Merging upstream version 1.11.0+dfsg.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
author: Daniel Baumann <daniel.baumann@progress-linux.org> 2018-11-07 12:22:44 +0000
committer: Daniel Baumann <daniel.baumann@progress-linux.org> 2018-11-07 12:22:44 +0000
commit: 1e6c93250172946eeb38e94a92a1fd12c9d3011e (patch)
tree: 8ca5e16dfc7ad6b3bf2738ca0a48408a950f8f7e /web/api
parent: Update watch file (diff)
download: netdata-1e6c93250172946eeb38e94a92a1fd12c9d3011e.tar.xz
netdata-1e6c93250172946eeb38e94a92a1fd12c9d3011e.zip
108 files changed, 15985 insertions, 458 deletions
diff --git a/web/api/Makefile.am b/web/api/Makefile.am
new file mode 100644
index 000000000..5755612c8
--- /dev/null
+++ b/web/api/Makefile.am
@@ -0,0 +1,20 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+AUTOMAKE_OPTIONS = subdir-objects
+MAINTAINERCLEANFILES = $(srcdir)/Makefile.in
+
+SUBDIRS = \
+    badges \
+    queries \
+    exporters \
+    formatters \
+    $(NULL)
+
+dist_noinst_DATA = \
+	README.md \
+	$(NULL)
+
+dist_web_DATA = \
+	netdata-swagger.yaml \
+	netdata-swagger.json \
+	$(NULL)
diff --git a/web/api/Makefile.in b/web/api/Makefile.in
new file mode 100644
index 000000000..7bcd57e1a
--- /dev/null
+++ b/web/api/Makefile.in
@@ -0,0 +1,709 @@
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diff --git a/web/api/README.md b/web/api/README.md
new file mode 100644
index 000000000..973d1bb6b
--- /dev/null
+++ b/web/api/README.md
@@ -0,0 +1,18 @@
+# netdata REST API
+
+The complete documentation of the netdata API is available at the **[Swagger Editor](https://editor.swagger.io/?url=https://raw.githubusercontent.com/netdata/netdata/master/web/api/netdata-swagger.yaml)**.
+
+If your prefer it over the Swagger Editor, you can also use **[Swagger UI](https://registry.my-netdata.io/swagger/#!/default/get_data)**. This however does not provide all the information available.
+
+## google charts
+
+netdata is a [Google Visualization API datatable and datasource provider](https://developers.google.com/chart/interactive/docs/reference), so it can directly be used with [Google Charts](https://developers.google.com/chart/interactive/docs/).
+
+Check this [single chart, jsfiddle example](https://jsfiddle.net/ktsaou/ensu4uws/9/):
+
+![image](https://cloud.githubusercontent.com/assets/2662304/23824762/1e236b84-0685-11e7-89f4-06fdf67d873a.png)
+
+and this [multi chart, jsfiddle example](https://jsfiddle.net/ktsaou/L5y2eqp2/):
+
+![image](https://cloud.githubusercontent.com/assets/2662304/23824766/31a4a68c-0685-11e7-8429-8327cab64be2.png)
+
diff --git a/web/api/badges/Makefile.am b/web/api/badges/Makefile.am
new file mode 100644
index 000000000..19554bed8
--- /dev/null
+++ b/web/api/badges/Makefile.am
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diff --git a/web/api/badges/Makefile.in b/web/api/badges/Makefile.in
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index 000000000..79a3a17a2
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+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --gnu web/api/badges/Makefile
+.PRECIOUS: Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+	@case '$?' in \
+	  *config.status*) \
+	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
+	  *) \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__depfiles_maybe)'; \
+	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__depfiles_maybe);; \
+	esac;
+
+$(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+
+$(top_srcdir)/configure: @MAINTAINER_MODE_TRUE@ $(am__configure_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(ACLOCAL_M4): @MAINTAINER_MODE_TRUE@ $(am__aclocal_m4_deps)
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+distdir: $(DISTFILES)
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+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
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+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
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+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
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+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: check-am
+all-am: Makefile $(DATA)
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+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
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+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
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+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+	-test -z "$(MAINTAINERCLEANFILES)" || rm -f $(MAINTAINERCLEANFILES)
+clean: clean-am
+
+clean-am: clean-generic mostlyclean-am
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+distclean: distclean-am
+	-rm -f Makefile
+distclean-am: clean-am distclean-generic
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+dvi: dvi-am
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+dvi-am:
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+html: html-am
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+html-am:
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+install-dvi-am:
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+install-exec-am:
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+.PHONY: all all-am check check-am clean clean-generic cscopelist-am \
+	ctags-am distclean distclean-generic distdir dvi dvi-am html \
+	html-am info info-am install install-am install-data \
+	install-data-am install-dvi install-dvi-am install-exec \
+	install-exec-am install-html install-html-am install-info \
+	install-info-am install-man install-pdf install-pdf-am \
+	install-ps install-ps-am install-strip installcheck \
+	installcheck-am installdirs maintainer-clean \
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+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/web/api/badges/README.md b/web/api/badges/README.md
new file mode 100644
index 000000000..cf0b22bea
--- /dev/null
+++ b/web/api/badges/README.md
@@ -0,0 +1,324 @@
+# Netdata badges
+
+**Badges are cool!**
+
+Netdata can generate badges for any chart and any dimension at any time-frame. Badges come in `SVG` and can be added to any web page using an `<IMG>` HTML tag.
+
+**Netdata badges are powerful**!
+
+Given that netdata collects from **1.000** to **5.000** metrics per server (depending on the number of network interfaces, disks, cpu cores, applications running, users logged in, containers running, etc) and that netdata already has data reduction/aggregation functions embedded, the badges can be quite powerful.
+
+For each metric/dimension and for arbitrary time-frames badges can show **min**, **max** or **average** value, but also **sum** or **incremental-sum** to have their **volume**.
+
+For example, there is [a chart in netdata that shows the current requests/s of nginx](http://london.my-netdata.io/#nginx_local_nginx). Using this chart alone we can show the following badges (we could add more time-frames, like **today**, **yesterday**, etc):
+
+<a href="https://registry.my-netdata.io/#nginx_local_nginx"><img src="https://registry.my-netdata.io/api/v1/badge.svg?chart=nginx_local.connections&dimensions=active&value_color=grey:null%7Cblue&label=nginx%20active%20connections%20now&units=null&precision=0"/></a>  <a href="https://registry.my-netdata.io/#nginx_local_nginx"><img src="https://registry.my-netdata.io/api/v1/badge.svg?chart=nginx_local.connections&dimensions=active&after=-3600&value_color=orange&label=last%20hour%20average&units=null&options=unaligned&precision=0"/></a> <a href="https://registry.my-netdata.io/#nginx_local_nginx"><img src="https://registry.my-netdata.io/api/v1/badge.svg?chart=nginx_local.connections&dimensions=active&group=max&after=-3600&value_color=red&label=last%20hour%20max&units=null&options=unaligned&precision=0"/></a>
+
+Similarly, there is [a chart that shows outbound bandwidth per class](http://london.my-netdata.io/#tc_eth0), using QoS data. So it shows `kilobits/s` per class. Using this chart we can show:
+
+<a href="https://registry.my-netdata.io/#tc_eth0"><img src="https://registry.my-netdata.io/api/v1/badge.svg?chart=tc.world_out&dimensions=web_server&value_color=green&label=web%20server%20sends%20now&units=kbps"/></a> <a href="https://registry.my-netdata.io/#tc_eth0"><img src="https://registry.my-netdata.io/api/v1/badge.svg?chart=tc.world_out&dimensions=web_server&after=-86400&options=unaligned&group=sum&divide=8388608&value_color=blue&label=web%20server%20sent%20today&units=GB"/></a>
+
+The right one is a **volume** calculation. Netdata calculated the total of the last 86.400 seconds (a day) which gives `kilobits`, then divided it by 8 to make it KB, then by 1024 to make it MB and then by 1024 to make it GB. Calculations like this are quite accurate, since for every value collected, every second, netdata interpolates it to second boundary using microsecond calculations.
+
+Let's see a few more badge examples (they come from the [netdata registry](https://github.com/netdata/netdata/wiki/mynetdata-menu-item)):
+
+- **cpu usage of user `root`** (you can pick any user; 100% = 1 core). This will be `green <10%`, `yellow <20%`, `orange <50%`, `blue <100%` (1 core), `red` otherwise (you define thresholds and colors on the URL).
+
+  <a href="https://registry.my-netdata.io/#apps_cpu"><img src="https://registry.my-netdata.io/api/v1/badge.svg?chart=users.cpu&dimensions=root&value_color=grey:null%7Cgreen%3C10%7Cyellow%3C20%7Corange%3C50%7Cblue%3C100%7Cred&label=root%20user%20cpu%20now&units=%25"></img></a> <a href="https://registry.my-netdata.io/#apps_cpu"><img src="https://registry.my-netdata.io/api/v1/badge.svg?chart=users.cpu&dimensions=root&after=-3600&value_color=grey:null%7Cgreen%3C10%7Cyellow%3C20%7Corange%3C50%7Cblue%3C100%7Cred&label=root%20user%20average%20cpu%20last%20hour&units=%25"></img></a>
+
+- **mysql queries per second**
+
+  <a href="https://registry.my-netdata.io/#mysql_local"><img src="https://registry.my-netdata.io/api/v1/badge.svg?chart=mysql_local.queries&dimensions=questions&label=mysql%20queries%20now&value_color=red&units=%5Cs"></img></a> <a href="https://registry.my-netdata.io/#mysql_local"><img src="https://registry.my-netdata.io/api/v1/badge.svg?chart=mysql_local.queries&dimensions=questions&after=-3600&options=unaligned&group=sum&label=mysql%20queries%20this%20hour&value_color=green&units=null"></img></a> <a href="https://registry.my-netdata.io/#mysql_local"><img src="https://registry.my-netdata.io/api/v1/badge.svg?chart=mysql_local.queries&dimensions=questions&after=-86400&options=unaligned&group=sum&label=mysql%20queries%20today&value_color=blue&units=null"></img></a>
+
+  niche ones: **mysql SELECT statements with JOIN, which did full table scans**:
+
+  <a href="https://registry.my-netdata.io/#mysql_local_issues"><img src="https://registry.my-netdata.io/api/v1/badge.svg?chart=mysql_local.join_issues&dimensions=scan&after=-3600&label=full%20table%20scans%20the%20last%20hour&value_color=orange&group=sum&units=null"></img></a>
+
+---
+
+> So, every single line on the charts of a [netdata dashboard](http://london.my-netdata.io/), can become a badge and this badge can calculate **average**, **min**, **max**, or **volume** for any time-frame! And you can also vary the badge color using conditions on the calculated value.
+
+---
+
+## How to create badges
+
+The basic URL is `http://your.netdata:19999/api/v1/badge.svg?option1&option2&option3&...`.
+
+Here is what you can put for `options` (these are standard netdata API options):
+
+- `chart=CHART.NAME`
+
+  The chart to get the values from.
+
+  **This is the only parameter required** and with just this parameter, netdata will return the sum of the latest values of all chart dimensions.
+
+  Example:
+
+```html
+  <a href="#">
+     <img src="http://registry.my-netdata.io/api/v1/badge.svg?chart=system.cpu"></img>
+  </a>
+```
+
+  Which produces this:
+
+  <a href="#">
+     <img src="http://registry.my-netdata.io/api/v1/badge.svg?chart=system.cpu"></img>
+  </a>
+
+- `alarm=NAME`
+
+  Render the current value and status of an alarm linked to the chart. This option can be ignored if the badge to be generated is not related to an alarm.
+
+  The current value of the alarm will be rendered. The color of the badge will indicate the status of the alarm.
+
+  For alarm badges, **both `chart` and `alarm` parameters are required**.
+
+- `dimensions=DIMENSION1|DIMENSION2|...`
+
+  The dimensions of the chart to use. If you don't set any dimension, all will be used. When multiple dimensions are used, netdata will sum their values. You can append `options=absolute` if you want this sum to convert all values to positive before adding them.
+
+  Pipes in HTML have to escaped with `%7C`.
+
+  Example:
+
+```html
+  <a href="#">
+     <img src="http://registry.my-netdata.io/api/v1/badge.svg?chart=system.cpu&dimensions=system%7Cnice"></img>
+  </a>
+```
+
+  Which produces this:
+
+  <a href="#">
+     <img src="http://registry.my-netdata.io/api/v1/badge.svg?chart=system.cpu&dimensions=system%7Cnice"></img>
+  </a>
+
+- `before=SECONDS` and `after=SECONDS`
+
+  The timeframe. These can be absolute unix timestamps, or relative to now, number of seconds. By default `before=0` and `after=-1` (1 second in the past).
+
+  To get the last minute set `after=-60`. This will give the average of the last complete minute (XX:XX:00 - XX:XX:59).
+
+  To get the max of the last hour set `after=-3600&group=max`. This will give the maximum value of the last complete hour (XX:00:00 - XX:59:59)
+
+  Example:
+
+```html
+  <a href="#">
+     <img src="http://registry.my-netdata.io/api/v1/badge.svg?chart=system.cpu&after=-60"></img>
+  </a>
+```
+
+  Which produces the average of last complete minute (XX:XX:00 - XX:XX:59):
+
+  <a href="#">
+     <img src="http://registry.my-netdata.io/api/v1/badge.svg?chart=system.cpu&after=-60"></img>
+  </a>
+
+  While this is the previous minute (one minute before the last one, again aligned XX:XX:00 - XX:XX:59):
+
+```html
+  <a href="#">
+     <img src="http://registry.my-netdata.io/api/v1/badge.svg?chart=system.cpu&before=-60&after=-60"></img>
+  </a>
+```
+
+  It produces this:
+  
+  <a href="#">
+     <img src="http://registry.my-netdata.io/api/v1/badge.svg?chart=system.cpu&before=-60&after=-60"></img>
+  </a>
+
+- `group=min` or `group=max` or `group=average` (the default) or `group=sum` or `group=incremental-sum`
+
+  If netdata will have to reduce (aggregate) the data to calculate the value, which aggregation method to use.
+
+  - `max` will find the max value for the timeframe. This works on both positive and negative dimensions. It will find the most extreme value.
+
+  - `min` will find the min value for the timeframe. This works on both positive and negative dimensions. It will find the number closest to zero.
+
+  - `average` will calculate the average value for the timeframe.
+
+  - `sum` will sum all the values for the timeframe. This is nice for finding the volume of dimensions for a timeframe. So if you have a dimension that reports `X per second`, you can find the volume of the dimension in a timeframe, by adding its values in that timeframe.
+
+  - `incremental-sum` will sum the difference of each value to its next. Let's assume you have a dimension that does not measure the rate of something, but the absolute value of it. So it has values like this "1, 5, 3, 7, 4". `incremental-sum` will calculate the difference of adjacent values. In this example, they will be `(5 - 1) + (3 - 5) + (7 - 3) + (4 - 7) = 3` (which is equal to the last value minus the first = 4 - 1).
+
+- `options=opt1|opt2|opt3|...`
+
+  These fine tune various options of the API. Here is what you can use for badges (the API has more option, but only these are useful for badges):
+
+  - `percentage`, instead of returning the value, calculate the percentage of the sum of the selected dimensions, versus the sum of all the dimensions of the chart. This also sets the units to `%`.
+
+  - `absolute` or `abs`, turn all values positive and then sum them.
+
+  - `display_absolute` or `display-absolute`, to use the signed value during color calculation, but display the absolute value on the badge.
+
+  - `min2max`, when multiple dimensions are given, do not sum them, but take their `max - min`.
+
+  - `unaligned`, when data are reduced / aggregated (e.g. the request is about the average of the last minute, or hour), netdata by default aligns them so that the charts will have a constant shape (so average per minute returns always XX:XX:00 - XX:XX:59). Setting the `unaligned` option, netdata will aggregate data without any alignment, so if the request is for 60 seconds, it will aggregate the latest 60 seconds of collected data.
+
+These are options dedicated to badges:
+
+- `label=TEXT`
+
+  The label of the badge.
+
+- `units=TEXT`
+
+  The units of the badge. If you want to put a `/`, please put a `\`. This is because netdata allows badges parameters to be given as path in URL, instead of query string. You can also use `null` or `empty` to show it without any units.
+
+  The units `seconds`, `minutes` and `hours` trigger special formatting. The value has to be in this unit, and netdata will automatically change it to show a more pretty duration.
+
+- `multiply=NUMBER`
+
+  Multiply the value with this number. The default is `1`.
+
+- `divide=NUMBER`
+
+  Divide the value with this number. The default is `1`.
+
+- `label_color=COLOR`
+
+  The color of the label (the left part). You can use any HTML color, include `#NNN` and `#NNNNNN`. The following colors are defined in netdata (and you can use them by name): `green`, `brightgreen`, `yellow`, `yellowgreen`, `orange`, `red`, `blue`, `grey`, `gray`, `lightgrey`, `lightgray`. These are taken from https://github.com/badges/shields so they are compatible with standard badges.
+
+- `value_color=COLOR:null|COLOR<VALUE|COLOR>VALUE|COLOR>=VALUE|COLOR<=VALUE|...`
+
+  You can add a pipe delimited list of conditions to pick the color. The first matching (left to right) will be used.
+
+  Example: `value_color=grey:null|green<10|yellow<100|orange<1000|blue<10000|red`
+
+  The above will set `grey` if no value exists (not collected within the `gap when lost iterations above` in netdata.conf for the chart), `green` if the value is less than 10, `yellow` if the value is less than 100, etc up to `red` which will be used if no other conditions match.
+
+  The supported operators are `<`, `>`, `<=`, `>=`, `=` (or `:`) and `!=` (or `<>`).
+
+- `precision=NUMBER`
+
+  The number of decimal digits of the value. By default netdata will add:
+
+  - no decimal digits for values > 1000
+  - 1 decimal digit for values > 100
+  - 2 decimal digits for values > 1
+  - 3 decimal digits for values > 0.1
+  - 4 decimal digits for values <= 0.1
+
+  Using the `precision=NUMBER` you can set your preference per badge.
+
+- `scale=XXX`
+
+  This option scales the svg image. It accepts values above or equal to 100 (100% is the default scale). For example, lets get a few different sizes:
+
+     <img src="http://registry.my-netdata.io/api/v1/badge.svg?chart=system.cpu&after=-60&scale=100"></img> original<br/>
+     <img src="http://registry.my-netdata.io/api/v1/badge.svg?chart=system.cpu&after=-60&scale=125"></img> `scale=125`<br/>
+     <img src="http://registry.my-netdata.io/api/v1/badge.svg?chart=system.cpu&after=-60&scale=150"></img> `scale=150`<br/>
+     <img src="http://registry.my-netdata.io/api/v1/badge.svg?chart=system.cpu&after=-60&scale=175"></img> `scale=175`<br/>
+     <img src="http://registry.my-netdata.io/api/v1/badge.svg?chart=system.cpu&after=-60&scale=200"></img> `scale=200`
+
+
+- `refresh=auto` or `refresh=SECONDS`
+
+  This option enables auto-refreshing of images. netdata will send the HTTP header `Refresh: SECONDS` to the web browser, thus requesting automatic refresh of the images at regular intervals.
+
+  `auto` will calculate the proper `SECONDS` to avoid unnecessary refreshes. If `SECONDS` is zero, this feature is disabled (it is also disabled by default).
+
+  Auto-refreshing like this, works only if you access the badge directly. So, you may have to put it an `embed` or `iframe` for it to be auto-refreshed. Use something like this:
+
+```html
+<embed src="BADGE_URL" type="image/svg+xml" height="20" />
+```
+
+  Another way is to use javascript to auto-refresh them. You can auto-refresh all the netdata badges on a page using javascript. You have to add a class to all the netdata badges, like this `<img class="netdata-badge" src="..."/>`. Then add this javascript code to your page (it requires jquery):
+
+```html
+<script>
+    var NETDATA_BADGES_AUTOREFRESH_SECONDS = 5;
+    function refreshNetdataBadges() {
+      var now = new Date().getTime().toString();
+      $('.netdata-badge').each(function() {
+        this.src = this.src.replace(/\&_=\d*/, '') + '&_=' + now;
+      });
+      setTimeout(refreshNetdataBadges, NETDATA_BADGES_AUTOREFRESH_SECONDS * 1000);
+    }
+    setTimeout(refreshNetdataBadges, NETDATA_BADGES_AUTOREFRESH_SECONDS * 1000);
+</script>
+```
+
+A more advanced badges refresh method is to include `http://your.netdata.ip:19999/refresh-badges.js` in your page. For more information and use example, [check this](https://github.com/netdata/netdata/blob/master/web/gui/refresh-badges.js).
+
+---
+
+## Escaping URLs
+
+Keep in mind that if you add badge URLs to your HTML pages you have to escape the special characters:
+
+character|name|escape sequence
+:-------:|:--:|:-------------:
+`   `|space (in labels and units)|`%20`
+` # `|hash (for colors)|`%23`
+` % `|percent (in units)|`%25`
+` < `|less than|`%3C`
+` > `|greater than|`%3E`
+` \ `|backslash (when you need a `/`)|`%5C`
+` \| `|pipe (delimiting parameters)|`%7C`
+
+---
+
+## Using the path instead of the query string
+
+The badges can also be generated using the URL path for passing parameters. The format is exactly the same.
+
+So instead of:
+
+  `http://your.netdata:19999/api/v1/badge.svg?option1&option2&option3&...`
+
+you can write:
+
+  `http://your.netdata:19999/api/v1/badge.svg/option1/option2/option3/...`
+
+You can also append anything else you like, like this:
+
+  `http://your.netdata:19999/api/v1/badge.svg/option1/option2/option3/my-super-badge.svg`
+
+## FAQ
+
+#### Is it fast?
+On modern hardware, netdata can generate about **2.000 badges per second per core**, before noticing any delays. It generates a badge in about half a millisecond!
+
+Of course these timing are for badges that use recent data. If you need badges that do calculations over long durations (a day, or more), timing will differ. netdata logs its timings at its `access.log`, so take a look there before adding a heavy badge on a busy web site. Of course, you can cache such badges or have a cron job get them from netdata and save them at your web server at regular intervals.
+
+
+#### Embedding badges in github
+
+You have 2 options a) SVG images with markdown and b) SVG images with HTML (directly in .md files).
+
+For example, this is the cpu badge shown above:
+
+- Markdown example:
+
+```md
+[![A nice name](https://registry.my-netdata.io/api/v1/badge.svg?chart=users.cpu&dimensions=root&value_color=grey:null%7Cgreen%3C10%7Cyellow%3C20%7Corange%3C50%7Cblue%3C100%7Cred&label=root%20user%20cpu%20now&units=%25)](https://registry.my-netdata.io/#apps_cpu)
+```
+
+- HTML example:
+
+```html
+<a href="https://registry.my-netdata.io/#apps_cpu">
+    <img src="https://registry.my-netdata.io/api/v1/badge.svg?chart=users.cpu&dimensions=root&value_color=grey:null%7Cgreen%3C10%7Cyellow%3C20%7Corange%3C50%7Cblue%3C100%7Cred&label=root%20user%20cpu%20now&units=%25"></img>
+</a>
+```
+
+Both produce this:
+
+<a href="https://registry.my-netdata.io/#apps_cpu">
+    <img src="https://registry.my-netdata.io/api/v1/badge.svg?chart=users.cpu&dimensions=root&value_color=grey:null%7Cgreen%3C10%7Cyellow%3C20%7Corange%3C50%7Cblue%3C100%7Cred&label=root%20user%20cpu%20now&units=%25"></img>
+</a>
+
+#### auto-refreshing badges in github
+
+Unfortunately it cannot be done. Github fetches all the images using a proxy and rewrites all the URLs to be served by the proxy.
+
+You can refresh them from your browser console though. Press F12 to open the web browser console (switch to the console too), paste the following and press enter. They will refresh:
+
+```js
+var len = document.images.length; while(len--) { document.images[len].src = document.images[len].src.replace(/\?cacheBuster=\d*/, "") + "?cacheBuster=" + new Date().getTime().toString(); };
+```
+\ No newline at end of file
diff --git a/src/web_buffer_svg.c b/web/api/badges/web_buffer_svg.c
index c05e526ed..d0600359e 100644
--- a/src/web_buffer_svg.c
+++ b/web/api/badges/web_buffer_svg.c
@@ -1,4 +1,6 @@
-#include "common.h"
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "web_buffer_svg.h"
 
