentials: true } // required for the cookie
+            })
+                .done(function(data) {
+                    data = NETDATA.xss.checkAlways('/api/v1/registry?action=delete', data);
+
+                    if(typeof data.status !== 'string' || data.status !== 'ok') {
+                        NETDATA.error(411, NETDATA.registry.server + ' responded with: ' + JSON.stringify(data));
+                        data = null;
+                    }
+
+                    if(typeof callback === 'function')
+                        return callback(data);
+                })
+                .fail(function() {
+                    NETDATA.error(412, NETDATA.registry.server);
+
+                    if(typeof callback === 'function')
+                        return callback(null);
+                });
+        },
+
+        search: function(machine_guid, callback) {
+            // SEARCH for the URLs of a machine:
+            $.ajax({
+                url: NETDATA.registry.server + '/api/v1/registry?action=search&machine=' + NETDATA.registry.machine_guid + '&name=' + encodeURIComponent(NETDATA.registry.hostname) + '&url=' + encodeURIComponent(NETDATA.serverDefault) + '&for=' + machine_guid,
+                async: true,
+                cache: false,
+                headers: {
+                    'Cache-Control': 'no-cache, no-store',
+                    'Pragma': 'no-cache'
+                },
+                xhrFields: { withCredentials: true } // required for the cookie
+            })
+                .done(function(data) {
+                    data = NETDATA.xss.checkAlways('/api/v1/registry?action=search', data);
+
+                    if(typeof data.status !== 'string' || data.status !== 'ok') {
+                        NETDATA.error(417, NETDATA.registry.server + ' responded with: ' + JSON.stringify(data));
+                        data = null;
+                    }
+
+                    if(typeof callback === 'function')
+                        return callback(data);
+                })
+                .fail(function() {
+                    NETDATA.error(418, NETDATA.registry.server);
+
+                    if(typeof callback === 'function')
+                        return callback(null);
+                });
+        },
+
+        switch: function(new_person_guid, callback) {
+            // impersonate
+            $.ajax({
+                url: NETDATA.registry.server + '/api/v1/registry?action=switch&machine=' + NETDATA.registry.machine_guid + '&name=' + encodeURIComponent(NETDATA.registry.hostname) + '&url=' + encodeURIComponent(NETDATA.serverDefault) + '&to=' + new_person_guid,
+                async: true,
+                cache: false,
+                headers: {
+                    'Cache-Control': 'no-cache, no-store',
+                    'Pragma': 'no-cache'
+                },
+                xhrFields: { withCredentials: true } // required for the cookie
+            })
+                .done(function(data) {
+                    data = NETDATA.xss.checkAlways('/api/v1/registry?action=switch', data);
+
+                    if(typeof data.status !== 'string' || data.status !== 'ok') {
+                        NETDATA.error(413, NETDATA.registry.server + ' responded with: ' + JSON.stringify(data));
+                        data = null;
+                    }
+
+                    if(typeof callback === 'function')
+                        return callback(data);
+                })
+                .fail(function() {
+                    NETDATA.error(414, NETDATA.registry.server);
+
+                    if(typeof callback === 'function')
+                        return callback(null);
+                });
+        }
+    };
+
+    // ----------------------------------------------------------------------------------------------------------------
+    // Boot it!
+
+    if(typeof netdataPrepCallback === 'function')
+        netdataPrepCallback();
+
+    NETDATA.errorReset();
+    NETDATA.loadRequiredCSS(0);
+
+    NETDATA._loadjQuery(function() {
+        NETDATA.loadRequiredJs(0, function() {
+            if(typeof $().emulateTransitionEnd !== 'function') {
+                // bootstrap is not available
+                NETDATA.options.current.show_help = false;
+            }
+
+            if(typeof netdataDontStart === 'undefined' || !netdataDontStart) {
+                if(NETDATA.options.debug.main_loop === true)
+                    console.log('starting chart refresh thread');
+
+                NETDATA.start();
+            }
+        });
+    });
+})(window, document, (typeof jQuery === 'function')?jQuery:undefined);