 #define BADGE_HORIZONTAL_PADDING 4
 #define VERDANA_KERNING 0.2
@@ -9,7 +11,7 @@
  * https://github.com/badges/shields/blob/master/measure-text.js
 */
 
-double verdana11_widths[256] = {
+static double verdana11_widths[256] = {
     [0] = 0.0,
     [1] = 0.0,
     [2] = 0.0,
@@ -428,57 +430,91 @@ static inline char *format_value_with_precision_and_unit(char *value_string, siz
     return value_string;
 }
 
+typedef enum badge_units_format {
+    UNITS_FORMAT_NONE,
+    UNITS_FORMAT_SECONDS,
+    UNITS_FORMAT_SECONDS_AGO,
+    UNITS_FORMAT_MINUTES,
+    UNITS_FORMAT_MINUTES_AGO,
+    UNITS_FORMAT_HOURS,
+    UNITS_FORMAT_HOURS_AGO,
+    UNITS_FORMAT_ONOFF,
+    UNITS_FORMAT_UPDOWN,
+    UNITS_FORMAT_OKERROR,
+    UNITS_FORMAT_OKFAILED,
+    UNITS_FORMAT_EMPTY,
+    UNITS_FORMAT_PERCENT
+} UNITS_FORMAT;
+
+
+static struct units_formatter {
+    const char *units;
+    uint32_t hash;
+    UNITS_FORMAT format;
+} badge_units_formatters[] = {
+        { "seconds",     0, UNITS_FORMAT_SECONDS },
+        { "seconds ago", 0, UNITS_FORMAT_SECONDS_AGO },
+        { "minutes",     0, UNITS_FORMAT_MINUTES },
+        { "minutes ago", 0, UNITS_FORMAT_MINUTES_AGO },
+        { "hours",       0, UNITS_FORMAT_HOURS },
+        { "hours ago",   0, UNITS_FORMAT_HOURS_AGO },
+        { "on/off",      0, UNITS_FORMAT_ONOFF },
+        { "on-off",      0, UNITS_FORMAT_ONOFF },
+        { "onoff",       0, UNITS_FORMAT_ONOFF },
+        { "up/down",     0, UNITS_FORMAT_UPDOWN },
+        { "up-down",     0, UNITS_FORMAT_UPDOWN },
+        { "updown",      0, UNITS_FORMAT_UPDOWN },
+        { "ok/error",    0, UNITS_FORMAT_OKERROR },
+        { "ok-error",    0, UNITS_FORMAT_OKERROR },
+        { "okerror",     0, UNITS_FORMAT_OKERROR },
+        { "ok/failed",   0, UNITS_FORMAT_OKFAILED },
+        { "ok-failed",   0, UNITS_FORMAT_OKFAILED },
+        { "okfailed",    0, UNITS_FORMAT_OKFAILED },
+        { "empty",       0, UNITS_FORMAT_EMPTY },
+        { "null",        0, UNITS_FORMAT_EMPTY },
+        { "percentage",  0, UNITS_FORMAT_PERCENT },
+        { "percent",     0, UNITS_FORMAT_PERCENT },
+        { "pcent",       0, UNITS_FORMAT_PERCENT },
+
+        // terminator
+        { NULL,          0, UNITS_FORMAT_NONE }
+};
+
 inline char *format_value_and_unit(char *value_string, size_t value_string_len, calculated_number value, const char *units, int precision) {
-    static uint32_t
-            hash_seconds = 0,
-            hash_seconds_ago = 0,
-            hash_minutes = 0,
-            hash_minutes_ago = 0,
-            hash_hours = 0,
-            hash_hours_ago = 0,
-            hash_onoff = 0,
-            hash_updown = 0,
-            hash_okerror = 0,
-            hash_okfailed = 0,
-            hash_empty = 0,
-            hash_null = 0,
-            hash_percentage = 0,
-            hash_percent = 0,
-            hash_pcent = 0;
-
-    if(unlikely(!hash_seconds)) {
-        hash_seconds     = simple_hash("seconds");
-        hash_seconds_ago = simple_hash("seconds ago");
-        hash_minutes     = simple_hash("minutes");
-        hash_minutes_ago = simple_hash("minutes ago");
-        hash_hours       = simple_hash("hours");
-        hash_hours_ago   = simple_hash("hours ago");
-        hash_onoff       = simple_hash("on/off");
-        hash_updown      = simple_hash("up/down");
-        hash_okerror     = simple_hash("ok/error");
-        hash_okfailed    = simple_hash("ok/failed");
-        hash_empty       = simple_hash("empty");
-        hash_null        = simple_hash("null");
-        hash_percentage  = simple_hash("percentage");
-        hash_percent     = simple_hash("percent");
-        hash_pcent       = simple_hash("pcent");
+    static int max = -1;
+    int i;
+
+    if(unlikely(max == -1)) {
+        for(i = 0; badge_units_formatters[i].units; i++)
+            badge_units_formatters[i].hash = simple_hash(badge_units_formatters[i].units);
+
+        max = i;
     }
 
     if(unlikely(!units)) units = "";
-
     uint32_t hash_units = simple_hash(units);
 
-    if(unlikely((hash_units == hash_seconds && !strcmp(units, "seconds")) || (hash_units == hash_seconds_ago && !strcmp(units, "seconds ago")))) {
+    UNITS_FORMAT format = UNITS_FORMAT_NONE;
+    for(i = 0; i < max; i++) {
+        struct units_formatter *ptr = &badge_units_formatters[i];
+
+        if(hash_units == ptr->hash && !strcmp(units, ptr->units)) {
+            format = ptr->format;
+            break;
+        }
+    }
+
+    if(unlikely(format == UNITS_FORMAT_SECONDS || format == UNITS_FORMAT_SECONDS_AGO)) {
         if(value == 0.0) {
             snprintfz(value_string, value_string_len, "%s", "now");
             return value_string;
         }
         else if(isnan(value) || isinf(value)) {
-            snprintfz(value_string, value_string_len, "%s", "never");
+            snprintfz(value_string, value_string_len, "%s", "undefined");
             return value_string;
         }
 
-        const char *suffix = (hash_units == hash_seconds_ago)?" ago":"";
+        const char *suffix = (format == UNITS_FORMAT_SECONDS_AGO)?" ago":"";
 
         size_t s = (size_t)value;
         size_t d = s / 86400;
@@ -498,17 +534,17 @@ inline char *format_value_and_unit(char *value_string, size_t value_string_len,
         return value_string;
     }
 
-    else if(unlikely((hash_units == hash_minutes && !strcmp(units, "minutes")) || (hash_units == hash_minutes_ago && !strcmp(units, "minutes ago")))) {
+    else if(unlikely(format == UNITS_FORMAT_MINUTES || format == UNITS_FORMAT_MINUTES_AGO)) {
         if(value == 0.0) {
             snprintfz(value_string, value_string_len, "%s", "now");
             return value_string;
         }
         else if(isnan(value) || isinf(value)) {
-            snprintfz(value_string, value_string_len, "%s", "never");
+            snprintfz(value_string, value_string_len, "%s", "undefined");
             return value_string;
         }
 
-        const char *suffix = (hash_units == hash_minutes_ago)?" ago":"";
+        const char *suffix = (format == UNITS_FORMAT_MINUTES_AGO)?" ago":"";
 
         size_t m = (size_t)value;
         size_t d = m / (60 * 24);
@@ -525,17 +561,17 @@ inline char *format_value_and_unit(char *value_string, size_t value_string_len,
         return value_string;
     }
 
-    else if(unlikely((hash_units == hash_hours && !strcmp(units, "hours")) || (hash_units == hash_hours_ago && !strcmp(units, "hours ago")))) {
+    else if(unlikely(format == UNITS_FORMAT_HOURS || format == UNITS_FORMAT_HOURS_AGO)) {
         if(value == 0.0) {
             snprintfz(value_string, value_string_len, "%s", "now");
             return value_string;
         }
         else if(isnan(value) || isinf(value)) {
-            snprintfz(value_string, value_string_len, "%s", "never");
+            snprintfz(value_string, value_string_len, "%s", "undefined");
             return value_string;
         }
 
-        const char *suffix = (hash_units == hash_hours_ago)?" ago":"";
+        const char *suffix = (format == UNITS_FORMAT_HOURS_AGO)?" ago":"";
 
         size_t h = (size_t)value;
         size_t d = h / 24;
@@ -549,42 +585,32 @@ inline char *format_value_and_unit(char *value_string, size_t value_string_len,
         return value_string;
     }
 
-    else if(unlikely(hash_units == hash_onoff && !strcmp(units, "on/off"))) {
+    else if(unlikely(format == UNITS_FORMAT_ONOFF)) {
         snprintfz(value_string, value_string_len, "%s", (value != 0.0)?"on":"off");
         return value_string;
     }
 
-    else if(unlikely(hash_units == hash_updown && !strcmp(units, "up/down"))) {
+    else if(unlikely(format == UNITS_FORMAT_UPDOWN)) {
         snprintfz(value_string, value_string_len, "%s", (value != 0.0)?"up":"down");
         return value_string;
     }
 
-    else if(unlikely(hash_units == hash_okerror && !strcmp(units, "ok/error"))) {
+    else if(unlikely(format == UNITS_FORMAT_OKERROR)) {
         snprintfz(value_string, value_string_len, "%s", (value != 0.0)?"ok":"error");
         return value_string;
     }
 
-    else if(unlikely(hash_units == hash_okfailed && !strcmp(units, "ok/failed"))) {
+    else if(unlikely(format == UNITS_FORMAT_OKFAILED)) {
         snprintfz(value_string, value_string_len, "%s", (value != 0.0)?"ok":"failed");
         return value_string;
     }
 
-    else if(unlikely(hash_units == hash_empty && !strcmp(units, "empty")))
+    else if(unlikely(format == UNITS_FORMAT_EMPTY))
         units = "";
 
-    else if(unlikely(hash_units == hash_null && !strcmp(units, "null")))
-        units = "";
-
-    else if(unlikely(hash_units == hash_percentage && !strcmp(units, "percentage")))
-        units = "%";
-
-    else if(unlikely(hash_units == hash_percent && !strcmp(units, "percent")))
-        units = "%";
-
-    else if(unlikely(hash_units == hash_pcent && !strcmp(units, "pcent")))
+    else if(unlikely(format == UNITS_FORMAT_PERCENT))
         units = "%";
 
-
     if(unlikely(isnan(value) || isinf(value))) {
         strcpy(value_string, "-");
         return value_string;
@@ -593,20 +619,51 @@ inline char *format_value_and_unit(char *value_string, size_t value_string_len,
     return format_value_with_precision_and_unit(value_string, value_string_len, value, units, precision);
 }
 
+static struct badge_color {
+    const char *name;
+    uint32_t hash;
+    const char *color;
+} badge_colors[] = {
+
+        // colors from:
+        // https://github.com/badges/shields/blob/master/colorscheme.json
+
+        { "brightgreen", 0, "#4c1"    },
+        { "green",       0, "#97CA00" },
+        { "yellow",      0, "#dfb317" },
+        { "yellowgreen", 0, "#a4a61d" },
+        { "orange",      0, "#fe7d37" },
+        { "red",         0, "#e05d44" },
+        { "blue",        0, "#007ec6" },
+        { "grey",        0, "#555"    },
+        { "gray",        0, "#555"    },
+        { "lightgrey",   0, "#9f9f9f" },
+        { "lightgray",   0, "#9f9f9f" },
+
+        // terminator
+        { NULL,          0, NULL      }
+};
+
 static inline const char *color_map(const char *color) {
-    // colors from:
-    // https://github.com/badges/shields/blob/master/colorscheme.json
-         if(!strcmp(color, "brightgreen")) return "#4c1";
-    else if(!strcmp(color, "green"))       return "#97CA00";
-    else if(!strcmp(color, "yellow"))      return "#dfb317";
-    else if(!strcmp(color, "yellowgreen")) return "#a4a61d";
-    else if(!strcmp(color, "orange"))      return "#fe7d37";
-    else if(!strcmp(color, "red"))         return "#e05d44";
-    else if(!strcmp(color, "blue"))        return "#007ec6";
-    else if(!strcmp(color, "grey"))        return "#555";
-    else if(!strcmp(color, "gray"))        return "#555";
-    else if(!strcmp(color, "lightgrey"))   return "#9f9f9f";
-    else if(!strcmp(color, "lightgray"))   return "#9f9f9f";
+    static int max = -1;
+    int i;
+
+    if(unlikely(max == -1)) {
+        for(i = 0; badge_colors[i].name ;i++)
+            badge_colors[i].hash = simple_hash(badge_colors[i].name);
+
+        max = i;
+    }
+
+    uint32_t hash = simple_hash(color);
+
+    for(i = 0; i < max; i++) {
+        struct badge_color *ptr = &badge_colors[i];
+
+        if(hash == ptr->hash && !strcmp(color, ptr->name))
+            return ptr->color;
+    }
+
     return color;
 }
 
@@ -830,3 +887,256 @@ void buffer_svg(BUFFER *wb, const char *label, calculated_number value, const ch
         label_width + value_width / 2 -1, ceil(height - text_offset), value_escaped,
         label_width + value_width / 2 -1, ceil(height - text_offset - 1.0), value_escaped);
 }
+
+int web_client_api_request_v1_badge(RRDHOST *host, struct web_client *w, char *url) {
+    int ret = 400;
+    buffer_flush(w->response.data);
+
+    BUFFER *dimensions = NULL;
+
+    const char *chart = NULL
+    , *before_str = NULL
+    , *after_str = NULL
+    , *points_str = NULL
+    , *multiply_str = NULL
+    , *divide_str = NULL
+    , *label = NULL
+    , *units = NULL
+    , *label_color = NULL
+    , *value_color = NULL
+    , *refresh_str = NULL
+    , *precision_str = NULL
+    , *scale_str = NULL
+    , *alarm = NULL;
+
+    int group = RRDR_GROUPING_AVERAGE;
+    uint32_t options = 0x00000000;
+
+    while(url) {
+        char *value = mystrsep(&url, "/?&");
+        if(!value || !*value) continue;
+
+        char *name = mystrsep(&value, "=");
+        if(!name || !*name) continue;
+        if(!value || !*value) continue;
+
+        debug(D_WEB_CLIENT, "%llu: API v1 badge.svg query param '%s' with value '%s'", w->id, name, value);
+
+        // name and value are now the parameters
+        // they are not null and not empty
+
+        if(!strcmp(name, "chart")) chart = value;
+        else if(!strcmp(name, "dimension") || !strcmp(name, "dim") || !strcmp(name, "dimensions") || !strcmp(name, "dims")) {
+            if(!dimensions)
+                dimensions = buffer_create(100);
+
+            buffer_strcat(dimensions, "|");
+            buffer_strcat(dimensions, value);
+        }
+        else if(!strcmp(name, "after")) after_str = value;
+        else if(!strcmp(name, "before")) before_str = value;
+        else if(!strcmp(name, "points")) points_str = value;
+        else if(!strcmp(name, "group")) {
+            group = web_client_api_request_v1_data_group(value, RRDR_GROUPING_AVERAGE);
+        }
+        else if(!strcmp(name, "options")) {
+            options |= web_client_api_request_v1_data_options(value);
+        }
+        else if(!strcmp(name, "label")) label = value;
+        else if(!strcmp(name, "units")) units = value;
+        else if(!strcmp(name, "label_color")) label_color = value;
+        else if(!strcmp(name, "value_color")) value_color = value;
+        else if(!strcmp(name, "multiply")) multiply_str = value;
+        else if(!strcmp(name, "divide")) divide_str = value;
+        else if(!strcmp(name, "refresh")) refresh_str = value;
+        else if(!strcmp(name, "precision")) precision_str = value;
+        else if(!strcmp(name, "scale")) scale_str = value;
+        else if(!strcmp(name, "alarm")) alarm = value;
+    }
+
+    if(!chart || !*chart) {
+        buffer_no_cacheable(w->response.data);
+        buffer_sprintf(w->response.data, "No chart id is given at the request.");
+        goto cleanup;
+    }
+
+    int scale = (scale_str && *scale_str)?str2i(scale_str):100;
+
+    RRDSET *st = rrdset_find(host, chart);
+    if(!st) st = rrdset_find_byname(host, chart);
+    if(!st) {
+        buffer_no_cacheable(w->response.data);
+        buffer_svg(w->response.data, "chart not found", NAN, "", NULL, NULL, -1, scale, 0);
+        ret = 200;
+        goto cleanup;
+    }
+    st->last_accessed_time = now_realtime_sec();
+
+    RRDCALC *rc = NULL;
+    if(alarm) {
+        rc = rrdcalc_find(st, alarm);
+        if (!rc) {
+            buffer_no_cacheable(w->response.data);
+            buffer_svg(w->response.data, "alarm not found", NAN, "", NULL, NULL, -1, scale, 0);
+            ret = 200;
+            goto cleanup;
+        }
+    }
+
+    long long multiply  = (multiply_str  && *multiply_str )?str2l(multiply_str):1;
+    long long divide    = (divide_str    && *divide_str   )?str2l(divide_str):1;
+    long long before    = (before_str    && *before_str   )?str2l(before_str):0;
+    long long after     = (after_str     && *after_str    )?str2l(after_str):-st->update_every;
+    int       points    = (points_str    && *points_str   )?str2i(points_str):1;
+    int       precision = (precision_str && *precision_str)?str2i(precision_str):-1;
+
+    if(!multiply) multiply = 1;
+    if(!divide) divide = 1;
+
+    int refresh = 0;
+    if(refresh_str && *refresh_str) {
+        if(!strcmp(refresh_str, "auto")) {
+            if(rc) refresh = rc->update_every;
+            else if(options & RRDR_OPTION_NOT_ALIGNED)
+                refresh = st->update_every;
+            else {
+                refresh = (int)(before - after);
+                if(refresh < 0) refresh = -refresh;
+            }
+        }
+        else {
+            refresh = str2i(refresh_str);
+            if(refresh < 0) refresh = -refresh;
+        }
+    }
+
+    if(!label) {
+        if(alarm) {
+            char *s = (char *)alarm;
+            while(*s) {
+                if(*s == '_') *s = ' ';
+                s++;
+            }
+            label = alarm;
+        }
+        else if(dimensions) {
+            const char *dim = buffer_tostring(dimensions);
+            if(*dim == '|') dim++;
+            label = dim;
+        }
+        else
+            label = st->name;
+    }
+    if(!units) {
+        if(alarm) {
+            if(rc->units)
+                units = rc->units;
+            else
+                units = "";
+        }
+        else if(options & RRDR_OPTION_PERCENTAGE)
+            units = "%";
+        else
+            units = st->units;
+    }
+
+    debug(D_WEB_CLIENT, "%llu: API command 'badge.svg' for chart '%s', alarm '%s', dimensions '%s', after '%lld', before '%lld', points '%d', group '%d', options '0x%08x'"
+          , w->id
+          , chart
+          , alarm?alarm:""
+          , (dimensions)?buffer_tostring(dimensions):""
+          , after
+          , before
+          , points
+          , group
+          , options
+    );
+
+    if(rc) {
+        if (refresh > 0) {
+            buffer_sprintf(w->response.header, "Refresh: %d\r\n", refresh);
+            w->response.data->expires = now_realtime_sec() + refresh;
+        }
+        else buffer_no_cacheable(w->response.data);
+
+        if(!value_color) {
+            switch(rc->status) {
+                case RRDCALC_STATUS_CRITICAL:
+                    value_color = "red";
+                    break;
+
+                case RRDCALC_STATUS_WARNING:
+                    value_color = "orange";
+                    break;
+
+                case RRDCALC_STATUS_CLEAR:
+                    value_color = "brightgreen";
+                    break;
+
+                case RRDCALC_STATUS_UNDEFINED:
+                    value_color = "lightgrey";
+                    break;
+
+                case RRDCALC_STATUS_UNINITIALIZED:
+                    value_color = "#000";
+                    break;
+
+                default:
+                    value_color = "grey";
+                    break;
+            }
+        }
+
+        buffer_svg(w->response.data,
+                label,
+                (isnan(rc->value)||isinf(rc->value)) ? rc->value : rc->value * multiply / divide,
+                units,
+                label_color,
+                value_color,
+                precision,
+                scale,
+                options
+        );
+        ret = 200;
+    }
+    else {
+        time_t latest_timestamp = 0;
+        int value_is_null = 1;
+        calculated_number n = NAN;
+        ret = 500;
+
+        // if the collected value is too old, don't calculate its value
+        if (rrdset_last_entry_t(st) >= (now_realtime_sec() - (st->update_every * st->gap_when_lost_iterations_above)))
+            ret = rrdset2value_api_v1(st, w->response.data, &n, (dimensions) ? buffer_tostring(dimensions) : NULL
+                                      , points, after, before, group, 0, options, NULL, &latest_timestamp, &value_is_null);
+
+        // if the value cannot be calculated, show empty badge
+        if (ret != 200) {
+            buffer_no_cacheable(w->response.data);
+            value_is_null = 1;
+            n = 0;
+            ret = 200;
+        }
+        else if (refresh > 0) {
+            buffer_sprintf(w->response.header, "Refresh: %d\r\n", refresh);
+            w->response.data->expires = now_realtime_sec() + refresh;
+        }
+        else buffer_no_cacheable(w->response.data);
+
+        // render the badge
+        buffer_svg(w->response.data,
+                label,
+                (value_is_null)?NAN:(n * multiply / divide),
+                units,
+                label_color,
+                value_color,
+                precision,
+                scale,
+                options
+        );
+    }
+
+    cleanup:
+    buffer_free(dimensions);
+    return ret;
+}
diff --git a/src/web_buffer_svg.h b/web/api/badges/web_buffer_svg.h
index c23abf0dc..f75677bf9 100644
--- a/src/web_buffer_svg.h
+++ b/web/api/badges/web_buffer_svg.h
@@ -1,7 +1,16 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 #ifndef NETDATA_WEB_BUFFER_SVG_H
 #define NETDATA_WEB_BUFFER_SVG_H 1
 
+#include "libnetdata/libnetdata.h"
+#include "web/server/web_client.h"
+
 extern void buffer_svg(BUFFER *wb, const char *label, calculated_number value, const char *units, const char *label_color, const char *value_color, int precision, int scale, uint32_t options);
 extern char *format_value_and_unit(char *value_string, size_t value_string_len, calculated_number value, const char *units, int precision);
 
+extern int web_client_api_request_v1_badge(struct rrdhost *host, struct web_client *w, char *url);
+
+#include "web/api/web_api_v1.h"
+
 #endif /* NETDATA_WEB_BUFFER_SVG_H */
diff --git a/web/api/exporters/Makefile.am b/web/api/exporters/Makefile.am
new file mode 100644
index 000000000..3dce98aa9
--- /dev/null
+++ b/web/api/exporters/Makefile.am
@@ -0,0 +1,13 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+AUTOMAKE_OPTIONS = subdir-objects
+MAINTAINERCLEANFILES = $(srcdir)/Makefile.in
+
+SUBDIRS = \
+    shell \
+    prometheus \
+    $(NULL)
+
+dist_noinst_DATA = \
+	README.md \
+	$(NULL)
diff --git a/web/api/exporters/Makefile.in b/web/api/exporters/Makefile.in
new file mode 100644
index 000000000..50e4a6cda
--- /dev/null
+++ b/web/api/exporters/Makefile.in
@@ -0,0 +1,649 @@
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+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
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+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
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+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
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+	  if test "$$subdir" = .; then :; else \
+	    $(am__make_dryrun) \
+	      || test -d "$(distdir)/$$subdir" \
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+	    echo "     am__remove_distdir=: am__skip_length_check=: am__skip_mode_fix=: distdir)"; \
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+	      install; \
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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
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diff --git a/web/api/exporters/README.md b/web/api/exporters/README.md
new file mode 100644
index 000000000..e69de29bb
--- /dev/null
+++ b/web/api/exporters/README.md
diff --git a/web/api/exporters/allmetrics.c b/web/api/exporters/allmetrics.c
new file mode 100644
index 000000000..a426db0cc
--- /dev/null
+++ b/web/api/exporters/allmetrics.c
@@ -0,0 +1,113 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "allmetrics.h"
+
+struct prometheus_output_options {
+    char *name;
+    PROMETHEUS_OUTPUT_OPTIONS flag;
+} prometheus_output_flags_root[] = {
+        { "help",       PROMETHEUS_OUTPUT_HELP       },
+        { "types",      PROMETHEUS_OUTPUT_TYPES      },
+        { "names",      PROMETHEUS_OUTPUT_NAMES      },
+        { "timestamps", PROMETHEUS_OUTPUT_TIMESTAMPS },
+        { "variables",  PROMETHEUS_OUTPUT_VARIABLES  },
+
+        // terminator
+        { NULL, PROMETHEUS_OUTPUT_NONE },
+};
+
+inline int web_client_api_request_v1_allmetrics(RRDHOST *host, struct web_client *w, char *url) {
+    int format = ALLMETRICS_SHELL;
+    const char *prometheus_server = w->client_ip;
+    uint32_t prometheus_backend_options = global_backend_options;
+    PROMETHEUS_OUTPUT_OPTIONS prometheus_output_options = PROMETHEUS_OUTPUT_TIMESTAMPS | ((global_backend_options & BACKEND_OPTION_SEND_NAMES)?PROMETHEUS_OUTPUT_NAMES:0);
+    const char *prometheus_prefix = global_backend_prefix;
+
+    while(url) {
+        char *value = mystrsep(&url, "?&");
+        if (!value || !*value) continue;
+
+        char *name = mystrsep(&value, "=");
+        if(!name || !*name) continue;
+        if(!value || !*value) continue;
+
+        if(!strcmp(name, "format")) {
+            if(!strcmp(value, ALLMETRICS_FORMAT_SHELL))
+                format = ALLMETRICS_SHELL;
+            else if(!strcmp(value, ALLMETRICS_FORMAT_PROMETHEUS))
+                format = ALLMETRICS_PROMETHEUS;
+            else if(!strcmp(value, ALLMETRICS_FORMAT_PROMETHEUS_ALL_HOSTS))
+                format = ALLMETRICS_PROMETHEUS_ALL_HOSTS;
+            else if(!strcmp(value, ALLMETRICS_FORMAT_JSON))
+                format = ALLMETRICS_JSON;
+            else
+                format = 0;
+        }
+        else if(!strcmp(name, "server")) {
+            prometheus_server = value;
+        }
+        else if(!strcmp(name, "prefix")) {
+            prometheus_prefix = value;
+        }
+        else if(!strcmp(name, "data") || !strcmp(name, "source") || !strcmp(name, "data source") || !strcmp(name, "data-source") || !strcmp(name, "data_source") || !strcmp(name, "datasource")) {
+            prometheus_backend_options = backend_parse_data_source(value, prometheus_backend_options);
+        }
+        else {
+            int i;
+            for(i = 0; prometheus_output_flags_root[i].name ; i++) {
+                if(!strcmp(name, prometheus_output_flags_root[i].name)) {
+                    if(!strcmp(value, "yes") || !strcmp(value, "1") || !strcmp(value, "true"))
+                        prometheus_output_options |= prometheus_output_flags_root[i].flag;
+                    else
+                        prometheus_output_options &= ~prometheus_output_flags_root[i].flag;
+
+                    break;
+                }
+            }
+        }
+    }
+
+    buffer_flush(w->response.data);
+    buffer_no_cacheable(w->response.data);
+
+    switch(format) {
+        case ALLMETRICS_JSON:
+            w->response.data->contenttype = CT_APPLICATION_JSON;
+            rrd_stats_api_v1_charts_allmetrics_json(host, w->response.data);
+            return 200;
+
+        case ALLMETRICS_SHELL:
+            w->response.data->contenttype = CT_TEXT_PLAIN;
+            rrd_stats_api_v1_charts_allmetrics_shell(host, w->response.data);
+            return 200;
+
+        case ALLMETRICS_PROMETHEUS:
+            w->response.data->contenttype = CT_PROMETHEUS;
+            rrd_stats_api_v1_charts_allmetrics_prometheus_single_host(
+                    host
+                    , w->response.data
+                    , prometheus_server
+                    , prometheus_prefix
+                    , prometheus_backend_options
+                    , prometheus_output_options
+            );
+            return 200;
+
+        case ALLMETRICS_PROMETHEUS_ALL_HOSTS:
+            w->response.data->contenttype = CT_PROMETHEUS;
+            rrd_stats_api_v1_charts_allmetrics_prometheus_all_hosts(
+                    host
+                    , w->response.data
+                    , prometheus_server
+                    , prometheus_prefix
+                    , prometheus_backend_options
+                    , prometheus_output_options
+            );
+            return 200;
+
+        default:
+            w->response.data->contenttype = CT_TEXT_PLAIN;
+            buffer_strcat(w->response.data, "Which format? '" ALLMETRICS_FORMAT_SHELL "', '" ALLMETRICS_FORMAT_PROMETHEUS "', '" ALLMETRICS_FORMAT_PROMETHEUS_ALL_HOSTS "' and '" ALLMETRICS_FORMAT_JSON "' are currently supported.");
+            return 400;
+    }
+}
diff --git a/web/api/exporters/allmetrics.h b/web/api/exporters/allmetrics.h
new file mode 100644
index 000000000..e8dedabf4
--- /dev/null
+++ b/web/api/exporters/allmetrics.h
@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_API_ALLMETRICS_H
+#define NETDATA_API_ALLMETRICS_H
+
+#include "web/api/formatters/rrd2json.h"
+#include "shell/allmetrics_shell.h"
+
+extern int web_client_api_request_v1_allmetrics(RRDHOST *host, struct web_client *w, char *url);
+
+#endif //NETDATA_API_ALLMETRICS_H
diff --git a/web/api/exporters/prometheus/Makefile.am b/web/api/exporters/prometheus/Makefile.am
new file mode 100644
index 000000000..19554bed8
--- /dev/null
+++ b/web/api/exporters/prometheus/Makefile.am
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+AUTOMAKE_OPTIONS = subdir-objects
+MAINTAINERCLEANFILES = $(srcdir)/Makefile.in
+
+dist_noinst_DATA = \
+	README.md \
+	$(NULL)
diff --git a/web/api/exporters/prometheus/Makefile.in b/web/api/exporters/prometheus/Makefile.in
new file mode 100644
index 000000000..202f19b3d
--- /dev/null
+++ b/web/api/exporters/prometheus/Makefile.in
@@ -0,0 +1,464 @@
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+# with or without modifications, as long as this notice is preserved.
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diff --git a/web/api/exporters/prometheus/README.md b/web/api/exporters/prometheus/README.md
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index 000000000..437f90c53
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+++ b/web/api/exporters/prometheus/README.md
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+# prometheus exporter
+
+The prometheus exporter for netdata is located at the [backends section for prometheus](../../../../backends/prometheus).
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+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: check-am
+all-am: Makefile $(DATA)
+installdirs:
+install: install-am
+install-exec: install-exec-am
+install-data: install-data-am
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+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
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+installcheck: installcheck-am
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+	-test -z "$(MAINTAINERCLEANFILES)" || rm -f $(MAINTAINERCLEANFILES)
+clean: clean-am
+
+clean-am: clean-generic mostlyclean-am
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+distclean: distclean-am
+	-rm -f Makefile
+distclean-am: clean-am distclean-generic
+
+dvi: dvi-am
+
+dvi-am:
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+html: html-am
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+html-am:
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+info: info-am
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+	-rm -f Makefile
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+	ctags-am distclean distclean-generic distdir dvi dvi-am html \
+	html-am info info-am install install-am install-data \
+	install-data-am install-dvi install-dvi-am install-exec \
+	install-exec-am install-html install-html-am install-info \
+	install-info-am install-man install-pdf install-pdf-am \
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+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
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diff --git a/web/api/exporters/shell/README.md b/web/api/exporters/shell/README.md
new file mode 100644
index 000000000..065afff5c
--- /dev/null
+++ b/web/api/exporters/shell/README.md
@@ -0,0 +1,64 @@
+# shell exporter
+
+Shell scripts can now query netdata:
+
+```sh
+eval "$(curl -s 'http://localhost:19999/api/v1/allmetrics')"
+```
+
+after this command, all the netdata metrics are exposed to shell. Check:
+
+```sh
+# source the metrics
+eval "$(curl -s 'http://localhost:19999/api/v1/allmetrics')"
+
+# let's see if there are variables exposed by netdata for system.cpu
+set | grep "^NETDATA_SYSTEM_CPU"
+
+NETDATA_SYSTEM_CPU_GUEST=0
+NETDATA_SYSTEM_CPU_GUEST_NICE=0
+NETDATA_SYSTEM_CPU_IDLE=95
+NETDATA_SYSTEM_CPU_IOWAIT=0
+NETDATA_SYSTEM_CPU_IRQ=0
+NETDATA_SYSTEM_CPU_NICE=0
+NETDATA_SYSTEM_CPU_SOFTIRQ=0
+NETDATA_SYSTEM_CPU_STEAL=0
+NETDATA_SYSTEM_CPU_SYSTEM=1
+NETDATA_SYSTEM_CPU_USER=4
+NETDATA_SYSTEM_CPU_VISIBLETOTAL=5
+
+# let's see the total cpu utilization of the system
+echo ${NETDATA_SYSTEM_CPU_VISIBLETOTAL}
+5
+
+# what about alarms?
+set | grep "^NETDATA_ALARM_SYSTEM_SWAP_"
+NETDATA_ALARM_SYSTEM_SWAP_RAM_IN_SWAP_STATUS=CRITICAL
+NETDATA_ALARM_SYSTEM_SWAP_RAM_IN_SWAP_VALUE=53
+NETDATA_ALARM_SYSTEM_SWAP_USED_SWAP_STATUS=CLEAR
+NETDATA_ALARM_SYSTEM_SWAP_USED_SWAP_VALUE=51
+
+# let's get the current status of the alarm 'ram in swap'
+echo ${NETDATA_ALARM_SYSTEM_SWAP_RAM_IN_SWAP_STATUS}
+CRITICAL
+
+# is it fast?
+time curl -s 'http://localhost:19999/api/v1/allmetrics' >/dev/null
+
+real  0m0,070s
+user  0m0,000s
+sys   0m0,007s
+
+# it is...
+# 0.07 seconds for curl to be loaded, connect to netdata and fetch the response back...
+```
+
+The `_VISIBLETOTAL` variable sums up all the dimensions of each chart.
+
+The format of the variables is:
+
+```sh
+NETDATA_${chart_id^^}_${dimension_id^^}="${value}"
+```
+
+The value is rounded to the closest integer, since shell script cannot process decimal numbers.
diff --git a/web/api/exporters/shell/allmetrics_shell.c b/web/api/exporters/shell/allmetrics_shell.c
new file mode 100644
index 000000000..e380deec4
--- /dev/null
+++ b/web/api/exporters/shell/allmetrics_shell.c
@@ -0,0 +1,159 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "allmetrics_shell.h"
+
+// ----------------------------------------------------------------------------
+// BASH
+// /api/v1/allmetrics?format=bash
+
+static inline size_t shell_name_copy(char *d, const char *s, size_t usable) {
+    size_t n;
+
+    for(n = 0; *s && n < usable ; d++, s++, n++) {
+        register char c = *s;
+
+        if(unlikely(!isalnum(c))) *d = '_';
+        else *d = (char)toupper(c);
+    }
+    *d = '\0';
+
+    return n;
+}
+
+#define SHELL_ELEMENT_MAX 100
+
+void rrd_stats_api_v1_charts_allmetrics_shell(RRDHOST *host, BUFFER *wb) {
+    rrdhost_rdlock(host);
+
+    // for each chart
+    RRDSET *st;
+    rrdset_foreach_read(st, host) {
+        calculated_number total = 0.0;
+        char chart[SHELL_ELEMENT_MAX + 1];
+        shell_name_copy(chart, st->name?st->name:st->id, SHELL_ELEMENT_MAX);
+
+        buffer_sprintf(wb, "\n# chart: %s (name: %s)\n", st->id, st->name);
+        if(rrdset_is_available_for_viewers(st)) {
+            rrdset_rdlock(st);
+
+            // for each dimension
+            RRDDIM *rd;
+            rrddim_foreach_read(rd, st) {
+                if(rd->collections_counter) {
+                    char dimension[SHELL_ELEMENT_MAX + 1];
+                    shell_name_copy(dimension, rd->name?rd->name:rd->id, SHELL_ELEMENT_MAX);
+
+                    calculated_number n = rd->last_stored_value;
+
+                    if(isnan(n) || isinf(n))
+                        buffer_sprintf(wb, "NETDATA_%s_%s=\"\"      # %s\n", chart, dimension, st->units);
+                    else {
+                        if(rd->multiplier < 0 || rd->divisor < 0) n = -n;
+                        n = calculated_number_round(n);
+                        if(!rrddim_flag_check(rd, RRDDIM_FLAG_HIDDEN)) total += n;
+                        buffer_sprintf(wb, "NETDATA_%s_%s=\"" CALCULATED_NUMBER_FORMAT_ZERO "\"      # %s\n", chart, dimension, n, st->units);
+                    }
+                }
+            }
+
+            total = calculated_number_round(total);
+            buffer_sprintf(wb, "NETDATA_%s_VISIBLETOTAL=\"" CALCULATED_NUMBER_FORMAT_ZERO "\"      # %s\n", chart, total, st->units);
+            rrdset_unlock(st);
+        }
+    }
+
+    buffer_strcat(wb, "\n# NETDATA ALARMS RUNNING\n");
+
+    RRDCALC *rc;
+    for(rc = host->alarms; rc ;rc = rc->next) {
+        if(!rc->rrdset) continue;
+
+        char chart[SHELL_ELEMENT_MAX + 1];
+        shell_name_copy(chart, rc->rrdset->name?rc->rrdset->name:rc->rrdset->id, SHELL_ELEMENT_MAX);
+
+        char alarm[SHELL_ELEMENT_MAX + 1];
+        shell_name_copy(alarm, rc->name, SHELL_ELEMENT_MAX);
+
+        calculated_number n = rc->value;
+
+        if(isnan(n) || isinf(n))
+            buffer_sprintf(wb, "NETDATA_ALARM_%s_%s_VALUE=\"\"      # %s\n", chart, alarm, rc->units);
+        else {
+            n = calculated_number_round(n);
+            buffer_sprintf(wb, "NETDATA_ALARM_%s_%s_VALUE=\"" CALCULATED_NUMBER_FORMAT_ZERO "\"      # %s\n", chart, alarm, n, rc->units);
+        }
+
+        buffer_sprintf(wb, "NETDATA_ALARM_%s_%s_STATUS=\"%s\"\n", chart, alarm, rrdcalc_status2string(rc->status));
+    }
+
+    rrdhost_unlock(host);
+}
+
+// ----------------------------------------------------------------------------
+
+void rrd_stats_api_v1_charts_allmetrics_json(RRDHOST *host, BUFFER *wb) {
+    rrdhost_rdlock(host);
+
+    buffer_strcat(wb, "{");
+
+    size_t chart_counter = 0;
+    size_t dimension_counter = 0;
+
+    // for each chart
+    RRDSET *st;
+    rrdset_foreach_read(st, host) {
+        if(rrdset_is_available_for_viewers(st)) {
+            rrdset_rdlock(st);
+
+            buffer_sprintf(wb, "%s\n"
+                               "\t\"%s\": {\n"
+                               "\t\t\"name\":\"%s\",\n"
+                               "\t\t\"context\":\"%s\",\n"
+                               "\t\t\"units\":\"%s\",\n"
+                               "\t\t\"last_updated\": %ld,\n"
+                               "\t\t\"dimensions\": {"
+                           , chart_counter?",":""
+                           , st->id
+                           , st->name
+                           , st->context
+                           , st->units
+                           , rrdset_last_entry_t(st)
+            );
+
+            chart_counter++;
+            dimension_counter = 0;
+
+            // for each dimension
+            RRDDIM *rd;
+            rrddim_foreach_read(rd, st) {
+                if(rd->collections_counter) {
+
+                    buffer_sprintf(wb, "%s\n"
+                                       "\t\t\t\"%s\": {\n"
+                                       "\t\t\t\t\"name\": \"%s\",\n"
+                                       "\t\t\t\t\"value\": "
+                                   , dimension_counter?",":""
+                                   , rd->id
+                                   , rd->name
+                    );
+
+                    if(isnan(rd->last_stored_value))
+                        buffer_strcat(wb, "null");
+                    else
+                        buffer_sprintf(wb, CALCULATED_NUMBER_FORMAT, rd->last_stored_value);
+
+                    buffer_strcat(wb, "\n\t\t\t}");
+
+                    dimension_counter++;
+                }
+            }
+
+            buffer_strcat(wb, "\n\t\t}\n\t}");
+            rrdset_unlock(st);
+        }
+    }
+
+    buffer_strcat(wb, "\n}");
+    rrdhost_unlock(host);
+}
+
diff --git a/web/api/exporters/shell/allmetrics_shell.h b/web/api/exporters/shell/allmetrics_shell.h
new file mode 100644
index 000000000..1d7611a2d
--- /dev/null
+++ b/web/api/exporters/shell/allmetrics_shell.h
@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_API_ALLMETRICS_SHELL_H
+#define NETDATA_API_ALLMETRICS_SHELL_H
+
+#include "../allmetrics.h"
+
+#define ALLMETRICS_FORMAT_SHELL                 "shell"
+#define ALLMETRICS_FORMAT_PROMETHEUS            "prometheus"
+#define ALLMETRICS_FORMAT_PROMETHEUS_ALL_HOSTS  "prometheus_all_hosts"
+#define ALLMETRICS_FORMAT_JSON                  "json"
+
+#define ALLMETRICS_SHELL                        1
+#define ALLMETRICS_PROMETHEUS                   2
+#define ALLMETRICS_JSON                         3
+#define ALLMETRICS_PROMETHEUS_ALL_HOSTS         4
+
+extern void rrd_stats_api_v1_charts_allmetrics_json(RRDHOST *host, BUFFER *wb);
+extern void rrd_stats_api_v1_charts_allmetrics_shell(RRDHOST *host, BUFFER *wb);
+
+#endif //NETDATA_API_ALLMETRICS_SHELL_H
diff --git a/web/api/formatters/Makefile.am b/web/api/formatters/Makefile.am
new file mode 100644
index 000000000..324575906
--- /dev/null
+++ b/web/api/formatters/Makefile.am
@@ -0,0 +1,15 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+AUTOMAKE_OPTIONS = subdir-objects
+MAINTAINERCLEANFILES = $(srcdir)/Makefile.in
+
+SUBDIRS = \
+    csv \
+    json \
+    ssv \
+    value \
+    $(NULL)
+
+dist_noinst_DATA = \
+	README.md \
+	$(NULL)
diff --git a/web/api/formatters/Makefile.in b/web/api/formatters/Makefile.in
new file mode 100644
index 000000000..a2ea0e53c
--- /dev/null
+++ b/web/api/formatters/Makefile.in
@@ -0,0 +1,651 @@
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diff --git a/web/api/formatters/README.md b/web/api/formatters/README.md
new file mode 100644
index 000000000..ad0df2d46
--- /dev/null
+++ b/web/api/formatters/README.md
@@ -0,0 +1,72 @@
+# Query formatting
+
+API data queries need to be formatted before returned to the caller.
+Using API parameters, the caller may define the format he/she wishes to get back.
+
+The following formats are supported:
+
+format|module|content type|description
+:---:|:---:|:---:|:-----
+`array`|[ssv](ssv)|application/json|a JSON array
+`csv`|[csv](csv)|text/plain|a text table, comma separated, with a header line (dimension names) and `\r\n` at the end of the lines
+`csvjsonarray`|[csv](csv)|application/json|a JSON array, with each row as another array (the first row has the dimension names)
+`datasource`|[json](json)|application/json|a Google Visualization Provider `datasource` javascript callback
+`datatable`|[json](json)|application/json|a Google `datatable`
+`html`|[csv](csv)|text/html|an html table
+`json`|[json](json)|application/json|a JSON object
+`jsonp`|[json](json)|application/json|a JSONP javascript callback
+`markdown`|[csv](csv)|text/plain|a markdown table
+`ssv`|[ssv](ssv)|text/plain|a space separated list of values
+`ssvcomma`|[ssv](ssv)|text/plain|a comma separated list of values
+`tsv`|[csv](csv)|text/plain|a TAB delimited `csv` (MS Excel flavor)
+
+For examples of each format, check the relative module documentation.
+
+## Metadata with the `jsonwrap` option
+
+All data queries can be encapsulated to JSON object having metadata about the query and the results.
+
+This is done by adding the `options=jsonwrap` to the API URL (if there are other `options` append
+`,jsonwrap` to the existing ones).
+
+This is such an object:
+
+```bash
+# curl -Ss 'https://registry.my-netdata.io/api/v1/data?chart=system.cpu&after=-3600&points=6&group=average&format=csv&options=nonzero,jsonwrap'
+{
+   "api": 1,
+   "id": "system.cpu",
+   "name": "system.cpu",
+   "view_update_every": 600,
+   "update_every": 1,
+   "first_entry": 1540387074,
+   "last_entry": 1540647070,
+   "before": 1540647000,
+   "after": 1540644000,
+   "dimension_names": ["steal", "softirq", "user", "system", "iowait"],
+   "dimension_ids": ["steal", "softirq", "user", "system", "iowait"],
+   "latest_values": [0, 0.2493766, 1.745636, 0.4987531, 0],
+   "view_latest_values": [0.0158314, 0.0516506, 0.866549, 0.7196127, 0.0050002],
+   "dimensions": 5,
+   "points": 6,
+   "format": "csv",
+   "result": "time,steal,softirq,user,system,iowait\n2018-10-27 13:30:00,0.0158314,0.0516506,0.866549,0.7196127,0.0050002\n2018-10-27 13:20:00,0.0149856,0.0529183,0.8673155,0.7121144,0.0049979\n2018-10-27 13:10:00,0.0137501,0.053315,0.8578097,0.7197613,0.0054209\n2018-10-27 13:00:00,0.0154252,0.0554688,0.899432,0.7200638,0.0067252\n2018-10-27 12:50:00,0.0145866,0.0495922,0.8404341,0.7011141,0.0041688\n2018-10-27 12:40:00,0.0162366,0.0595954,0.8827475,0.7020573,0.0041636\n",
+ "min": 0,
+ "max": 0
+}
+```
+
+## Downloading data query result files
+
+Following the [Google Visualization Provider guidelines](https://developers.google.com/chart/interactive/docs/dev/implementing_data_source),
+netdata supports parsing `tqx` options.
+
+Using these options, any netdata data query can instruct the web browser to download
+the result and save it under a given filename.
+
+For example, to download a CSV file with CPU utilization of the last hour,
+[click here](https://registry.my-netdata.io/api/v1/data?chart=system.cpu&after=-3600&format=csv&options=nonzero&tqx=outFileName:system+cpu+utilization+of+the+last_hour.csv).
+
+
+This is done by appending `&tqx=outFileName:FILENAME` to any data query.
+The output will be in the format given with `&format=`.
diff --git a/web/api/formatters/charts2json.c b/web/api/formatters/charts2json.c
new file mode 100644
index 000000000..f60f7f540
--- /dev/null
+++ b/web/api/formatters/charts2json.c
@@ -0,0 +1,103 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "charts2json.h"
+
+// generate JSON for the /api/v1/charts API call
+
+void charts2json(RRDHOST *host, BUFFER *wb) {
+    static char *custom_dashboard_info_js_filename = NULL;
+    size_t c, dimensions = 0, memory = 0, alarms = 0;
+    RRDSET *st;
+
+    time_t now = now_realtime_sec();
+
+    if(unlikely(!custom_dashboard_info_js_filename))
+        custom_dashboard_info_js_filename = config_get(CONFIG_SECTION_WEB, "custom dashboard_info.js", "");
+
+    buffer_sprintf(wb, "{\n"
+                       "\t\"hostname\": \"%s\""
+                       ",\n\t\"version\": \"%s\""
+                       ",\n\t\"os\": \"%s\""
+                       ",\n\t\"timezone\": \"%s\""
+                       ",\n\t\"update_every\": %d"
+                       ",\n\t\"history\": %ld"
+                       ",\n\t\"custom_info\": \"%s\""
+                       ",\n\t\"charts\": {"
+                   , host->hostname
+                   , host->program_version
+                   , host->os
+                   , host->timezone
+                   , host->rrd_update_every
+                   , host->rrd_history_entries
+                   , custom_dashboard_info_js_filename
+    );
+
+    c = 0;
+    rrdhost_rdlock(host);
+    rrdset_foreach_read(st, host) {
+        if(rrdset_is_available_for_viewers(st)) {
+            if(c) buffer_strcat(wb, ",");
+            buffer_strcat(wb, "\n\t\t\"");
+            buffer_strcat(wb, st->id);
+            buffer_strcat(wb, "\": ");
+            rrdset2json(st, wb, &dimensions, &memory);
+
+            c++;
+            st->last_accessed_time = now;
+        }
+    }
+
+    RRDCALC *rc;
+    for(rc = host->alarms; rc ; rc = rc->next) {
+        if(rc->rrdset)
+            alarms++;
+    }
+    rrdhost_unlock(host);
+
+    buffer_sprintf(wb
+                   , "\n\t}"
+                     ",\n\t\"charts_count\": %zu"
+                     ",\n\t\"dimensions_count\": %zu"
+                     ",\n\t\"alarms_count\": %zu"
+                     ",\n\t\"rrd_memory_bytes\": %zu"
+                     ",\n\t\"hosts_count\": %zu"
+                     ",\n\t\"hosts\": ["
+                   , c
+                   , dimensions
+                   , alarms
+                   , memory
+                   , rrd_hosts_available
+    );
+
+    if(unlikely(rrd_hosts_available > 1)) {
+        rrd_rdlock();
+
+        size_t found = 0;
+        RRDHOST *h;
+        rrdhost_foreach_read(h) {
+            if(!rrdhost_should_be_removed(h, host, now)) {
+                buffer_sprintf(wb
+                               , "%s\n\t\t{"
+                                 "\n\t\t\t\"hostname\": \"%s\""
+                                 "\n\t\t}"
+                               , (found > 0) ? "," : ""
+                               , h->hostname
+                );
+
+                found++;
+            }
+        }
+
+        rrd_unlock();
+    }
+    else {
+        buffer_sprintf(wb
+                       , "\n\t\t{"
+                         "\n\t\t\t\"hostname\": \"%s\""
+                         "\n\t\t}"
+                       , host->hostname
+        );
+    }
+
+    buffer_sprintf(wb, "\n\t]\n}\n");
+}
diff --git a/web/api/formatters/charts2json.h b/web/api/formatters/charts2json.h
new file mode 100644
index 000000000..5d6d80060
--- /dev/null
+++ b/web/api/formatters/charts2json.h
@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_API_FORMATTER_CHARTS2JSON_H
+#define NETDATA_API_FORMATTER_CHARTS2JSON_H
+
+#include "rrd2json.h"
+
+extern void charts2json(RRDHOST *host, BUFFER *wb);
+
+#endif //NETDATA_API_FORMATTER_CHARTS2JSON_H
diff --git a/web/api/formatters/csv/Makefile.am b/web/api/formatters/csv/Makefile.am
new file mode 100644
index 000000000..19554bed8
--- /dev/null
+++ b/web/api/formatters/csv/Makefile.am
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+AUTOMAKE_OPTIONS = subdir-objects
+MAINTAINERCLEANFILES = $(srcdir)/Makefile.in
+
+dist_noinst_DATA = \
+	README.md \
+	$(NULL)
diff --git a/web/api/formatters/csv/Makefile.in b/web/api/formatters/csv/Makefile.in
new file mode 100644
index 000000000..9ba808443
--- /dev/null
+++ b/web/api/formatters/csv/Makefile.in
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+
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+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-generic
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: install-am install-strip
+
+.PHONY: all all-am check check-am clean clean-generic cscopelist-am \
+	ctags-am distclean distclean-generic distdir dvi dvi-am html \
+	html-am info info-am install install-am install-data \
+	install-data-am install-dvi install-dvi-am install-exec \
+	install-exec-am install-html install-html-am install-info \
+	install-info-am install-man install-pdf install-pdf-am \
+	install-ps install-ps-am install-strip installcheck \
+	installcheck-am installdirs maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-generic pdf \
+	pdf-am ps ps-am tags-am uninstall uninstall-am
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/web/api/formatters/csv/README.md b/web/api/formatters/csv/README.md
new file mode 100644
index 000000000..4711dcbd1
--- /dev/null
+++ b/web/api/formatters/csv/README.md
@@ -0,0 +1,139 @@
+# CSV formatter
+
+The CSV formatter presents [results of database queries](../../queries) in the following formats:
+
+format|content type|description
+:---:|:---:|:-----
+`csv`|text/plain|a text table, comma separated, with a header line (dimension names) and `\r\n` at the end of the lines
+`csvjsonarray`|application/json|a JSON array, with each row as another array (the first row has the dimension names)
+`tsv`|text/plain|like `csv` but TAB is used instead of comma to separate values (MS Excel flavor)
+`html`|text/html|an html table
+`markdown`|text/plain|markdown table
+
+In all formats the date and time is the first column.
+
+The CSV formatter respects the following API `&options=`:
+
+option|supported|description
+:---:|:---:|:---
+`nonzero`|yes|to return only the dimensions that have at least a non-zero value
+`flip`|yes|to return the rows older to newer (the default is newer to older)
+`seconds`|yes|to return the date and time in unix timestamp
+`ms`|yes|to return the date and time in unit timestamp as milliseconds
+`percent`|yes|to replace all values with their percentage over the row total
+`abs`|yes|to turn all values positive
+`null2zero`|yes|to replace gaps with zeros (the default prints the string `null`
+
+
+## Examples
+
+Get the system total bandwidth for all physical network interfaces, over the last hour,
+in 6 rows (one for every 10 minutes), in `csv` format:
+
+Netdata always returns bandwidth in `kilobits`.
+
+```bash
+# curl -Ss 'https://registry.my-netdata.io/api/v1/data?chart=system.net&format=csv&after=-3600&group=sum&points=6&options=abs'
+time,received,sent
+2018-10-26 23:50:00,90214.67847,215137.79762
+2018-10-26 23:40:00,90126.32286,238587.57522
+2018-10-26 23:30:00,86061.22688,213389.23526
+2018-10-26 23:20:00,85590.75164,206129.01608
+2018-10-26 23:10:00,83163.30691,194311.77384
+2018-10-26 23:00:00,85167.29657,197538.07773
+```
+
+---
+
+Get the max RAM used by the SQL server and any cron jobs, over the last hour, in 2 rows (one for every 30
+minutes), in `tsv` format, and format the date and time as unix timestamp:
+
+Netdata always returns memory in `MB`.
+
+```bash
+# curl -Ss 'https://registry.my-netdata.io/api/v1/data?chart=apps.mem&format=tsv&after=-3600&group=max&points=2&options=nonzero,seconds&dimensions=sql,cron'
+time	sql	cron
+1540598400	61.95703	0.25
+1540596600	61.95703	0.25
+```
+
+---
+
+Get an HTML table of the last 4 values (4 seconds) of system CPU utilization:
+
+Netdata always returns CPU utilization as `%`.
+
+```bash
+# curl -Ss 'https://registry.my-netdata.io/api/v1/data?chart=system.cpu&format=html&after=-4&options=nonzero'
+<html>
+<center>
+<table border="0" cellpadding="5" cellspacing="5">
+<tr><td>time</td><td>softirq</td><td>user</td><td>system</td></tr>
+<tr><td>2018-10-27 00:16:07</td><td>0.25</td><td>1</td><td>0.75</td></tr>
+<tr><td>2018-10-27 00:16:06</td><td>0</td><td>1.0025063</td><td>0.5012531</td></tr>
+<tr><td>2018-10-27 00:16:05</td><td>0</td><td>1</td><td>0.75</td></tr>
+<tr><td>2018-10-27 00:16:04</td><td>0</td><td>1.0025063</td><td>0.7518797</td></tr>
+</table>
+</center>
+</html>
+```
+
+This is how it looks when rendered by a web browser:
+
+![image](https://user-images.githubusercontent.com/2662304/47597887-bafbf480-d99c-11e8-864a-d880bb8d2e5b.png)
+
+
+---
+
+Get a JSON array with the average bandwidth rate of the mysql server, over the last hour, in 6 values
+(one every 10 minutes), and return the date and time in milliseconds:
+
+Netdata always returns bandwidth rates in `kilobits/s`.
+
+```bash
+# curl -Ss 'https://registry.my-netdata.io/api/v1/data?chart=mysql_local.net&format=csvjsonarray&after=-3600&points=6&group=average&options=abs,ms'
+[
+["time","in","out"],
+[1540599600000,0.7499986,120.2810185],
+[1540599000000,0.7500019,120.2815509],
+[1540598400000,0.7499999,120.2812319],
+[1540597800000,0.7500044,120.2819634],
+[1540597200000,0.7499968,120.2807337],
+[1540596600000,0.7499988,120.2810527]
+]
+``` 
+
+---
+
+Get the number of processes started per minute, for the last 10 minutes, in `markdown` format:
+
+```bash
+# curl -Ss 'https://registry.my-netdata.io/api/v1/data?chart=system.forks&format=markdown&after=-600&points=10&group=sum'
+time|started
+:---:|:---:
+2018-10-27 03:52:00|245.1706149
+2018-10-27 03:51:00|152.6654636
+2018-10-27 03:50:00|163.1755789
+2018-10-27 03:49:00|176.1574766
+2018-10-27 03:48:00|178.0137076
+2018-10-27 03:47:00|183.8306543
+2018-10-27 03:46:00|264.1635621
+2018-10-27 03:45:00|205.001551
+2018-10-27 03:44:00|7026.9852167
+2018-10-27 03:43:00|205.9904794
+```
+
+And this is how it looks when formatted:
+
+time|started
+:---:|:---:
+2018-10-27 03:52:00|245.1706149
+2018-10-27 03:51:00|152.6654636
+2018-10-27 03:50:00|163.1755789
+2018-10-27 03:49:00|176.1574766
+2018-10-27 03:48:00|178.0137076
+2018-10-27 03:47:00|183.8306543
+2018-10-27 03:46:00|264.1635621
+2018-10-27 03:45:00|205.001551
+2018-10-27 03:44:00|7026.9852167
+2018-10-27 03:43:00|205.9904794
diff --git a/web/api/formatters/csv/csv.c b/web/api/formatters/csv/csv.c
new file mode 100644
index 000000000..53bf29828
--- /dev/null
+++ b/web/api/formatters/csv/csv.c
@@ -0,0 +1,143 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "libnetdata/libnetdata.h"
+#include "csv.h"
+
+void rrdr2csv(RRDR *r, BUFFER *wb, uint32_t format, RRDR_OPTIONS options, const char *startline, const char *separator, const char *endline, const char *betweenlines) {
+    rrdset_check_rdlock(r->st);
+
+    //info("RRD2CSV(): %s: BEGIN", r->st->id);
+    long c, i;
+    RRDDIM *d;
+
+    // print the csv header
+    for(c = 0, i = 0, d = r->st->dimensions; d && c < r->d ;c++, d = d->next) {
+        if(unlikely(r->od[c] & RRDR_DIMENSION_HIDDEN)) continue;
+        if(unlikely((options & RRDR_OPTION_NONZERO) && !(r->od[c] & RRDR_DIMENSION_NONZERO))) continue;
+
+        if(!i) {
+            buffer_strcat(wb, startline);
+            if(options & RRDR_OPTION_LABEL_QUOTES) buffer_strcat(wb, "\"");
+            buffer_strcat(wb, "time");
+            if(options & RRDR_OPTION_LABEL_QUOTES) buffer_strcat(wb, "\"");
+        }
+        buffer_strcat(wb, separator);
+        if(options & RRDR_OPTION_LABEL_QUOTES) buffer_strcat(wb, "\"");
+        buffer_strcat(wb, d->name);
+        if(options & RRDR_OPTION_LABEL_QUOTES) buffer_strcat(wb, "\"");
+        i++;
+    }
+    buffer_strcat(wb, endline);
+
+    if(format == DATASOURCE_CSV_MARKDOWN) {
+        // print the --- line after header
+        for(c = 0, i = 0, d = r->st->dimensions; d && c < r->d ;c++, d = d->next) {
+            if(unlikely(r->od[c] & RRDR_DIMENSION_HIDDEN)) continue;
+            if(unlikely((options & RRDR_OPTION_NONZERO) && !(r->od[c] & RRDR_DIMENSION_NONZERO))) continue;
+
+            if(!i) {
+                buffer_strcat(wb, startline);
+                if(options & RRDR_OPTION_LABEL_QUOTES) buffer_strcat(wb, "\"");
+                buffer_strcat(wb, ":---:");
+                if(options & RRDR_OPTION_LABEL_QUOTES) buffer_strcat(wb, "\"");
+            }
+            buffer_strcat(wb, separator);
+            if(options & RRDR_OPTION_LABEL_QUOTES) buffer_strcat(wb, "\"");
+            buffer_strcat(wb, ":---:");
+            if(options & RRDR_OPTION_LABEL_QUOTES) buffer_strcat(wb, "\"");
+            i++;
+        }
+        buffer_strcat(wb, endline);
+    }
+
+    if(!i) {
+        // no dimensions present
+        return;
+    }
+
+    long start = 0, end = rrdr_rows(r), step = 1;
+    if(!(options & RRDR_OPTION_REVERSED)) {
+        start = rrdr_rows(r) - 1;
+        end = -1;
+        step = -1;
+    }
+
+    // for each line in the array
+    calculated_number total = 1;
+    for(i = start; i != end ;i += step) {
+        calculated_number *cn = &r->v[ i * r->d ];
+        RRDR_VALUE_FLAGS *co = &r->o[ i * r->d ];
+
+        buffer_strcat(wb, betweenlines);
+        buffer_strcat(wb, startline);
+
+        time_t now = r->t[i];
+
+        if((options & RRDR_OPTION_SECONDS) || (options & RRDR_OPTION_MILLISECONDS)) {
+            // print the timestamp of the line
+            buffer_rrd_value(wb, (calculated_number)now);
+            // in ms
+            if(options & RRDR_OPTION_MILLISECONDS) buffer_strcat(wb, "000");
+        }
+        else {
+            // generate the local date time
+            struct tm tmbuf, *tm = localtime_r(&now, &tmbuf);
+            if(!tm) { error("localtime() failed."); continue; }
+            buffer_date(wb, tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec);
+        }
+
+        int set_min_max = 0;
+        if(unlikely(options & RRDR_OPTION_PERCENTAGE)) {
+            total = 0;
+            for(c = 0, d = r->st->dimensions; d && c < r->d ;c++, d = d->next) {
+                calculated_number n = cn[c];
+
+                if(likely((options & RRDR_OPTION_ABSOLUTE) && n < 0))
+                    n = -n;
+
+                total += n;
+            }
+            // prevent a division by zero
+            if(total == 0) total = 1;
+            set_min_max = 1;
+        }
+
+        // for each dimension
+        for(c = 0, d = r->st->dimensions; d && c < r->d ;c++, d = d->next) {
+            if(unlikely(r->od[c] & RRDR_DIMENSION_HIDDEN)) continue;
+            if(unlikely((options & RRDR_OPTION_NONZERO) && !(r->od[c] & RRDR_DIMENSION_NONZERO))) continue;
+
+            buffer_strcat(wb, separator);
+
+            calculated_number n = cn[c];
+
+            if(co[c] & RRDR_VALUE_EMPTY) {
+                if(options & RRDR_OPTION_NULL2ZERO)
+                    buffer_strcat(wb, "0");
+                else
+                    buffer_strcat(wb, "null");
+            }
+            else {
+                if(unlikely((options & RRDR_OPTION_ABSOLUTE) && n < 0))
+                    n = -n;
+
+                if(unlikely(options & RRDR_OPTION_PERCENTAGE)) {
+                    n = n * 100 / total;
+
+                    if(unlikely(set_min_max)) {
+                        r->min = r->max = n;
+                        set_min_max = 0;
+                    }
+
+                    if(n < r->min) r->min = n;
+                    if(n > r->max) r->max = n;
+                }
+
+                buffer_rrd_value(wb, n);
+            }
+        }
+
+        buffer_strcat(wb, endline);
+    }
+    //info("RRD2CSV(): %s: END", r->st->id);
+}
diff --git a/web/api/formatters/csv/csv.h b/web/api/formatters/csv/csv.h
new file mode 100644
index 000000000..a89742d34
--- /dev/null
+++ b/web/api/formatters/csv/csv.h
@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_API_FORMATTER_CSV_H
+#define NETDATA_API_FORMATTER_CSV_H
+
+#include "web/api/queries/rrdr.h"
+
+extern void rrdr2csv(RRDR *r, BUFFER *wb, uint32_t format, RRDR_OPTIONS options, const char *startline, const char *separator, const char *endline, const char *betweenlines);
+
+#include "../rrd2json.h"
+
+#endif //NETDATA_API_FORMATTER_CSV_H
diff --git a/web/api/formatters/json/Makefile.am b/web/api/formatters/json/Makefile.am
new file mode 100644
index 000000000..19554bed8
--- /dev/null
+++ b/web/api/formatters/json/Makefile.am
@@ -0,0 +1,8 @@
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+
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+
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diff --git a/web/api/formatters/json/Makefile.in b/web/api/formatters/json/Makefile.in
new file mode 100644
index 000000000..5289347d0
--- /dev/null
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@@ -0,0 +1,464 @@
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+OPTIONAL_ZLIB_CLFAGS = @OPTIONAL_ZLIB_CLFAGS@
+OPTIONAL_ZLIB_LIBS = @OPTIONAL_ZLIB_LIBS@
+PACKAGE = @PACKAGE@
+PACKAGE_BUGREPORT = @PACKAGE_BUGREPORT@
+PACKAGE_NAME = @PACKAGE_NAME@
+PACKAGE_RPM_RELEASE = @PACKAGE_RPM_RELEASE@
+PACKAGE_RPM_VERSION = @PACKAGE_RPM_VERSION@
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+PATH_SEPARATOR = @PATH_SEPARATOR@
+PKG_CONFIG = @PKG_CONFIG@
+PKG_CONFIG_LIBDIR = @PKG_CONFIG_LIBDIR@
+PKG_CONFIG_PATH = @PKG_CONFIG_PATH@
+PTHREAD_CC = @PTHREAD_CC@
+PTHREAD_CFLAGS = @PTHREAD_CFLAGS@
+PTHREAD_LIBS = @PTHREAD_LIBS@
+SET_MAKE = @SET_MAKE@
+SHELL = @SHELL@
+SSE_CANDIDATE = @SSE_CANDIDATE@
+STRIP = @STRIP@
+UUID_CFLAGS = @UUID_CFLAGS@
+UUID_LIBS = @UUID_LIBS@
+VERSION = @VERSION@
+ZLIB_CFLAGS = @ZLIB_CFLAGS@
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+abs_builddir = @abs_builddir@
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+build_os = @build_os@
+build_target = @build_target@
+build_vendor = @build_vendor@
+builddir = @builddir@
+cachedir = @cachedir@
+chartsdir = @chartsdir@
+configdir = @configdir@
+datadir = @datadir@
+datarootdir = @datarootdir@
+docdir = @docdir@
+dvidir = @dvidir@
+exec_prefix = @exec_prefix@
+has_jemalloc = @has_jemalloc@
+has_tcmalloc = @has_tcmalloc@
+host = @host@
+host_alias = @host_alias@
+host_cpu = @host_cpu@
+host_os = @host_os@
+host_vendor = @host_vendor@
+htmldir = @htmldir@
+includedir = @includedir@
+infodir = @infodir@
+install_sh = @install_sh@
+libconfigdir = @libconfigdir@
+libdir = @libdir@
+libexecdir = @libexecdir@
+localedir = @localedir@
+localstatedir = @localstatedir@
+logdir = @logdir@
+mandir = @mandir@
+mkdir_p = @mkdir_p@
+nodedir = @nodedir@
+oldincludedir = @oldincludedir@
+pdfdir = @pdfdir@
+pluginsdir = @pluginsdir@
+prefix = @prefix@
+program_transform_name = @program_transform_name@
+psdir = @psdir@
+pythondir = @pythondir@
+registrydir = @registrydir@
+sbindir = @sbindir@
+sharedstatedir = @sharedstatedir@
+srcdir = @srcdir@
+sysconfdir = @sysconfdir@
+target_alias = @target_alias@
+top_build_prefix = @top_build_prefix@
+top_builddir = @top_builddir@
+top_srcdir = @top_srcdir@
+varlibdir = @varlibdir@
+webdir = @webdir@
+AUTOMAKE_OPTIONS = subdir-objects
+MAINTAINERCLEANFILES = $(srcdir)/Makefile.in
+dist_noinst_DATA = \
+	README.md \
+	$(NULL)
+
+all: all-am
+
+.SUFFIXES:
+$(srcdir)/Makefile.in: @MAINTAINER_MODE_TRUE@ $(srcdir)/Makefile.am  $(am__configure_deps)
+	@for dep in $?; do \
+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
+	      ( cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh ) \
+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --gnu web/api/formatters/json/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --gnu web/api/formatters/json/Makefile
+.PRECIOUS: Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+	@case '$?' in \
+	  *config.status*) \
+	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
+	  *) \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__depfiles_maybe)'; \
+	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__depfiles_maybe);; \
+	esac;
+
+$(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+
+$(top_srcdir)/configure: @MAINTAINER_MODE_TRUE@ $(am__configure_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(ACLOCAL_M4): @MAINTAINER_MODE_TRUE@ $(am__aclocal_m4_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(am__aclocal_m4_deps):
+tags TAGS:
+
+ctags CTAGS:
+
+cscope cscopelist:
+
+
+distdir: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: check-am
+all-am: Makefile $(DATA)
+installdirs:
+install: install-am
+install-exec: install-exec-am
+install-data: install-data-am
+uninstall: uninstall-am
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-am
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+	-test -z "$(MAINTAINERCLEANFILES)" || rm -f $(MAINTAINERCLEANFILES)
+clean: clean-am
+
+clean-am: clean-generic mostlyclean-am
+
+distclean: distclean-am
+	-rm -f Makefile
+distclean-am: clean-am distclean-generic
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+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
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+info: info-am
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+install-dvi-am:
+
+install-exec-am:
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+install-html: install-html-am
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+install-pdf-am:
+
+install-ps: install-ps-am
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+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
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+mostlyclean-am: mostlyclean-generic
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+pdf: pdf-am
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+ps-am:
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+uninstall-am:
+
+.MAKE: install-am install-strip
+
+.PHONY: all all-am check check-am clean clean-generic cscopelist-am \
+	ctags-am distclean distclean-generic distdir dvi dvi-am html \
+	html-am info info-am install install-am install-data \
+	install-data-am install-dvi install-dvi-am install-exec \
+	install-exec-am install-html install-html-am install-info \
+	install-info-am install-man install-pdf install-pdf-am \
+	install-ps install-ps-am install-strip installcheck \
+	installcheck-am installdirs maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-generic pdf \
+	pdf-am ps ps-am tags-am uninstall uninstall-am
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/web/api/formatters/json/README.md b/web/api/formatters/json/README.md
new file mode 100644
index 000000000..4f0bad5ca
--- /dev/null
+++ b/web/api/formatters/json/README.md
@@ -0,0 +1,150 @@
+# JSON formatter
+
+The CSV formatter presents [results of database queries](../../queries) in the following formats:
+
+format|content type|description
+:---:|:---:|:-----
+`json`|application/json|return the query result as a json object
+`jsonp`|application/json|return the query result as a JSONP javascript callback
+`datatable`|application/json|return the query result as a Google `datatable`
+`datasource`|application/json|return the query result as a Google Visualization Provider `datasource` javascript callback
+
+The CSV formatter respects the following API `&options=`:
+
+option|supported|description
+:---:|:---:|:---
+`google_json`|yes|enable the Google flavor of JSON (using double quotes for strings and `Date()` function for dates
+`objectrows`|yes|return each row as an object, instead of an array
+`nonzero`|yes|to return only the dimensions that have at least a non-zero value
+`flip`|yes|to return the rows older to newer (the default is newer to older)
+`seconds`|yes|to return the date and time in unix timestamp
+`ms`|yes|to return the date and time in unit timestamp as milliseconds
+`percent`|yes|to replace all values with their percentage over the row total
+`abs`|yes|to turn all values positive
+`null2zero`|yes|to replace gaps with zeros (the default prints the string `null`
+
+## Examples
+
+To show the differences between each format, in the following examples we query the same
+chart (having just one dimension called `active`), changing only the query `format` and its `options`.
+
+> Using `format=json` and `options=`
+
+```bash
+# curl -Ss 'https://registry.my-netdata.io/api/v1/data?chart=nginx_local.connections&after=-3600&points=6&group=average&format=json&options='
+{
+ "labels": ["time", "active"],
+    "data":
+ [
+      [ 1540644600, 224.2516667],
+      [ 1540644000, 229.29],
+      [ 1540643400, 222.41],
+      [ 1540642800, 226.6816667],
+      [ 1540642200, 246.4083333],
+      [ 1540641600, 241.0966667]
+  ]
+}
+```
+
+> Using `format=json` and `options=objectrows`
+
+```bash
+# curl -Ss 'https://registry.my-netdata.io/api/v1/data?chart=nginx_local.connections&after=-3600&points=6&group=average&format=json&options=objectrows'
+{
+ "labels": ["time", "active"],
+    "data":
+ [
+      { "time": 1540644600, "active": 224.2516667},
+      { "time": 1540644000, "active": 229.29},
+      { "time": 1540643400, "active": 222.41},
+      { "time": 1540642800, "active": 226.6816667},
+      { "time": 1540642200, "active": 246.4083333},
+      { "time": 1540641600, "active": 241.0966667}
+  ]
+}
+```
+
+> Using `format=json` and `options=objectrows,google_json`
+
+```bash
+# curl -Ss 'https://registry.my-netdata.io/api/v1/data?chart=nginx_local.connections&after=-3600&points=6&group=average&formatjson&options=objectrows,google_json'
+{
+ "labels": ["time", "active"],
+    "data":
+ [
+      { "time": new Date(2018,9,27,12,50,0), "active": 224.2516667},
+      { "time": new Date(2018,9,27,12,40,0), "active": 229.29},
+      { "time": new Date(2018,9,27,12,30,0), "active": 222.41},
+      { "time": new Date(2018,9,27,12,20,0), "active": 226.6816667},
+      { "time": new Date(2018,9,27,12,10,0), "active": 246.4083333},
+      { "time": new Date(2018,9,27,12,0,0), "active": 241.0966667}
+  ]
+}
+```
+
+> Using `format=jsonp` and `options=`
+
+```bash
+curl -Ss 'https://registry.my-netdata.io/api/v1/data?chart=nginx_local.connections&after=-3600&points=6&group=average&formjsonp&options='
+callback({
+ "labels": ["time", "active"],
+    "data":
+ [
+      [ 1540645200, 235.885],
+      [ 1540644600, 224.2516667],
+      [ 1540644000, 229.29],
+      [ 1540643400, 222.41],
+      [ 1540642800, 226.6816667],
+      [ 1540642200, 246.4083333]
+  ]
+});
+```
+
+> Using `format=datatable` and `options=`
+
+```bash
+$ curl -Ss 'https://registry.my-netdata.io/api/v1/data?chart=nginx_local.connections&after=-3600&points=6&group=average&formdatatable&options='
+{
+ "cols":
+ [
+        {"id":"","label":"time","pattern":"","type":"datetime"},
+        {"id":"","label":"","pattern":"","type":"string","p":{"role":"annotation"}},
+        {"id":"","label":"","pattern":"","type":"string","p":{"role":"annotationText"}},
+     {"id":"","label":"active","pattern":"","type":"number"}
+  ],
+    "rows":
+ [
+        {"c":[{"v":"Date(2018,9,27,13,0,0)"},{"v":null},{"v":null},{"v":235.885}]},
+        {"c":[{"v":"Date(2018,9,27,12,50,0)"},{"v":null},{"v":null},{"v":224.2516667}]},
+        {"c":[{"v":"Date(2018,9,27,12,40,0)"},{"v":null},{"v":null},{"v":229.29}]},
+        {"c":[{"v":"Date(2018,9,27,12,30,0)"},{"v":null},{"v":null},{"v":222.41}]},
+        {"c":[{"v":"Date(2018,9,27,12,20,0)"},{"v":null},{"v":null},{"v":226.6816667}]},
+        {"c":[{"v":"Date(2018,9,27,12,10,0)"},{"v":null},{"v":null},{"v":246.4083333}]}
+  ]
+}
+```
+
+> Using `format=datasource` and `options=`
+
+```bash
+curl -Ss 'https://registry.my-netdata.io/api/v1/data?chart=nginx_local.connections&after=-3600&points=6&group=average&format=datasource&options='
+google.visualization.Query.setResponse({version:'0.6',reqId:'0',status:'ok',sig:'1540645368',table:{
+ "cols":
+ [
+        {"id":"","label":"time","pattern":"","type":"datetime"},
+        {"id":"","label":"","pattern":"","type":"string","p":{"role":"annotation"}},
+        {"id":"","label":"","pattern":"","type":"string","p":{"role":"annotationText"}},
+     {"id":"","label":"active","pattern":"","type":"number"}
+  ],
+    "rows":
+ [
+        {"c":[{"v":"Date(2018,9,27,13,0,0)"},{"v":null},{"v":null},{"v":235.885}]},
+        {"c":[{"v":"Date(2018,9,27,12,50,0)"},{"v":null},{"v":null},{"v":224.2516667}]},
+        {"c":[{"v":"Date(2018,9,27,12,40,0)"},{"v":null},{"v":null},{"v":229.29}]},
+        {"c":[{"v":"Date(2018,9,27,12,30,0)"},{"v":null},{"v":null},{"v":222.41}]},
+        {"c":[{"v":"Date(2018,9,27,12,20,0)"},{"v":null},{"v":null},{"v":226.6816667}]},
+        {"c":[{"v":"Date(2018,9,27,12,10,0)"},{"v":null},{"v":null},{"v":246.4083333}]}
+  ]
+}});
+```
+
diff --git a/web/api/formatters/json/json.c b/web/api/formatters/json/json.c
new file mode 100644
index 000000000..66b3b9c83
--- /dev/null
+++ b/web/api/formatters/json/json.c
@@ -0,0 +1,246 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "json.h"
+
+#define JSON_DATES_JS 1
+#define JSON_DATES_TIMESTAMP 2
+
+void rrdr2json(RRDR *r, BUFFER *wb, RRDR_OPTIONS options, int datatable) {
+    rrdset_check_rdlock(r->st);
+
+    //info("RRD2JSON(): %s: BEGIN", r->st->id);
+    int row_annotations = 0, dates, dates_with_new = 0;
+    char kq[2] = "",                    // key quote
+            sq[2] = "",                     // string quote
+            pre_label[101] = "",            // before each label
+            post_label[101] = "",           // after each label
+            pre_date[101] = "",             // the beginning of line, to the date
+            post_date[101] = "",            // closing the date
+            pre_value[101] = "",            // before each value
+            post_value[101] = "",           // after each value
+            post_line[101] = "",            // at the end of each row
+            normal_annotation[201] = "",    // default row annotation
+            overflow_annotation[201] = "",  // overflow row annotation
+            data_begin[101] = "",           // between labels and values
+            finish[101] = "";               // at the end of everything
+
+    if(datatable) {
+        dates = JSON_DATES_JS;
+        if( options & RRDR_OPTION_GOOGLE_JSON ) {
+            kq[0] = '\0';
+            sq[0] = '\'';
+        }
+        else {
+            kq[0] = '"';
+            sq[0] = '"';
+        }
+        row_annotations = 1;
+        snprintfz(pre_date,   100, "        {%sc%s:[{%sv%s:%s", kq, kq, kq, kq, sq);
+        snprintfz(post_date,  100, "%s}", sq);
+        snprintfz(pre_label,  100, ",\n     {%sid%s:%s%s,%slabel%s:%s", kq, kq, sq, sq, kq, kq, sq);
+        snprintfz(post_label, 100, "%s,%spattern%s:%s%s,%stype%s:%snumber%s}", sq, kq, kq, sq, sq, kq, kq, sq, sq);
+        snprintfz(pre_value,  100, ",{%sv%s:", kq, kq);
+        strcpy(post_value,         "}");
+        strcpy(post_line,          "]}");
+        snprintfz(data_begin, 100, "\n  ],\n    %srows%s:\n [\n", kq, kq);
+        strcpy(finish,             "\n  ]\n}");
+
+        snprintfz(overflow_annotation, 200, ",{%sv%s:%sRESET OR OVERFLOW%s},{%sv%s:%sThe counters have been wrapped.%s}", kq, kq, sq, sq, kq, kq, sq, sq);
+        snprintfz(normal_annotation,   200, ",{%sv%s:null},{%sv%s:null}", kq, kq, kq, kq);
+
+        buffer_sprintf(wb, "{\n %scols%s:\n [\n", kq, kq);
+        buffer_sprintf(wb, "        {%sid%s:%s%s,%slabel%s:%stime%s,%spattern%s:%s%s,%stype%s:%sdatetime%s},\n", kq, kq, sq, sq, kq, kq, sq, sq, kq, kq, sq, sq, kq, kq, sq, sq);
+        buffer_sprintf(wb, "        {%sid%s:%s%s,%slabel%s:%s%s,%spattern%s:%s%s,%stype%s:%sstring%s,%sp%s:{%srole%s:%sannotation%s}},\n", kq, kq, sq, sq, kq, kq, sq, sq, kq, kq, sq, sq, kq, kq, sq, sq, kq, kq, kq, kq, sq, sq);
+        buffer_sprintf(wb, "        {%sid%s:%s%s,%slabel%s:%s%s,%spattern%s:%s%s,%stype%s:%sstring%s,%sp%s:{%srole%s:%sannotationText%s}}", kq, kq, sq, sq, kq, kq, sq, sq, kq, kq, sq, sq, kq, kq, sq, sq, kq, kq, kq, kq, sq, sq);
+
+        // remove the valueobjects flag
+        // google wants its own keys
+        if(options & RRDR_OPTION_OBJECTSROWS)
+            options &= ~RRDR_OPTION_OBJECTSROWS;
+    }
+    else {
+        kq[0] = '"';
+        sq[0] = '"';
+        if(options & RRDR_OPTION_GOOGLE_JSON) {
+            dates = JSON_DATES_JS;
+            dates_with_new = 1;
+        }
+        else {
+            dates = JSON_DATES_TIMESTAMP;
+            dates_with_new = 0;
+        }
+        if( options & RRDR_OPTION_OBJECTSROWS )
+            strcpy(pre_date, "      { ");
+        else
+            strcpy(pre_date, "      [ ");
+        strcpy(pre_label,  ", \"");
+        strcpy(post_label, "\"");
+        strcpy(pre_value,  ", ");
+        if( options & RRDR_OPTION_OBJECTSROWS )
+            strcpy(post_line, "}");
+        else
+            strcpy(post_line, "]");
+        snprintfz(data_begin, 100, "],\n    %sdata%s:\n [\n", kq, kq);
+        strcpy(finish,             "\n  ]\n}");
+
+        buffer_sprintf(wb, "{\n %slabels%s: [", kq, kq);
+        buffer_sprintf(wb, "%stime%s", sq, sq);
+    }
+
+    // -------------------------------------------------------------------------
+    // print the JSON header
+
+    long c, i;
+    RRDDIM *rd;
+
+    // print the header lines
+    for(c = 0, i = 0, rd = r->st->dimensions; rd && c < r->d ;c++, rd = rd->next) {
+        if(unlikely(r->od[c] & RRDR_DIMENSION_HIDDEN)) continue;
+        if(unlikely((options & RRDR_OPTION_NONZERO) && !(r->od[c] & RRDR_DIMENSION_NONZERO))) continue;
+
+        buffer_strcat(wb, pre_label);
+        buffer_strcat(wb, rd->name);
+        buffer_strcat(wb, post_label);
+        i++;
+    }
+    if(!i) {
+        buffer_strcat(wb, pre_label);
+        buffer_strcat(wb, "no data");
+        buffer_strcat(wb, post_label);
+    }
+
+    // print the begin of row data
+    buffer_strcat(wb, data_begin);
+
+    // if all dimensions are hidden, print a null
+    if(!i) {
+        buffer_strcat(wb, finish);
+        return;
+    }
+
+    long start = 0, end = rrdr_rows(r), step = 1;
+    if(!(options & RRDR_OPTION_REVERSED)) {
+        start = rrdr_rows(r) - 1;
+        end = -1;
+        step = -1;
+    }
+
+    // for each line in the array
+    calculated_number total = 1;
+    for(i = start; i != end ;i += step) {
+        calculated_number *cn = &r->v[ i * r->d ];
+        RRDR_VALUE_FLAGS *co = &r->o[ i * r->d ];
+
+        time_t now = r->t[i];
+
+        if(dates == JSON_DATES_JS) {
+            // generate the local date time
+            struct tm tmbuf, *tm = localtime_r(&now, &tmbuf);
+            if(!tm) { error("localtime_r() failed."); continue; }
+
+            if(likely(i != start)) buffer_strcat(wb, ",\n");
+            buffer_strcat(wb, pre_date);
+
+            if( options & RRDR_OPTION_OBJECTSROWS )
+                buffer_sprintf(wb, "%stime%s: ", kq, kq);
+
+            if(dates_with_new)
+                buffer_strcat(wb, "new ");
+
+            buffer_jsdate(wb, tm->tm_year + 1900, tm->tm_mon, tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec);
+
+            buffer_strcat(wb, post_date);
+
+            if(row_annotations) {
+                // google supports one annotation per row
+                int annotation_found = 0;
+                for(c = 0, rd = r->st->dimensions; rd ;c++, rd = rd->next) {
+                    if(unlikely(!(r->od[c] & RRDR_DIMENSION_SELECTED))) continue;
+
+                    if(co[c] & RRDR_VALUE_RESET) {
+                        buffer_strcat(wb, overflow_annotation);
+                        annotation_found = 1;
+                        break;
+                    }
+                }
+                if(!annotation_found)
+                    buffer_strcat(wb, normal_annotation);
+            }
+        }
+        else {
+            // print the timestamp of the line
+            if(likely(i != start)) buffer_strcat(wb, ",\n");
+            buffer_strcat(wb, pre_date);
+
+            if( options & RRDR_OPTION_OBJECTSROWS )
+                buffer_sprintf(wb, "%stime%s: ", kq, kq);
+
+            buffer_rrd_value(wb, (calculated_number)r->t[i]);
+            // in ms
+            if(options & RRDR_OPTION_MILLISECONDS) buffer_strcat(wb, "000");
+
+            buffer_strcat(wb, post_date);
+        }
+
+        int set_min_max = 0;
+        if(unlikely(options & RRDR_OPTION_PERCENTAGE)) {
+            total = 0;
+            for(c = 0, rd = r->st->dimensions; rd && c < r->d ;c++, rd = rd->next) {
+                calculated_number n = cn[c];
+
+                if(likely((options & RRDR_OPTION_ABSOLUTE) && n < 0))
+                    n = -n;
+
+                total += n;
+            }
+            // prevent a division by zero
+            if(total == 0) total = 1;
+            set_min_max = 1;
+        }
+
+        // for each dimension
+        for(c = 0, rd = r->st->dimensions; rd && c < r->d ;c++, rd = rd->next) {
+            if(unlikely(r->od[c] & RRDR_DIMENSION_HIDDEN)) continue;
+            if(unlikely((options & RRDR_OPTION_NONZERO) && !(r->od[c] & RRDR_DIMENSION_NONZERO))) continue;
+
+            calculated_number n = cn[c];
+
+            buffer_strcat(wb, pre_value);
+
+            if( options & RRDR_OPTION_OBJECTSROWS )
+                buffer_sprintf(wb, "%s%s%s: ", kq, rd->name, kq);
+
+            if(co[c] & RRDR_VALUE_EMPTY) {
+                if(options & RRDR_OPTION_NULL2ZERO)
+                    buffer_strcat(wb, "0");
+                else
+                    buffer_strcat(wb, "null");
+            }
+            else {
+                if(unlikely((options & RRDR_OPTION_ABSOLUTE) && n < 0))
+                    n = -n;
+
+                if(unlikely(options & RRDR_OPTION_PERCENTAGE)) {
+                    n = n * 100 / total;
+
+                    if(unlikely(set_min_max)) {
+                        r->min = r->max = n;
+                        set_min_max = 0;
+                    }
+
+                    if(n < r->min) r->min = n;
+                    if(n > r->max) r->max = n;
+                }
+
+                buffer_rrd_value(wb, n);
+            }
+
+            buffer_strcat(wb, post_value);
+        }
+
+        buffer_strcat(wb, post_line);
+    }
+
+    buffer_strcat(wb, finish);
+    //info("RRD2JSON(): %s: END", r->st->id);
+}
diff --git a/web/api/formatters/json/json.h b/web/api/formatters/json/json.h
new file mode 100644
index 000000000..01363ce01
--- /dev/null
+++ b/web/api/formatters/json/json.h
@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_API_FORMATTER_JSON_H
+#define NETDATA_API_FORMATTER_JSON_H
+
+#include "../rrd2json.h"
+
+extern void rrdr2json(RRDR *r, BUFFER *wb, RRDR_OPTIONS options, int datatable);
+
+#endif //NETDATA_API_FORMATTER_JSON_H
diff --git a/web/api/formatters/json_wrapper.c b/web/api/formatters/json_wrapper.c
new file mode 100644
index 000000000..253883568
--- /dev/null
+++ b/web/api/formatters/json_wrapper.c
@@ -0,0 +1,210 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "json_wrapper.h"
+
+void rrdr_json_wrapper_begin(RRDR *r, BUFFER *wb, uint32_t format, RRDR_OPTIONS options, int string_value) {
+    rrdset_check_rdlock(r->st);
+
+    long rows = rrdr_rows(r);
+    long c, i;
+    RRDDIM *rd;
+
+    //info("JSONWRAPPER(): %s: BEGIN", r->st->id);
+    char kq[2] = "",                    // key quote
+            sq[2] = "";                     // string quote
+
+    if( options & RRDR_OPTION_GOOGLE_JSON ) {
+        kq[0] = '\0';
+        sq[0] = '\'';
+    }
+    else {
+        kq[0] = '"';
+        sq[0] = '"';
+    }
+
+    buffer_sprintf(wb, "{\n"
+                       "   %sapi%s: 1,\n"
+                       "   %sid%s: %s%s%s,\n"
+                       "   %sname%s: %s%s%s,\n"
+                       "   %sview_update_every%s: %d,\n"
+                       "   %supdate_every%s: %d,\n"
+                       "   %sfirst_entry%s: %u,\n"
+                       "   %slast_entry%s: %u,\n"
+                       "   %sbefore%s: %u,\n"
+                       "   %safter%s: %u,\n"
+                       "   %sdimension_names%s: ["
+                   , kq, kq
+                   , kq, kq, sq, r->st->id, sq
+                   , kq, kq, sq, r->st->name, sq
+                   , kq, kq, r->update_every
+                   , kq, kq, r->st->update_every
+                   , kq, kq, (uint32_t)rrdset_first_entry_t(r->st)
+                   , kq, kq, (uint32_t)rrdset_last_entry_t(r->st)
+                   , kq, kq, (uint32_t)r->before
+                   , kq, kq, (uint32_t)r->after
+                   , kq, kq);
+
+    for(c = 0, i = 0, rd = r->st->dimensions; rd && c < r->d ;c++, rd = rd->next) {
+        if(unlikely(r->od[c] & RRDR_DIMENSION_HIDDEN)) continue;
+        if(unlikely((options & RRDR_OPTION_NONZERO) && !(r->od[c] & RRDR_DIMENSION_NONZERO))) continue;
+
+        if(i) buffer_strcat(wb, ", ");
+        buffer_strcat(wb, sq);
+        buffer_strcat(wb, rd->name);
+        buffer_strcat(wb, sq);
+        i++;
+    }
+    if(!i) {
+#ifdef NETDATA_INTERNAL_CHECKS
+        error("RRDR is empty for %s (RRDR has %d dimensions, options is 0x%08x)", r->st->id, r->d, options);
+#endif
+        rows = 0;
+        buffer_strcat(wb, sq);
+        buffer_strcat(wb, "no data");
+        buffer_strcat(wb, sq);
+    }
+
+    buffer_sprintf(wb, "],\n"
+                       "   %sdimension_ids%s: ["
+                   , kq, kq);
+
+    for(c = 0, i = 0, rd = r->st->dimensions; rd && c < r->d ;c++, rd = rd->next) {
+        if(unlikely(r->od[c] & RRDR_DIMENSION_HIDDEN)) continue;
+        if(unlikely((options & RRDR_OPTION_NONZERO) && !(r->od[c] & RRDR_DIMENSION_NONZERO))) continue;
+
+        if(i) buffer_strcat(wb, ", ");
+        buffer_strcat(wb, sq);
+        buffer_strcat(wb, rd->id);
+        buffer_strcat(wb, sq);
+        i++;
+    }
+    if(!i) {
+        rows = 0;
+        buffer_strcat(wb, sq);
+        buffer_strcat(wb, "no data");
+        buffer_strcat(wb, sq);
+    }
+
+    buffer_sprintf(wb, "],\n"
+                       "   %slatest_values%s: ["
+                   , kq, kq);
+
+    for(c = 0, i = 0, rd = r->st->dimensions; rd && c < r->d ;c++, rd = rd->next) {
+        if(unlikely(r->od[c] & RRDR_DIMENSION_HIDDEN)) continue;
+        if(unlikely((options & RRDR_OPTION_NONZERO) && !(r->od[c] & RRDR_DIMENSION_NONZERO))) continue;
+
+        if(i) buffer_strcat(wb, ", ");
+        i++;
+
+        storage_number n = rd->values[rrdset_last_slot(r->st)];
+
+        if(!does_storage_number_exist(n))
+            buffer_strcat(wb, "null");
+        else
+            buffer_rrd_value(wb, unpack_storage_number(n));
+    }
+    if(!i) {
+        rows = 0;
+        buffer_strcat(wb, "null");
+    }
+
+    buffer_sprintf(wb, "],\n"
+                       "   %sview_latest_values%s: ["
+                   , kq, kq);
+
+    i = 0;
+    if(rows) {
+        calculated_number total = 1;
+
+        if(unlikely(options & RRDR_OPTION_PERCENTAGE)) {
+            total = 0;
+            for(c = 0, rd = r->st->dimensions; rd && c < r->d ;c++, rd = rd->next) {
+                calculated_number *cn = &r->v[ (rrdr_rows(r) - 1) * r->d ];
+                calculated_number n = cn[c];
+
+                if(likely((options & RRDR_OPTION_ABSOLUTE) && n < 0))
+                    n = -n;
+
+                total += n;
+            }
+            // prevent a division by zero
+            if(total == 0) total = 1;
+        }
+
+        for(c = 0, i = 0, rd = r->st->dimensions; rd && c < r->d ;c++, rd = rd->next) {
+            if(unlikely(r->od[c] & RRDR_DIMENSION_HIDDEN)) continue;
+            if(unlikely((options & RRDR_OPTION_NONZERO) && !(r->od[c] & RRDR_DIMENSION_NONZERO))) continue;
+
+            if(i) buffer_strcat(wb, ", ");
+            i++;
+
+            calculated_number *cn = &r->v[ (rrdr_rows(r) - 1) * r->d ];
+            RRDR_VALUE_FLAGS *co = &r->o[ (rrdr_rows(r) - 1) * r->d ];
+            calculated_number n = cn[c];
+
+            if(co[c] & RRDR_VALUE_EMPTY) {
+                if(options & RRDR_OPTION_NULL2ZERO)
+                    buffer_strcat(wb, "0");
+                else
+                    buffer_strcat(wb, "null");
+            }
+            else {
+                if(unlikely((options & RRDR_OPTION_ABSOLUTE) && n < 0))
+                    n = -n;
+
+                if(unlikely(options & RRDR_OPTION_PERCENTAGE))
+                    n = n * 100 / total;
+
+                buffer_rrd_value(wb, n);
+            }
+        }
+    }
+    if(!i) {
+        rows = 0;
+        buffer_strcat(wb, "null");
+    }
+
+    buffer_sprintf(wb, "],\n"
+                       "   %sdimensions%s: %ld,\n"
+                       "   %spoints%s: %ld,\n"
+                       "   %sformat%s: %s"
+                   , kq, kq, i
+                   , kq, kq, rows
+                   , kq, kq, sq
+    );
+
+    rrdr_buffer_print_format(wb, format);
+
+    buffer_sprintf(wb, "%s,\n"
+                       "   %sresult%s: "
+                   , sq
+                   , kq, kq
+    );
+
+    if(string_value) buffer_strcat(wb, sq);
+    //info("JSONWRAPPER(): %s: END", r->st->id);
+}
+
+void rrdr_json_wrapper_end(RRDR *r, BUFFER *wb, uint32_t format, uint32_t options, int string_value) {
+    (void)format;
+
+    char kq[2] = "",                    // key quote
+            sq[2] = "";                     // string quote
+
+    if( options & RRDR_OPTION_GOOGLE_JSON ) {
+        kq[0] = '\0';
+        sq[0] = '\'';
+    }
+    else {
+        kq[0] = '"';
+        sq[0] = '"';
+    }
+
+    if(string_value) buffer_strcat(wb, sq);
+
+    buffer_sprintf(wb, ",\n %smin%s: ", kq, kq);
+    buffer_rrd_value(wb, r->min);
+    buffer_sprintf(wb, ",\n %smax%s: ", kq, kq);
+    buffer_rrd_value(wb, r->max);
+    buffer_strcat(wb, "\n}\n");
+}
diff --git a/web/api/formatters/json_wrapper.h b/web/api/formatters/json_wrapper.h
new file mode 100644
index 000000000..7cb7d3453
--- /dev/null
+++ b/web/api/formatters/json_wrapper.h
@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_API_FORMATTER_JSON_WRAPPER_H
+#define NETDATA_API_FORMATTER_JSON_WRAPPER_H
+
+#include "rrd2json.h"
+
+extern void rrdr_json_wrapper_begin(RRDR *r, BUFFER *wb, uint32_t format, RRDR_OPTIONS options, int string_value);
+extern void rrdr_json_wrapper_end(RRDR *r, BUFFER *wb, uint32_t format, uint32_t options, int string_value);
+
+#endif //NETDATA_API_FORMATTER_JSON_WRAPPER_H
diff --git a/web/api/formatters/rrd2json.c b/web/api/formatters/rrd2json.c
new file mode 100644
index 000000000..5cdcc80ff
--- /dev/null
+++ b/web/api/formatters/rrd2json.c
@@ -0,0 +1,298 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "web/api/web_api_v1.h"
+
+void rrd_stats_api_v1_chart(RRDSET *st, BUFFER *wb) {
+    rrdset2json(st, wb, NULL, NULL);
+}
+
+void rrdr_buffer_print_format(BUFFER *wb, uint32_t format)  {
+    switch(format) {
+        case DATASOURCE_JSON:
+            buffer_strcat(wb, DATASOURCE_FORMAT_JSON);
+            break;
+
+        case DATASOURCE_DATATABLE_JSON:
+            buffer_strcat(wb, DATASOURCE_FORMAT_DATATABLE_JSON);
+            break;
+
+        case DATASOURCE_DATATABLE_JSONP:
+            buffer_strcat(wb, DATASOURCE_FORMAT_DATATABLE_JSONP);
+            break;
+
+        case DATASOURCE_JSONP:
+            buffer_strcat(wb, DATASOURCE_FORMAT_JSONP);
+            break;
+
+        case DATASOURCE_SSV:
+            buffer_strcat(wb, DATASOURCE_FORMAT_SSV);
+            break;
+
+        case DATASOURCE_CSV:
+            buffer_strcat(wb, DATASOURCE_FORMAT_CSV);
+            break;
+
+        case DATASOURCE_TSV:
+            buffer_strcat(wb, DATASOURCE_FORMAT_TSV);
+            break;
+
+        case DATASOURCE_HTML:
+            buffer_strcat(wb, DATASOURCE_FORMAT_HTML);
+            break;
+
+        case DATASOURCE_JS_ARRAY:
+            buffer_strcat(wb, DATASOURCE_FORMAT_JS_ARRAY);
+            break;
+
+        case DATASOURCE_SSV_COMMA:
+            buffer_strcat(wb, DATASOURCE_FORMAT_SSV_COMMA);
+            break;
+
+        default:
+            buffer_strcat(wb, "unknown");
+            break;
+    }
+}
+
+int rrdset2value_api_v1(
+          RRDSET *st
+        , BUFFER *wb
+        , calculated_number *n
+        , const char *dimensions
+        , long points
+        , long long after
+        , long long before
+        , int group_method
+        , long group_time
+        , uint32_t options
+        , time_t *db_after
+        , time_t *db_before
+        , int *value_is_null
+) {
+    RRDR *r = rrd2rrdr(st, points, after, before, group_method, group_time, options, dimensions);
+    if(!r) {
+        if(value_is_null) *value_is_null = 1;
+        return 500;
+    }
+
+    if(rrdr_rows(r) == 0) {
+        rrdr_free(r);
+
+        if(db_after)  *db_after  = 0;
+        if(db_before) *db_before = 0;
+        if(value_is_null) *value_is_null = 1;
+
+        return 400;
+    }
+
+    if(wb) {
+        if (r->result_options & RRDR_RESULT_OPTION_RELATIVE)
+            buffer_no_cacheable(wb);
+        else if (r->result_options & RRDR_RESULT_OPTION_ABSOLUTE)
+            buffer_cacheable(wb);
+    }
+
+    if(db_after)  *db_after  = r->after;
+    if(db_before) *db_before = r->before;
+
+    long i = (!(options & RRDR_OPTION_REVERSED))?rrdr_rows(r) - 1:0;
+    *n = rrdr2value(r, i, options, value_is_null);
+
+    rrdr_free(r);
+    return 200;
+}
+
+int rrdset2anything_api_v1(
+          RRDSET *st
+        , BUFFER *wb
+        , BUFFER *dimensions
+        , uint32_t format
+        , long points
+        , long long after
+        , long long before
+        , int group_method
+        , long group_time
+        , uint32_t options
+        , time_t *latest_timestamp
+) {
+    st->last_accessed_time = now_realtime_sec();
+
+    RRDR *r = rrd2rrdr(st, points, after, before, group_method, group_time, options, dimensions?buffer_tostring(dimensions):NULL);
+    if(!r) {
+        buffer_strcat(wb, "Cannot generate output with these parameters on this chart.");
+        return 500;
+    }
+
+    if(r->result_options & RRDR_RESULT_OPTION_RELATIVE)
+        buffer_no_cacheable(wb);
+    else if(r->result_options & RRDR_RESULT_OPTION_ABSOLUTE)
+        buffer_cacheable(wb);
+
+    if(latest_timestamp && rrdr_rows(r) > 0)
+        *latest_timestamp = r->before;
+
+    switch(format) {
+    case DATASOURCE_SSV:
+        if(options & RRDR_OPTION_JSON_WRAP) {
+            wb->contenttype = CT_APPLICATION_JSON;
+            rrdr_json_wrapper_begin(r, wb, format, options, 1);
+            rrdr2ssv(r, wb, options, "", " ", "");
+            rrdr_json_wrapper_end(r, wb, format, options, 1);
+        }
+        else {
+            wb->contenttype = CT_TEXT_PLAIN;
+            rrdr2ssv(r, wb, options, "", " ", "");
+        }
+        break;
+
+    case DATASOURCE_SSV_COMMA:
+        if(options & RRDR_OPTION_JSON_WRAP) {
+            wb->contenttype = CT_APPLICATION_JSON;
+            rrdr_json_wrapper_begin(r, wb, format, options, 1);
+            rrdr2ssv(r, wb, options, "", ",", "");
+            rrdr_json_wrapper_end(r, wb, format, options, 1);
+        }
+        else {
+            wb->contenttype = CT_TEXT_PLAIN;
+            rrdr2ssv(r, wb, options, "", ",", "");
+        }
+        break;
+
+    case DATASOURCE_JS_ARRAY:
+        if(options & RRDR_OPTION_JSON_WRAP) {
+            wb->contenttype = CT_APPLICATION_JSON;
+            rrdr_json_wrapper_begin(r, wb, format, options, 0);
+            rrdr2ssv(r, wb, options, "[", ",", "]");
+            rrdr_json_wrapper_end(r, wb, format, options, 0);
+        }
+        else {
+            wb->contenttype = CT_APPLICATION_JSON;
+            rrdr2ssv(r, wb, options, "[", ",", "]");
+        }
+        break;
+
+    case DATASOURCE_CSV:
+        if(options & RRDR_OPTION_JSON_WRAP) {
+            wb->contenttype = CT_APPLICATION_JSON;
+            rrdr_json_wrapper_begin(r, wb, format, options, 1);
+            rrdr2csv(r, wb, format, options, "", ",", "\\n", "");
+            rrdr_json_wrapper_end(r, wb, format, options, 1);
+        }
+        else {
+            wb->contenttype = CT_TEXT_PLAIN;
+            rrdr2csv(r, wb, format, options, "", ",", "\r\n", "");
+        }
+        break;
+
+    case DATASOURCE_CSV_MARKDOWN:
+        if(options & RRDR_OPTION_JSON_WRAP) {
+            wb->contenttype = CT_APPLICATION_JSON;
+            rrdr_json_wrapper_begin(r, wb, format, options, 1);
+            rrdr2csv(r, wb, format, options, "", "|", "\\n", "");
+            rrdr_json_wrapper_end(r, wb, format, options, 1);
+        }
+        else {
+            wb->contenttype = CT_TEXT_PLAIN;
+            rrdr2csv(r, wb, format, options, "", "|", "\r\n", "");
+        }
+        break;
+
+    case DATASOURCE_CSV_JSON_ARRAY:
+        wb->contenttype = CT_APPLICATION_JSON;
+        if(options & RRDR_OPTION_JSON_WRAP) {
+            rrdr_json_wrapper_begin(r, wb, format, options, 0);
+            buffer_strcat(wb, "[\n");
+            rrdr2csv(r, wb, format, options + RRDR_OPTION_LABEL_QUOTES, "[", ",", "]", ",\n");
+            buffer_strcat(wb, "\n]");
+            rrdr_json_wrapper_end(r, wb, format, options, 0);
+        }
+        else {
+            wb->contenttype = CT_APPLICATION_JSON;
+            buffer_strcat(wb, "[\n");
+            rrdr2csv(r, wb, format, options + RRDR_OPTION_LABEL_QUOTES, "[", ",", "]", ",\n");
+            buffer_strcat(wb, "\n]");
+        }
+        break;
+
+    case DATASOURCE_TSV:
+        if(options & RRDR_OPTION_JSON_WRAP) {
+            wb->contenttype = CT_APPLICATION_JSON;
+            rrdr_json_wrapper_begin(r, wb, format, options, 1);
+            rrdr2csv(r, wb, format, options, "", "\t", "\\n", "");
+            rrdr_json_wrapper_end(r, wb, format, options, 1);
+        }
+        else {
+            wb->contenttype = CT_TEXT_PLAIN;
+            rrdr2csv(r, wb, format, options, "", "\t", "\r\n", "");
+        }
+        break;
+
+    case DATASOURCE_HTML:
+        if(options & RRDR_OPTION_JSON_WRAP) {
+            wb->contenttype = CT_APPLICATION_JSON;
+            rrdr_json_wrapper_begin(r, wb, format, options, 1);
+            buffer_strcat(wb, "<html>\\n<center>\\n<table border=\\\"0\\\" cellpadding=\\\"5\\\" cellspacing=\\\"5\\\">\\n");
+            rrdr2csv(r, wb, format, options, "<tr><td>", "</td><td>", "</td></tr>\\n", "");
+            buffer_strcat(wb, "</table>\\n</center>\\n</html>\\n");
+            rrdr_json_wrapper_end(r, wb, format, options, 1);
+        }
+        else {
+            wb->contenttype = CT_TEXT_HTML;
+            buffer_strcat(wb, "<html>\n<center>\n<table border=\"0\" cellpadding=\"5\" cellspacing=\"5\">\n");
+            rrdr2csv(r, wb, format, options, "<tr><td>", "</td><td>", "</td></tr>\n", "");
+            buffer_strcat(wb, "</table>\n</center>\n</html>\n");
+        }
+        break;
+
+    case DATASOURCE_DATATABLE_JSONP:
+        wb->contenttype = CT_APPLICATION_X_JAVASCRIPT;
+
+        if(options & RRDR_OPTION_JSON_WRAP)
+            rrdr_json_wrapper_begin(r, wb, format, options, 0);
+
+        rrdr2json(r, wb, options, 1);
+
+        if(options & RRDR_OPTION_JSON_WRAP)
+            rrdr_json_wrapper_end(r, wb, format, options, 0);
+        break;
+
+    case DATASOURCE_DATATABLE_JSON:
+        wb->contenttype = CT_APPLICATION_JSON;
+
+        if(options & RRDR_OPTION_JSON_WRAP)
+            rrdr_json_wrapper_begin(r, wb, format, options, 0);
+
+        rrdr2json(r, wb, options, 1);
+
+        if(options & RRDR_OPTION_JSON_WRAP)
+            rrdr_json_wrapper_end(r, wb, format, options, 0);
+        break;
+
+    case DATASOURCE_JSONP:
+        wb->contenttype = CT_APPLICATION_X_JAVASCRIPT;
+        if(options & RRDR_OPTION_JSON_WRAP)
+            rrdr_json_wrapper_begin(r, wb, format, options, 0);
+
+        rrdr2json(r, wb, options, 0);
+
+        if(options & RRDR_OPTION_JSON_WRAP)
+            rrdr_json_wrapper_end(r, wb, format, options, 0);
+        break;
+
+    case DATASOURCE_JSON:
+    default:
+        wb->contenttype = CT_APPLICATION_JSON;
+
+        if(options & RRDR_OPTION_JSON_WRAP)
+            rrdr_json_wrapper_begin(r, wb, format, options, 0);
+
+        rrdr2json(r, wb, options, 0);
+
+        if(options & RRDR_OPTION_JSON_WRAP)
+            rrdr_json_wrapper_end(r, wb, format, options, 0);
+        break;
+    }
+
+    rrdr_free(r);
+    return 200;
+}
diff --git a/web/api/formatters/rrd2json.h b/web/api/formatters/rrd2json.h
new file mode 100644
index 000000000..bac6130de
--- /dev/null
+++ b/web/api/formatters/rrd2json.h
@@ -0,0 +1,84 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_RRD2JSON_H
+#define NETDATA_RRD2JSON_H 1
+
+#include "web/api/web_api_v1.h"
+#include "web/api/exporters/allmetrics.h"
+#include "web/api/queries/rrdr.h"
+
+#include "web/api/formatters/csv/csv.h"
+#include "web/api/formatters/ssv/ssv.h"
+#include "web/api/formatters/json/json.h"
+#include "web/api/formatters/value/value.h"
+
+#include "web/api/formatters/rrdset2json.h"
+#include "web/api/formatters/charts2json.h"
+#include "web/api/formatters/json_wrapper.h"
+
+#define HOSTNAME_MAX 1024
+
+#define API_RELATIVE_TIME_MAX (3 * 365 * 86400)
+
+// type of JSON generations
+#define DATASOURCE_INVALID (-1)
+#define DATASOURCE_JSON 0
+#define DATASOURCE_DATATABLE_JSON 1
+#define DATASOURCE_DATATABLE_JSONP 2
+#define DATASOURCE_SSV 3
+#define DATASOURCE_CSV 4
+#define DATASOURCE_JSONP 5
+#define DATASOURCE_TSV 6
+#define DATASOURCE_HTML 7
+#define DATASOURCE_JS_ARRAY 8
+#define DATASOURCE_SSV_COMMA 9
+#define DATASOURCE_CSV_JSON_ARRAY 10
+#define DATASOURCE_CSV_MARKDOWN 11
+
+#define DATASOURCE_FORMAT_JSON "json"
+#define DATASOURCE_FORMAT_DATATABLE_JSON "datatable"
+#define DATASOURCE_FORMAT_DATATABLE_JSONP "datasource"
+#define DATASOURCE_FORMAT_JSONP "jsonp"
+#define DATASOURCE_FORMAT_SSV "ssv"
+#define DATASOURCE_FORMAT_CSV "csv"
+#define DATASOURCE_FORMAT_TSV "tsv"
+#define DATASOURCE_FORMAT_HTML "html"
+#define DATASOURCE_FORMAT_JS_ARRAY "array"
+#define DATASOURCE_FORMAT_SSV_COMMA "ssvcomma"
+#define DATASOURCE_FORMAT_CSV_JSON_ARRAY "csvjsonarray"
+#define DATASOURCE_FORMAT_CSV_MARKDOWN "markdown"
+
+extern void rrd_stats_api_v1_chart(RRDSET *st, BUFFER *wb);
+extern void rrdr_buffer_print_format(BUFFER *wb, uint32_t format);
+
+extern int rrdset2anything_api_v1(
+          RRDSET *st
+        , BUFFER *wb
+        , BUFFER *dimensions
+        , uint32_t format
+        , long points
+        , long long after
+        , long long before
+        , int group_method
+        , long group_time
+        , uint32_t options
+        , time_t *latest_timestamp
+);
+
+extern int rrdset2value_api_v1(
+          RRDSET *st
+        , BUFFER *wb
+        , calculated_number *n
+        , const char *dimensions
+        , long points
+        , long long after
+        , long long before
+        , int group_method
+        , long group_time
+        , uint32_t options
+        , time_t *db_after
+        , time_t *db_before
+        , int *value_is_null
+);
+
+#endif /* NETDATA_RRD2JSON_H */
diff --git a/web/api/formatters/rrdset2json.c b/web/api/formatters/rrdset2json.c
new file mode 100644
index 000000000..6d57e34cf
--- /dev/null
+++ b/web/api/formatters/rrdset2json.c
@@ -0,0 +1,108 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "rrdset2json.h"
+
+// generate JSON for the /api/v1/chart API call
+
+void rrdset2json(RRDSET *st, BUFFER *wb, size_t *dimensions_count, size_t *memory_used) {
+    rrdset_rdlock(st);
+
+    buffer_sprintf(wb,
+            "\t\t{\n"
+            "\t\t\t\"id\": \"%s\",\n"
+            "\t\t\t\"name\": \"%s\",\n"
+            "\t\t\t\"type\": \"%s\",\n"
+            "\t\t\t\"family\": \"%s\",\n"
+            "\t\t\t\"context\": \"%s\",\n"
+            "\t\t\t\"title\": \"%s (%s)\",\n"
+            "\t\t\t\"priority\": %ld,\n"
+            "\t\t\t\"plugin\": \"%s\",\n"
+            "\t\t\t\"module\": \"%s\",\n"
+            "\t\t\t\"enabled\": %s,\n"
+            "\t\t\t\"units\": \"%s\",\n"
+            "\t\t\t\"data_url\": \"/api/v1/data?chart=%s\",\n"
+            "\t\t\t\"chart_type\": \"%s\",\n"
+            "\t\t\t\"duration\": %ld,\n"
+            "\t\t\t\"first_entry\": %ld,\n"
+            "\t\t\t\"last_entry\": %ld,\n"
+            "\t\t\t\"update_every\": %d,\n"
+            "\t\t\t\"dimensions\": {\n"
+                   , st->id
+                   , st->name
+                   , st->type
+                   , st->family
+                   , st->context
+                   , st->title, st->name
+                   , st->priority
+                   , st->plugin_name?st->plugin_name:""
+                   , st->module_name?st->module_name:""
+                   , rrdset_flag_check(st, RRDSET_FLAG_ENABLED)?"true":"false"
+                   , st->units
+                   , st->name
+                   , rrdset_type_name(st->chart_type)
+                   , st->entries * st->update_every
+                   , rrdset_first_entry_t(st)
+                   , rrdset_last_entry_t(st)
+                   , st->update_every
+    );
+
+    unsigned long memory = st->memsize;
+
+    size_t dimensions = 0;
+    RRDDIM *rd;
+    rrddim_foreach_read(rd, st) {
+        if(rrddim_flag_check(rd, RRDDIM_FLAG_HIDDEN)) continue;
+
+        memory += rd->memsize;
+
+        buffer_sprintf(
+                wb
+                , "%s"
+                  "\t\t\t\t\"%s\": { \"name\": \"%s\" }"
+                , dimensions ? ",\n" : ""
+                , rd->id
+                , rd->name
+        );
+
+        dimensions++;
+    }
+
+    if(dimensions_count) *dimensions_count += dimensions;
+    if(memory_used) *memory_used += memory;
+
+    buffer_strcat(wb, "\n\t\t\t},\n\t\t\t\"green\": ");
+    buffer_rrd_value(wb, st->green);
+    buffer_strcat(wb, ",\n\t\t\t\"red\": ");
+    buffer_rrd_value(wb, st->red);
+
+    buffer_strcat(wb, ",\n\t\t\t\"alarms\": {\n");
+    size_t alarms = 0;
+    RRDCALC *rc;
+    for(rc = st->alarms; rc ; rc = rc->rrdset_next) {
+
+        buffer_sprintf(
+                wb
+                , "%s"
+                  "\t\t\t\t\"%s\": {\n"
+                  "\t\t\t\t\t\"id\": %u,\n"
+                  "\t\t\t\t\t\"status\": \"%s\",\n"
+                  "\t\t\t\t\t\"units\": \"%s\",\n"
+                  "\t\t\t\t\t\"update_every\": %d\n"
+                  "\t\t\t\t}"
+                , (alarms) ? ",\n" : ""
+                , rc->name
+                , rc->id
+                , rrdcalc_status2string(rc->status)
+                , rc->units
+                , rc->update_every
+        );
+
+        alarms++;
+    }
+
+    buffer_sprintf(wb,
+            "\n\t\t\t}\n\t\t}"
+    );
+
+    rrdset_unlock(st);
+}
diff --git a/web/api/formatters/rrdset2json.h b/web/api/formatters/rrdset2json.h
new file mode 100644
index 000000000..b2669ec0a
--- /dev/null
+++ b/web/api/formatters/rrdset2json.h
@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_API_FORMATTER_RRDSET2JSON_H
+#define NETDATA_API_FORMATTER_RRDSET2JSON_H
+
+#include "rrd2json.h"
+
+extern void rrdset2json(RRDSET *st, BUFFER *wb, size_t *dimensions_count, size_t *memory_used);
+
+#endif //NETDATA_API_FORMATTER_RRDSET2JSON_H
diff --git a/web/api/formatters/ssv/Makefile.am b/web/api/formatters/ssv/Makefile.am
new file mode 100644
index 000000000..19554bed8
--- /dev/null
+++ b/web/api/formatters/ssv/Makefile.am
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+AUTOMAKE_OPTIONS = subdir-objects
+MAINTAINERCLEANFILES = $(srcdir)/Makefile.in
+
+dist_noinst_DATA = \
+	README.md \
+	$(NULL)
diff --git a/web/api/formatters/ssv/Makefile.in b/web/api/formatters/ssv/Makefile.in
new file mode 100644
index 000000000..c7c8c3fa9
--- /dev/null
+++ b/web/api/formatters/ssv/Makefile.in
@@ -0,0 +1,464 @@
+# Makefile.in generated by automake 1.14.1 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2013 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+# SPDX-License-Identifier: GPL-3.0-or-later
+
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+  strip_trailopt () \
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diff --git a/web/api/formatters/ssv/README.md b/web/api/formatters/ssv/README.md
new file mode 100644
index 000000000..74f0d3189
--- /dev/null
+++ b/web/api/formatters/ssv/README.md
@@ -0,0 +1,52 @@
+# SSV formatter
+
+The SSV formatter sums all dimensions in [results of database queries](../../queries)
+to a single value and returns a list of such values showing how it changes through time.
+
+It supports the following formats:
+
+format|content type|description
+:---:|:---:|:-----
+`ssv`|text/plain|a space separated list of values
+`ssvcomma`|text/plain|a comma separated list of values
+`array`|application/json|a JSON array
+
+The CSV formatter respects the following API `&options=`:
+
+option|supported|description
+:---:|:---:|:---
+`nonzero`|yes|to return only the dimensions that have at least a non-zero value
+`flip`|yes|to return the numbers older to newer (the default is newer to older)
+`percent`|yes|to replace all values with their percentage over the row total
+`abs`|yes|to turn all values positive, before using them
+`min2max`|yes|to return the delta from the minimum value to the maximum value (across dimensions)
+
+## Examples
+
+Get the average system CPU utilization of the last hour, in 6 values (one every 10 minutes):
+
+```bash
+# curl -Ss 'https://registry.my-netdata.io/api/v1/data?chart=system.cpu&format=ssv&after=-3600&points=6&group=average'
+1.741352 1.6800467 1.769411 1.6761112 1.629862 1.6807968
+```
+
+---
+
+Get the total mysql bandwidth (in + out) for the last hour, in 6 values (one every 10 minutes):
+
+Netdata returns bandwidth in `kilobits`.
+
+```bash
+# curl -Ss 'https://registry.my-netdata.io/api/v1/data?chart=mysql_local.net&format=ssvcomma&after=-3600&points=6&group=sum&options=abs'
+72618.7936215,72618.778889,72618.788084,72618.9195918,72618.7760612,72618.6712421
+```
+
+---
+
+Get the web server max connections for the last hour, in 12 values (one every 5 minutes)
+in a JSON array:
+
+```bash
+# curl -Ss 'https://registry.my-netdata.io/api/v1/data?chart=nginx_local.connections&format=array&after=-3600&points=12&group=max'
+[278,258,268,239,259,260,243,266,278,318,264,258]
+```
diff --git a/web/api/formatters/ssv/ssv.c b/web/api/formatters/ssv/ssv.c
new file mode 100644
index 000000000..eeba0283d
--- /dev/null
+++ b/web/api/formatters/ssv/ssv.c
@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "ssv.h"
+
+void rrdr2ssv(RRDR *r, BUFFER *wb, RRDR_OPTIONS options, const char *prefix, const char *separator, const char *suffix) {
+    //info("RRD2SSV(): %s: BEGIN", r->st->id);
+    long i;
+
+    buffer_strcat(wb, prefix);
+    long start = 0, end = rrdr_rows(r), step = 1;
+    if(!(options & RRDR_OPTION_REVERSED)) {
+        start = rrdr_rows(r) - 1;
+        end = -1;
+        step = -1;
+    }
+
+    // for each line in the array
+    for(i = start; i != end ;i += step) {
+        int all_values_are_null = 0;
+        calculated_number v = rrdr2value(r, i, options, &all_values_are_null);
+
+        if(likely(i != start)) {
+            if(r->min > v) r->min = v;
+            if(r->max < v) r->max = v;
+        }
+        else {
+            r->min = v;
+            r->max = v;
+        }
+
+        if(likely(i != start))
+            buffer_strcat(wb, separator);
+
+        if(all_values_are_null) {
+            if(options & RRDR_OPTION_NULL2ZERO)
+                buffer_strcat(wb, "0");
+            else
+                buffer_strcat(wb, "null");
+        }
+        else
+            buffer_rrd_value(wb, v);
+    }
+    buffer_strcat(wb, suffix);
+    //info("RRD2SSV(): %s: END", r->st->id);
+}
diff --git a/web/api/formatters/ssv/ssv.h b/web/api/formatters/ssv/ssv.h
new file mode 100644
index 000000000..6963dcf6e
--- /dev/null
+++ b/web/api/formatters/ssv/ssv.h
@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_API_FORMATTER_SSV_H
+#define NETDATA_API_FORMATTER_SSV_H
+
+#include "../rrd2json.h"
+
+extern void rrdr2ssv(RRDR *r, BUFFER *wb, RRDR_OPTIONS options, const char *prefix, const char *separator, const char *suffix);
+
+#endif //NETDATA_API_FORMATTER_SSV_H
diff --git a/web/api/formatters/value/Makefile.am b/web/api/formatters/value/Makefile.am
new file mode 100644
index 000000000..19554bed8
--- /dev/null
+++ b/web/api/formatters/value/Makefile.am
@@ -0,0 +1,8 @@
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new file mode 100644
index 000000000..eb0b2bddf
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+AUTOMAKE_OPTIONS = subdir-objects
+MAINTAINERCLEANFILES = $(srcdir)/Makefile.in
+dist_noinst_DATA = \
+	README.md \
+	$(NULL)
+
+all: all-am
+
+.SUFFIXES:
+$(srcdir)/Makefile.in: @MAINTAINER_MODE_TRUE@ $(srcdir)/Makefile.am  $(am__configure_deps)
+	@for dep in $?; do \
+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
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+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --gnu web/api/formatters/value/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --gnu web/api/formatters/value/Makefile
+.PRECIOUS: Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+	@case '$?' in \
+	  *config.status*) \
+	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
+	  *) \
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+	esac;
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+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
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+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
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+
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+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
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+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
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diff --git a/web/api/formatters/value/README.md b/web/api/formatters/value/README.md
new file mode 100644
index 000000000..5024e74ee
--- /dev/null
+++ b/web/api/formatters/value/README.md
@@ -0,0 +1,17 @@
+# Value formatter
+
+The Value formatter presents [results of database queries](../../queries) as a single value.
+
+To calculate the single value to be returned, it sums the values of all dimensions.
+
+The Value formatter respects the following API `&options=`:
+
+option|supported|description
+:---:|:---:|:---
+`percent`|yes|to replace all values with their percentage over the row total
+`abs`|yes|to turn all values positive, before using them
+`min2max`|yes|to return the delta from the minimum value to the maximum value (across dimensions)
+
+The Value formatter is not exposed by the API by itself.
+Instead it is used by the [`ssv`](../ssv) formatter
+and [health monitoring queries](../../../../health).
diff --git a/web/api/formatters/value/value.c b/web/api/formatters/value/value.c
new file mode 100644
index 000000000..aea6c162b
--- /dev/null
+++ b/web/api/formatters/value/value.c
@@ -0,0 +1,94 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "value.h"
+
+
+inline calculated_number rrdr2value(RRDR *r, long i, RRDR_OPTIONS options, int *all_values_are_null) {
+    rrdset_check_rdlock(r->st);
+
+    long c;
+    RRDDIM *d;
+
+    calculated_number *cn = &r->v[ i * r->d ];
+    RRDR_VALUE_FLAGS *co = &r->o[ i * r->d ];
+
+    calculated_number sum = 0, min = 0, max = 0, v;
+    int all_null = 1, init = 1;
+
+    calculated_number total = 1;
+    int set_min_max = 0;
+    if(unlikely(options & RRDR_OPTION_PERCENTAGE)) {
+        total = 0;
+        for(c = 0, d = r->st->dimensions; d && c < r->d ;c++, d = d->next) {
+            calculated_number n = cn[c];
+
+            if(likely((options & RRDR_OPTION_ABSOLUTE) && n < 0))
+                n = -n;
+
+            total += n;
+        }
+        // prevent a division by zero
+        if(total == 0) total = 1;
+        set_min_max = 1;
+    }
+
+    // for each dimension
+    for(c = 0, d = r->st->dimensions; d && c < r->d ;c++, d = d->next) {
+        if(unlikely(r->od[c] & RRDR_DIMENSION_HIDDEN)) continue;
+        if(unlikely((options & RRDR_OPTION_NONZERO) && !(r->od[c] & RRDR_DIMENSION_NONZERO))) continue;
+
+        calculated_number n = cn[c];
+
+        if(likely((options & RRDR_OPTION_ABSOLUTE) && n < 0))
+            n = -n;
+
+        if(unlikely(options & RRDR_OPTION_PERCENTAGE)) {
+            n = n * 100 / total;
+
+            if(unlikely(set_min_max)) {
+                r->min = r->max = n;
+                set_min_max = 0;
+            }
+
+            if(n < r->min) r->min = n;
+            if(n > r->max) r->max = n;
+        }
+
+        if(unlikely(init)) {
+            if(n > 0) {
+                min = 0;
+                max = n;
+            }
+            else {
+                min = n;
+                max = 0;
+            }
+            init = 0;
+        }
+
+        if(likely(!(co[c] & RRDR_VALUE_EMPTY))) {
+            all_null = 0;
+            sum += n;
+        }
+
+        if(n < min) min = n;
+        if(n > max) max = n;
+    }
+
+    if(unlikely(all_null)) {
+        if(likely(all_values_are_null))
+            *all_values_are_null = 1;
+        return 0;
+    }
+    else {
+        if(likely(all_values_are_null))
+            *all_values_are_null = 0;
+    }
+
+    if(options & RRDR_OPTION_MIN2MAX)
+        v = max - min;
+    else
+        v = sum;
+
+    return v;
+}
diff --git a/web/api/formatters/value/value.h b/web/api/formatters/value/value.h
new file mode 100644
index 000000000..d9e981f88
--- /dev/null
+++ b/web/api/formatters/value/value.h
@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_API_FORMATTER_VALUE_H
+#define NETDATA_API_FORMATTER_VALUE_H
+
+#include "../rrd2json.h"
+
+extern calculated_number rrdr2value(RRDR *r, long i, RRDR_OPTIONS options, int *all_values_are_null);
+
+#endif //NETDATA_API_FORMATTER_VALUE_H
diff --git a/web/netdata-swagger.json b/web/api/netdata-swagger.json
index 768b6fd38..8ee1a8a72 100644
--- a/web/netdata-swagger.json
+++ b/web/api/netdata-swagger.json
@@ -2,11 +2,12 @@
   "swagger": "2.0",
   "info": {
     "title": "NetData API",
-    "description": "Real time data collection and graphs...",
+    "description": "Real-time performance and health monitoring.",
     "version": "1.9.11_rolling"
   },
   "host": "registry.my-netdata.io",
   "schemes": [
+    "https",
     "http"
   ],
   "basePath": "/api/v1",
@@ -126,6 +127,8 @@
               "min",
               "max",
               "average",
+              "median",
+              "stddev",
               "sum",
               "incremental-sum"
             ],
@@ -159,6 +162,7 @@
               "datatable",
               "datasource",
               "html",
+              "markdown",
               "array",
               "csvjsonarray"
             ],
@@ -309,6 +313,8 @@
               "min",
               "max",
               "average",
+              "median",
+              "stddev",
               "sum",
               "incremental-sum"
             ],
diff --git a/web/netdata-swagger.yaml b/web/api/netdata-swagger.yaml
index a8abe1abf..58f19198f 100644
--- a/web/netdata-swagger.yaml
+++ b/web/api/netdata-swagger.yaml
@@ -1,10 +1,12 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
 swagger: '2.0'
 info:
   title: NetData API
-  description: 'Real time data collection and graphs...'
-  version: 1.9.11_rolling
+  description: 'Real-time performance and health monitoring.'
+  version: 1.11.0_rolling
 host: registry.my-netdata.io
 schemes:
+  - https
   - http
 basePath: /api/v1
 produces:
@@ -92,7 +94,7 @@ paths:
           description: 'The grouping method. If multiple collected values are to be grouped in order to return fewer points, this parameters defines the method of grouping. methods supported "min", "max", "average", "sum", "incremental-sum". "max" is actually calculated on the absolute value collected (so it works for both positive and negative dimesions to return the most extreme value in either direction).'
           required: true
           type: string
-          enum: [ 'min', 'max', 'average', 'sum', 'incremental-sum' ]
+          enum: [ 'min', 'max', 'average', 'median', 'stddev', 'sum', 'incremental-sum' ]
           default: 'average'
           allowEmptyValue: false
         - name: gtime
@@ -108,7 +110,7 @@ paths:
           description: 'The format of the data to be returned.'
           required: true
           type: string
-          enum: [ 'json', 'jsonp', 'csv', 'tsv', 'tsv-excel', 'ssv', 'ssvcomma', 'datatable', 'datasource', 'html', 'array', 'csvjsonarray' ]
+          enum: [ 'json', 'jsonp', 'csv', 'tsv', 'tsv-excel', 'ssv', 'ssvcomma', 'datatable', 'datasource', 'html', 'markdown', 'array', 'csvjsonarray' ]
           default: json
           allowEmptyValue: false
         - name: options
@@ -202,7 +204,7 @@ paths:
           description: 'The grouping method. If multiple collected values are to be grouped in order to return fewer points, this parameters defines the method of grouping. methods are supported "min", "max", "average", "sum", "incremental-sum". "max" is actually calculated on the absolute value collected (so it works for both positive and negative dimesions to return the most extreme value in either direction).'
           required: true
           type: string
-          enum: [ 'min', 'max', 'average', 'sum', 'incremental-sum' ]
+          enum: [ 'min', 'max', 'average', 'median', 'stddev', 'sum', 'incremental-sum' ]
           default: 'average'
           allowEmptyValue: false
         - name: options
diff --git a/web/api/queries/Makefile.am b/web/api/queries/Makefile.am
new file mode 100644
index 000000000..008dbfeb8
--- /dev/null
+++ b/web/api/queries/Makefile.am
@@ -0,0 +1,20 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+AUTOMAKE_OPTIONS = subdir-objects
+MAINTAINERCLEANFILES = $(srcdir)/Makefile.in
+
+SUBDIRS = \
+    average \
+    des \
+    incremental_sum \
+    max \
+    min \
+    sum \
+    median \
+    ses \
+    stddev \
+    $(NULL)
+
+dist_noinst_DATA = \
+	README.md \
+	$(NULL)
diff --git a/web/api/queries/Makefile.in b/web/api/queries/Makefile.in
new file mode 100644
index 000000000..295870d2c
--- /dev/null
+++ b/web/api/queries/Makefile.in
@@ -0,0 +1,656 @@
+# Makefile.in generated by automake 1.14.1 from Makefile.am.
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+
+# Copyright (C) 1994-2013 Free Software Foundation, Inc.
+
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+# with or without modifications, as long as this notice is preserved.
+
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diff --git a/web/api/queries/README.md b/web/api/queries/README.md
new file mode 100644
index 000000000..7a517d26e
--- /dev/null
+++ b/web/api/queries/README.md
@@ -0,0 +1,128 @@
+# Database Queries
+
+Netdata database can be queried with `/api/v1/data` and `/api/v1/badge.svg` REST API methods.
+
+Every data query accepts the following parameters:
+
+name|required|description
+:----:|:----:|:---
+`chart`|yes|The chart to be queried.
+`points`|no|The number of points to be returned. Netdata can reduce number of points by applying query grouping methods. If not given, the result will have the same granularity as the database (although this relates to `gtime`).
+`before`|no|The absolute timestamp or the relative (to now) time the query should finish evaluating data. If not given, it defaults to the timestamp of the latest point in the database.
+`after`|no|The absolute timestamp or the relative (to `before`) time the query should start evaluating data. if not given, it defaults to the timestamp of the oldest point in the database.
+`group`|no|The grouping method to use when reducing the points the database has. If not given, it defaults to `average`.
+`gtime`|no|A resampling period to change the units of the metrics (i.e. setting this to `60` will convert `per second` metrics to `per minute`. If not given it defaults to granularity of the database.
+`options`|no|A bitmap of options that can affect the operation of the query. Only 2 options are used by the query engine: `unaligned` and `percentage`. All the other options are used by the output formatters. The default is to return aligned data.
+`dimensions`|no|A simple pattern to filter the dimensions to be queried. The default is to return all the dimensions of the chart.
+
+## Operation
+
+The query engine works as follows (in this order):
+
+#### Time-frame
+
+`after` and `before` define a time-frame, accepting:
+
+- **absolute timestamps** (unix timestamps, i.e. seconds since epoch).
+
+- **relative timestamps**:
+
+  `before` is relative to now and `after` is relative to `before`.
+  
+  Example: `before=-60&after=-60` evaluates to the time-frame from -120 up to -60 seconds in
+  the past, relative to the latest entry of the database of the chart. 
+
+The engine verifies that the time-frame requested is available at the database:
+
+- If the requested time-frame overlaps with the database, the excess requested
+   will be truncated.
+   
+- If the requested time-frame does not overlap with the database, the engine will
+   return an empty data set.
+
+At the end of this operation, `after` and `before` are absolute timestamps.
+
+#### Data grouping
+
+Database points grouping is applied when the caller requests a time-frame to be
+expressed with fewer points, compared to what is available at the database.
+
+There are 2 uses that enable this feature:
+
+- The caller requests a specific number of `points` to be returned.
+  
+  For example, for a time-frame of 10 minutes, the database has 600 points (1/sec),
+  while the caller requested these 10 minutes to be expressed in 200 points.
+  
+  This feature is used by netdata dashboards when you zoom-out the charts.
+  The dashboard is requesting the number of points the user's screen has.
+  This saves bandwidth and speeds up the browser (fewer points to evaluate for drawing the charts).
+  
+- The caller requests a **re-sampling** of the database, by setting `gtime` to any value
+  above the granularity of the chart.
+  
+  For example, the chart's units is `requests/sec` and caller wants `requests/min`.
+  
+Using `points` and `gtime` the query engine tries to find a best fit for **database-points**
+vs **result-points** (we call this ratio `group points`). It always tries to keep `group points`
+an integer. Keep in mind the query engine may shift `after` if required.
+
+#### Time-frame Alignment
+
+Alignment is a very important aspect of netdata queries. Without it, the animated
+charts on the dashboards would constantly change shape during incremental updates.
+
+To provide consistent grouping through time, the query engine (by default) aligns
+`after` and `before` to be a multiple of `group points`.
+
+For example, if `group points` is 60 and alignment is enabled, the engine will return
+each point with durations XX:XX:00 - XX:XX:59, matching whole minutes.
+
+To disable alignment, pass `&options=unaligned` to the query.
+   
+#### Query Execution
+
+To execute the query, the engine evaluates all dimensions of the chart, one after another.
+
+The engine does not evaluate dimensions that do not match the [simple pattern](../../../libnetdata/simple_pattern)
+given at the `dimensions` parameter, except when `options=percentage` is given (this option
+requires all the dimensions to be evaluated to find the percentage of each dimension vs to chart
+total).
+
+For each dimension, it starts evaluating values starting at `after` (not inclusive) towards
+`before` (inclusive).
+
+For each value it calls the **grouping method** given with the `&group=` query parameter
+(the default is `average`).
+
+## Grouping methods
+
+The following grouping methods are supported. These are given all the values in the time-frame
+and they group the values every `group points`.
+
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=min&after=-60&label=min&value_color=blue) finds the minimum value
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=max&after=-60&label=max&value_color=lightblue) finds the maximum value
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=average&after=-60&label=average&value_color=yellow) finds the average value
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=sum&after=-60&label=sum&units=requests&value_color=orange) adds all the values and returns the sum
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=median&after=-60&label=median&value_color=red) sorts the values and returns the value in the middle of the list
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=stddev&after=-60&label=stddev&value_color=green) finds the standard deviation of the values
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=cv&after=-60&label=cv&units=pcent&value_color=yellow) finds the relative standard deviation (coefficient of variation) of the values
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=ses&after=-60&label=ses&value_color=brown) finds the exponential weighted moving average of the values
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=des&after=-60&label=des&value_color=blue) applies Holt-Winters double exponential smoothing
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=incremental_sum&after=-60&label=incremental_sum&value_color=red) finds the difference of the last vs the first value
+
+The examples shown above, are live information from the `successful` web requests of the global netdata registry.
+
+## Further processing
+
+The result of the query engine is always a structure that has dimensions and values
+for each dimension.
+
+Formatting modules are then used to convert this result in many different formats and return it
+to the caller.
+
+## Performance
+
+The query engine is highly optimized for speed. Most of its modules implement "online"
+versions of the algorithms, requiring just one pass on the database values to produce
+the result.
diff --git a/web/api/queries/average/Makefile.am b/web/api/queries/average/Makefile.am
new file mode 100644
index 000000000..19554bed8
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diff --git a/web/api/queries/average/Makefile.in b/web/api/queries/average/Makefile.in
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index 000000000..a5db03648
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diff --git a/web/api/queries/average/README.md b/web/api/queries/average/README.md
new file mode 100644
index 000000000..3be434f68
--- /dev/null
+++ b/web/api/queries/average/README.md
@@ -0,0 +1,39 @@
+# Average or Mean
+
+> This query is available as `average` and `mean`.
+
+An average is a single number taken as representative of a list of numbers.
+
+It is calculated as:
+
+```
+average = sum(numbers) / count(numbers)
+```
+
+## how to use
+
+Use it in alarms like this:
+
+```
+ alarm: my_alarm
+    on: my_chart
+lookup: average -1m unaligned of my_dimension
+  warn: $this > 1000
+```
+
+`average` does not change the units. For example, if the chart units is `requests/sec`, the result
+will be again expressed in the same units. 
+
+It can also be used in APIs and badges as `&group=average` in the URL.
+
+## Examples
+
+Examining last 1 minute `successful` web server responses:
+
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=min&after=-60&label=min)
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=average&after=-60&label=average&value_color=orange)
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=max&after=-60&label=max)
+
+## References
+
+- [https://en.wikipedia.org/wiki/Average](https://en.wikipedia.org/wiki/Average).
diff --git a/web/api/queries/average/average.c b/web/api/queries/average/average.c
new file mode 100644
index 000000000..c871b8778
--- /dev/null
+++ b/web/api/queries/average/average.c
@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "average.h"
+
+// ----------------------------------------------------------------------------
+// average
+
+struct grouping_average {
+    calculated_number sum;
+    size_t count;
+};
+
+void *grouping_create_average(RRDR *r) {
+    (void)r;
+    return callocz(1, sizeof(struct grouping_average));
+}
+
+// resets when switches dimensions
+// so, clear everything to restart
+void grouping_reset_average(RRDR *r) {
+    struct grouping_average *g = (struct grouping_average *)r->internal.grouping_data;
+    g->sum = 0;
+    g->count = 0;
+}
+
+void grouping_free_average(RRDR *r) {
+    freez(r->internal.grouping_data);
+    r->internal.grouping_data = NULL;
+}
+
+void grouping_add_average(RRDR *r, calculated_number value) {
+    if(!isnan(value)) {
+        struct grouping_average *g = (struct grouping_average *)r->internal.grouping_data;
+        g->sum += value;
+        g->count++;
+    }
+}
+
+calculated_number grouping_flush_average(RRDR *r,  RRDR_VALUE_FLAGS *rrdr_value_options_ptr) {
+    struct grouping_average *g = (struct grouping_average *)r->internal.grouping_data;
+
+    calculated_number value;
+
+    if(unlikely(!g->count)) {
+        value = 0.0;
+        *rrdr_value_options_ptr |= RRDR_VALUE_EMPTY;
+    }
+    else {
+        if(unlikely(r->internal.resampling_group != 1))
+            value = g->sum / r->internal.resampling_divisor;
+        else
+            value = g->sum / g->count;
+    }
+
+    g->sum = 0.0;
+    g->count = 0;
+
+    return value;
+}
diff --git a/web/api/queries/average/average.h b/web/api/queries/average/average.h
new file mode 100644
index 000000000..9fb7de21a
--- /dev/null
+++ b/web/api/queries/average/average.h
@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_API_QUERY_AVERAGE_H
+#define NETDATA_API_QUERY_AVERAGE_H
+
+#include "../query.h"
+#include "../rrdr.h"
+
+extern void *grouping_create_average(RRDR *r);
+extern void grouping_reset_average(RRDR *r);
+extern void grouping_free_average(RRDR *r);
+extern void grouping_add_average(RRDR *r, calculated_number value);
+extern calculated_number grouping_flush_average(RRDR *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr);
+
+#endif //NETDATA_API_QUERY_AVERAGE_H
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new file mode 100644
index 000000000..19554bed8
--- /dev/null
+++ b/web/api/queries/des/Makefile.am
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+	    || exit 1; \
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+	done
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diff --git a/web/api/queries/des/README.md b/web/api/queries/des/README.md
new file mode 100644
index 000000000..fa546a338
--- /dev/null
+++ b/web/api/queries/des/README.md
@@ -0,0 +1,66 @@
+# double exponential smoothing
+
+Exponential smoothing is one of many window functions commonly applied to smooth data in signal
+processing, acting as low-pass filters to remove high frequency noise.
+
+Simple exponential smoothing does not do well when there is a trend in the data.
+In such situations, several methods were devised under the name "double exponential smoothing"
+or "second-order exponential smoothing.", which is the recursive application of an exponential
+filter twice, thus being termed "double exponential smoothing".
+
+In simple terms, this is like an average value, but more recent values are given more weight
+and the trend of the values influences significantly the result.
+
+> **IMPORTANT**
+>
+> It is common for `des` to provide "average" values that far beyond the minimum or the maximum
+> values found in the time-series.
+> `des` estimates these values because of it takes into account the trend.
+
+This module implements the "Holt-Winters double exponential smoothing".
+
+Netdata automatically adjusts the weight (`alpha`) and the trend (`beta`) based on the number
+of values processed, using the formula:
+
+```
+window = max(number of values, 15)
+alpha  = 2 / (window + 1)
+beta   = 2 / (window + 1)
+```
+
+You can change the fixed value `15` by setting in `netdata.conf`:
+
+```
+[web]
+   des max window = 15
+```
+
+## how to use
+
+Use it in alarms like this:
+
+```
+ alarm: my_alarm
+    on: my_chart
+lookup: des -1m unaligned of my_dimension
+  warn: $this > 1000
+```
+
+`des` does not change the units. For example, if the chart units is `requests/sec`, the result
+will be again expressed in the same units. 
+
+It can also be used in APIs and badges as `&group=des` in the URL.
+
+## Examples
+
+Examining last 1 minute `successful` web server responses:
+
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=min&after=-60&label=min)
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=average&after=-60&label=average&value_color=yellow)
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=ses&after=-60&label=single+exponential+smoothing&value_color=yellow)
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=des&after=-60&label=double+exponential+smoothing&value_color=orange)
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=max&after=-60&label=max)
+
+## References
+
+- [https://en.wikipedia.org/wiki/Exponential_smoothing](https://en.wikipedia.org/wiki/Exponential_smoothing).
diff --git a/web/api/queries/des/des.c b/web/api/queries/des/des.c
new file mode 100644
index 000000000..93d724723
--- /dev/null
+++ b/web/api/queries/des/des.c
@@ -0,0 +1,139 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include <web/api/queries/rrdr.h>
+#include "des.h"
+
+
+// ----------------------------------------------------------------------------
+// single exponential smoothing
+
+struct grouping_des {
+    calculated_number alpha;
+    calculated_number alpha_other;
+    calculated_number beta;
+    calculated_number beta_other;
+
+    calculated_number level;
+    calculated_number trend;
+
+    size_t count;
+};
+
+static size_t max_window_size = 15;
+
+void grouping_init_des(void) {
+    long long ret = config_get_number(CONFIG_SECTION_WEB, "des max window", (long long)max_window_size);
+    if(ret <= 1) {
+        config_set_number(CONFIG_SECTION_WEB, "des max window", (long long)max_window_size);
+    }
+    else {
+        max_window_size = (size_t) ret;
+    }
+}
+
+static inline calculated_number window(RRDR *r, struct grouping_des *g) {
+    (void)g;
+
+    calculated_number points;
+    if(r->group == 1) {
+        // provide a running DES
+        points = r->internal.points_wanted;
+    }
+    else {
+        // provide a SES with flush points
+        points = r->group;
+    }
+
+    // https://en.wikipedia.org/wiki/Moving_average#Exponential_moving_average
+    // A commonly used value for alpha is 2 / (N + 1)
+    return (points > max_window_size) ? max_window_size : points;
+}
+
+static inline void set_alpha(RRDR *r, struct grouping_des *g) {
+    // https://en.wikipedia.org/wiki/Moving_average#Exponential_moving_average
+    // A commonly used value for alpha is 2 / (N + 1)
+
+    g->alpha = 2.0 / (window(r, g) + 1.0);
+    g->alpha_other = 1.0 - g->alpha;
+
+    //info("alpha for chart '%s' is " CALCULATED_NUMBER_FORMAT, r->st->name, g->alpha);
+}
+
+static inline void set_beta(RRDR *r, struct grouping_des *g) {
+    // https://en.wikipedia.org/wiki/Moving_average#Exponential_moving_average
+    // A commonly used value for alpha is 2 / (N + 1)
+
+    g->beta = 2.0 / (window(r, g) + 1.0);
+    g->beta_other = 1.0 - g->beta;
+
+    //info("beta for chart '%s' is " CALCULATED_NUMBER_FORMAT, r->st->name, g->beta);
+}
+
+void *grouping_create_des(RRDR *r) {
+    struct grouping_des *g = (struct grouping_des *)malloc(sizeof(struct grouping_des));
+    set_alpha(r, g);
+    set_beta(r, g);
+    g->level = 0.0;
+    g->trend = 0.0;
+    g->count = 0;
+    return g;
+}
+
+// resets when switches dimensions
+// so, clear everything to restart
+void grouping_reset_des(RRDR *r) {
+    struct grouping_des *g = (struct grouping_des *)r->internal.grouping_data;
+    g->level = 0.0;
+    g->trend = 0.0;
+    g->count = 0;
+
+    // fprintf(stderr, "\nDES: ");
+
+}
+
+void grouping_free_des(RRDR *r) {
+    freez(r->internal.grouping_data);
+    r->internal.grouping_data = NULL;
+}
+
+void grouping_add_des(RRDR *r, calculated_number value) {
+    struct grouping_des *g = (struct grouping_des *)r->internal.grouping_data;
+
+    if(isnormal(value)) {
+        if(likely(g->count > 0)) {
+            // we have at least a number so far
+
+            if(unlikely(g->count == 1)) {
+                // the second value we got
+                g->trend = value - g->trend;
+                g->level = value;
+            }
+
+            // for the values, except the first
+            calculated_number last_level = g->level;
+            g->level = (g->alpha * value) + (g->alpha_other * (g->level + g->trend));
+            g->trend = (g->beta * (g->level - last_level)) + (g->beta_other * g->trend);
+        }
+        else {
+            // the first value we got
+            g->level = g->trend = value;
+        }
+
+        g->count++;
+    }
+
+    //fprintf(stderr, "value: " CALCULATED_NUMBER_FORMAT ", level: " CALCULATED_NUMBER_FORMAT ", trend: " CALCULATED_NUMBER_FORMAT "\n", value, g->level, g->trend);
+}
+
+calculated_number grouping_flush_des(RRDR *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr) {
+    struct grouping_des *g = (struct grouping_des *)r->internal.grouping_data;
+
+    if(unlikely(!g->count || !isnormal(g->level))) {
+        *rrdr_value_options_ptr |= RRDR_VALUE_EMPTY;
+        return 0.0;
+    }
+
+    //fprintf(stderr, " RESULT for %zu values = " CALCULATED_NUMBER_FORMAT " \n", g->count, g->level);
+
+    return g->level;
+}
diff --git a/web/api/queries/des/des.h b/web/api/queries/des/des.h
new file mode 100644
index 000000000..360513e9c
--- /dev/null
+++ b/web/api/queries/des/des.h
@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_API_QUERIES_DES_H
+#define NETDATA_API_QUERIES_DES_H
+
+#include "../query.h"
+#include "../rrdr.h"
+
+extern void grouping_init_des(void);
+
+extern void *grouping_create_des(RRDR *r);
+extern void grouping_reset_des(RRDR *r);
+extern void grouping_free_des(RRDR *r);
+extern void grouping_add_des(RRDR *r, calculated_number value);
+extern calculated_number grouping_flush_des(RRDR *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr);
+
+#endif //NETDATA_API_QUERIES_DES_H
diff --git a/web/api/queries/incremental_sum/Makefile.am b/web/api/queries/incremental_sum/Makefile.am
new file mode 100644
index 000000000..19554bed8
--- /dev/null
+++ b/web/api/queries/incremental_sum/Makefile.am
@@ -0,0 +1,8 @@
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new file mode 100644
index 000000000..1863466fe
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@@ -0,0 +1,464 @@
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diff --git a/web/api/queries/incremental_sum/README.md b/web/api/queries/incremental_sum/README.md
new file mode 100644
index 000000000..ef86d4d41
--- /dev/null
+++ b/web/api/queries/incremental_sum/README.md
@@ -0,0 +1,34 @@
+# Incremental Sum (`incremental_sum`)
+
+This modules finds the incremental sum of a period, which `last value - first value`.
+
+The result may be positive (rising) or negative (falling) depending on the first and last values.
+
+## how to use
+
+Use it in alarms like this:
+
+```
+ alarm: my_alarm
+    on: my_chart
+lookup: incremental_sum -1m unaligned of my_dimension
+  warn: $this > 1000
+```
+
+`incremental_sum` does not change the units. For example, if the chart units is `requests/sec`, the result
+will be again expressed in the same units. 
+
+It can also be used in APIs and badges as `&group=incremental_sum` in the URL.
+
+## Examples
+
+Examining last 1 minute `successful` web server responses:
+
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=min&after=-60&label=min)
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=average&after=-60&label=average)
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=max&after=-60&label=max)
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=incremental_sum&after=-60&label=incremental+sum&value_color=orange)
+
+## References
+
+- none
diff --git a/web/api/queries/incremental_sum/incremental_sum.c b/web/api/queries/incremental_sum/incremental_sum.c
new file mode 100644
index 000000000..131d85d78
--- /dev/null
+++ b/web/api/queries/incremental_sum/incremental_sum.c
@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "incremental_sum.h"
+
+// ----------------------------------------------------------------------------
+// incremental sum
+
+struct grouping_incremental_sum {
+    calculated_number first;
+    calculated_number last;
+    size_t count;
+};
+
+void *grouping_create_incremental_sum(RRDR *r) {
+    (void)r;
+    return callocz(1, sizeof(struct grouping_incremental_sum));
+}
+
+// resets when switches dimensions
+// so, clear everything to restart
+void grouping_reset_incremental_sum(RRDR *r) {
+    struct grouping_incremental_sum *g = (struct grouping_incremental_sum *)r->internal.grouping_data;
+    g->first = 0;
+    g->last = 0;
+    g->count = 0;
+}
+
+void grouping_free_incremental_sum(RRDR *r) {
+    freez(r->internal.grouping_data);
+    r->internal.grouping_data = NULL;
+}
+
+void grouping_add_incremental_sum(RRDR *r, calculated_number value) {
+    if(!isnan(value)) {
+        struct grouping_incremental_sum *g = (struct grouping_incremental_sum *)r->internal.grouping_data;
+
+        if(unlikely(!g->count)) {
+            g->first = value;
+            g->count++;
+        }
+        else {
+            g->last = value;
+            g->count++;
+        }
+    }
+}
+
+calculated_number grouping_flush_incremental_sum(RRDR *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr) {
+    struct grouping_incremental_sum *g = (struct grouping_incremental_sum *)r->internal.grouping_data;
+
+    calculated_number value;
+
+    if(unlikely(!g->count)) {
+        value = 0.0;
+        *rrdr_value_options_ptr |= RRDR_VALUE_EMPTY;
+    }
+    else if(unlikely(g->count == 1)) {
+        value = 0.0;
+    }
+    else {
+        value = g->last - g->first;
+    }
+
+    g->first = 0.0;
+    g->last = 0.0;
+    g->count = 0;
+
+    return value;
+}
diff --git a/web/api/queries/incremental_sum/incremental_sum.h b/web/api/queries/incremental_sum/incremental_sum.h
new file mode 100644
index 000000000..990a2ac4a
--- /dev/null
+++ b/web/api/queries/incremental_sum/incremental_sum.h
@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_API_QUERY_INCREMENTAL_SUM_H
+#define NETDATA_API_QUERY_INCREMENTAL_SUM_H
+
+#include "../query.h"
+#include "../rrdr.h"
+
+extern void *grouping_create_incremental_sum(RRDR *r);
+extern void grouping_reset_incremental_sum(RRDR *r);
+extern void grouping_free_incremental_sum(RRDR *r);
+extern void grouping_add_incremental_sum(RRDR *r, calculated_number value);
+extern calculated_number grouping_flush_incremental_sum(RRDR *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr);
+
+#endif //NETDATA_API_QUERY_INCREMENTAL_SUM_H
diff --git a/web/api/queries/max/Makefile.am b/web/api/queries/max/Makefile.am
new file mode 100644
index 000000000..19554bed8
--- /dev/null
+++ b/web/api/queries/max/Makefile.am
@@ -0,0 +1,8 @@
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diff --git a/web/api/queries/max/Makefile.in b/web/api/queries/max/Makefile.in
new file mode 100644
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diff --git a/web/api/queries/max/README.md b/web/api/queries/max/README.md
new file mode 100644
index 000000000..2ea14bf0b
--- /dev/null
+++ b/web/api/queries/max/README.md
@@ -0,0 +1,31 @@
+# Max
+
+This module finds the max value in the time-frame given.
+
+## how to use
+
+Use it in alarms like this:
+
+```
+ alarm: my_alarm
+    on: my_chart
+lookup: max -1m unaligned of my_dimension
+  warn: $this > 1000
+```
+
+`max` does not change the units. For example, if the chart units is `requests/sec`, the result
+will be again expressed in the same units. 
+
+It can also be used in APIs and badges as `&group=max` in the URL.
+
+## Examples
+
+Examining last 1 minute `successful` web server responses:
+
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=min&after=-60&label=min)
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=average&after=-60&label=average)
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=max&after=-60&label=max&value_color=orange)
+
+## References
+
+- [https://en.wikipedia.org/wiki/Sample_maximum_and_minimum](https://en.wikipedia.org/wiki/Sample_maximum_and_minimum).
diff --git a/web/api/queries/max/max.c b/web/api/queries/max/max.c
new file mode 100644
index 000000000..a4be36add
--- /dev/null
+++ b/web/api/queries/max/max.c
@@ -0,0 +1,60 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "max.h"
+
+// ----------------------------------------------------------------------------
+// max
+
+struct grouping_max {
+    calculated_number max;
+    size_t count;
+};
+
+void *grouping_create_max(RRDR *r) {
+    (void)r;
+    return callocz(1, sizeof(struct grouping_max));
+}
+
+// resets when switches dimensions
+// so, clear everything to restart
+void grouping_reset_max(RRDR *r) {
+    struct grouping_max *g = (struct grouping_max *)r->internal.grouping_data;
+    g->max = 0;
+    g->count = 0;
+}
+
+void grouping_free_max(RRDR *r) {
+    freez(r->internal.grouping_data);
+    r->internal.grouping_data = NULL;
+}
+
+void grouping_add_max(RRDR *r, calculated_number value) {
+    if(!isnan(value)) {
+        struct grouping_max *g = (struct grouping_max *)r->internal.grouping_data;
+
+        if(!g->count || calculated_number_fabs(value) > calculated_number_fabs(g->max)) {
+            g->max = value;
+            g->count++;
+        }
+    }
+}
+
+calculated_number grouping_flush_max(RRDR *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr) {
+    struct grouping_max *g = (struct grouping_max *)r->internal.grouping_data;
+
+    calculated_number value;
+
+    if(unlikely(!g->count)) {
+        value = 0.0;
+        *rrdr_value_options_ptr |= RRDR_VALUE_EMPTY;
+    }
+    else {
+        value = g->max;
+    }
+
+    g->max = 0.0;
+    g->count = 0;
+
+    return value;
+}
+
diff --git a/web/api/queries/max/max.h b/web/api/queries/max/max.h
new file mode 100644
index 000000000..d839fe3f9
--- /dev/null
+++ b/web/api/queries/max/max.h
@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_API_QUERY_MAX_H
+#define NETDATA_API_QUERY_MAX_H
+
+#include "../query.h"
+#include "../rrdr.h"
+
+extern void *grouping_create_max(RRDR *r);
+extern void grouping_reset_max(RRDR *r);
+extern void grouping_free_max(RRDR *r);
+extern void grouping_add_max(RRDR *r, calculated_number value);
+extern calculated_number grouping_flush_max(RRDR *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr);
+
+#endif //NETDATA_API_QUERY_MAX_H
diff --git a/web/api/queries/median/Makefile.am b/web/api/queries/median/Makefile.am
new file mode 100644
index 000000000..19554bed8
--- /dev/null
+++ b/web/api/queries/median/Makefile.am
@@ -0,0 +1,8 @@
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diff --git a/web/api/queries/median/Makefile.in b/web/api/queries/median/Makefile.in
new file mode 100644
index 000000000..f6d471bdf
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diff --git a/web/api/queries/median/README.md b/web/api/queries/median/README.md
new file mode 100644
index 000000000..eb2dbaa96
--- /dev/null
+++ b/web/api/queries/median/README.md
@@ -0,0 +1,37 @@
+# Median
+
+The median is the value separating the higher half from the lower half of a data sample
+(a population or a probability distribution). For a data set, it may be thought of as the
+"middle" value.
+
+`median` is not an accurate average. However, it eliminates all spikes, by sorting
+all the values in a period, and selecting the value in the middle of the sorted array.
+
+## how to use
+
+Use it in alarms like this:
+
+```
+ alarm: my_alarm
+    on: my_chart
+lookup: median -1m unaligned of my_dimension
+  warn: $this > 1000
+```
+
+`median` does not change the units. For example, if the chart units is `requests/sec`, the result
+will be again expressed in the same units. 
+
+It can also be used in APIs and badges as `&group=median` in the URL.
+
+## Examples
+
+Examining last 1 minute `successful` web server responses:
+
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=min&after=-60&label=min)
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=average&after=-60&label=average)
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=median&after=-60&label=median&value_color=orange)
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=max&after=-60&label=max)
+
+## References
+
+- [https://en.wikipedia.org/wiki/Median](https://en.wikipedia.org/wiki/Median).
diff --git a/web/api/queries/median/median.c b/web/api/queries/median/median.c
new file mode 100644
index 000000000..5a13b2e4d
--- /dev/null
+++ b/web/api/queries/median/median.c
@@ -0,0 +1,79 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "median.h"
+
+
+// ----------------------------------------------------------------------------
+// median
+
+struct grouping_median {
+    size_t series_size;
+    size_t next_pos;
+
+    LONG_DOUBLE series[];
+};
+
+void *grouping_create_median(RRDR *r) {
+    long entries = r->group;
+    if(entries < 0) entries = 0;
+
+    struct grouping_median *g = (struct grouping_median *)callocz(1, sizeof(struct grouping_median) + entries * sizeof(LONG_DOUBLE));
+    g->series_size = (size_t)entries;
+
+    return g;
+}
+
+// resets when switches dimensions
+// so, clear everything to restart
+void grouping_reset_median(RRDR *r) {
+    struct grouping_median *g = (struct grouping_median *)r->internal.grouping_data;
+    g->next_pos = 0;
+}
+
+void grouping_free_median(RRDR *r) {
+    freez(r->internal.grouping_data);
+    r->internal.grouping_data = NULL;
+}
+
+void grouping_add_median(RRDR *r, calculated_number value) {
+    struct grouping_median *g = (struct grouping_median *)r->internal.grouping_data;
+
+    if(unlikely(g->next_pos >= g->series_size)) {
+        error("INTERNAL ERROR: median buffer overflow on chart '%s' - next_pos = %zu, series_size = %zu, r->group = %ld.", r->st->name, g->next_pos, g->series_size, r->group);
+    }
+    else {
+        if(isnormal(value))
+            g->series[g->next_pos++] = (LONG_DOUBLE)value;
+    }
+}
+
+calculated_number grouping_flush_median(RRDR *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr) {
+    struct grouping_median *g = (struct grouping_median *)r->internal.grouping_data;
+
+    calculated_number value;
+
+    if(unlikely(!g->next_pos)) {
+        value = 0.0;
+        *rrdr_value_options_ptr |= RRDR_VALUE_EMPTY;
+    }
+    else {
+        if(g->next_pos > 1) {
+            sort_series(g->series, g->next_pos);
+            value = (calculated_number)median_on_sorted_series(g->series, g->next_pos);
+        }
+        else
+            value = (calculated_number)g->series[0];
+
+        if(!isnormal(value)) {
+            value = 0.0;
+            *rrdr_value_options_ptr |= RRDR_VALUE_EMPTY;
+        }
+
+        //log_series_to_stderr(g->series, g->next_pos, value, "median");
+    }
+
+    g->next_pos = 0;
+
+    return value;
+}
+
diff --git a/web/api/queries/median/median.h b/web/api/queries/median/median.h
new file mode 100644
index 000000000..dd2c1ffc5
--- /dev/null
+++ b/web/api/queries/median/median.h
@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_API_QUERIES_MEDIAN_H
+#define NETDATA_API_QUERIES_MEDIAN_H
+
+#include "../query.h"
+#include "../rrdr.h"
+
+extern void *grouping_create_median(RRDR *r);
+extern void grouping_reset_median(RRDR *r);
+extern void grouping_free_median(RRDR *r);
+extern void grouping_add_median(RRDR *r, calculated_number value);
+extern calculated_number grouping_flush_median(RRDR *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr);
+
+#endif //NETDATA_API_QUERIES_MEDIAN_H
diff --git a/web/api/queries/min/Makefile.am b/web/api/queries/min/Makefile.am
new file mode 100644
index 000000000..19554bed8
--- /dev/null
+++ b/web/api/queries/min/Makefile.am
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diff --git a/web/api/queries/min/Makefile.in b/web/api/queries/min/Makefile.in
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index 000000000..11fa615f6
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+AUTOMAKE_OPTIONS = subdir-objects
+MAINTAINERCLEANFILES = $(srcdir)/Makefile.in
+dist_noinst_DATA = \
+	README.md \
+	$(NULL)
+
+all: all-am
+
+.SUFFIXES:
+$(srcdir)/Makefile.in: @MAINTAINER_MODE_TRUE@ $(srcdir)/Makefile.am  $(am__configure_deps)
+	@for dep in $?; do \
+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
+	      ( cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh ) \
+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --gnu web/api/queries/min/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --gnu web/api/queries/min/Makefile
+.PRECIOUS: Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+	@case '$?' in \
+	  *config.status*) \
+	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
+	  *) \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__depfiles_maybe)'; \
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+	esac;
+
+$(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+
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+
+ctags CTAGS:
+
+cscope cscopelist:
+
+
+distdir: $(DISTFILES)
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+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
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+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
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+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
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diff --git a/web/api/queries/min/README.md b/web/api/queries/min/README.md
new file mode 100644
index 000000000..3fe13106a
--- /dev/null
+++ b/web/api/queries/min/README.md
@@ -0,0 +1,31 @@
+# Min
+
+This module finds the min value in the time-frame given.
+
+## how to use
+
+Use it in alarms like this:
+
+```
+ alarm: my_alarm
+    on: my_chart
+lookup: min -1m unaligned of my_dimension
+  warn: $this > 1000
+```
+
+`min` does not change the units. For example, if the chart units is `requests/sec`, the result
+will be again expressed in the same units. 
+
+It can also be used in APIs and badges as `&group=min` in the URL.
+
+## Examples
+
+Examining last 1 minute `successful` web server responses:
+
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=min&after=-60&label=min&value_color=orange)
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=average&after=-60&label=average)
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=max&after=-60&label=max)
+
+## References
+
+- [https://en.wikipedia.org/wiki/Sample_maximum_and_minimum](https://en.wikipedia.org/wiki/Sample_maximum_and_minimum).
diff --git a/web/api/queries/min/min.c b/web/api/queries/min/min.c
new file mode 100644
index 000000000..9bd7460e0
--- /dev/null
+++ b/web/api/queries/min/min.c
@@ -0,0 +1,60 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "min.h"
+
+// ----------------------------------------------------------------------------
+// min
+
+struct grouping_min {
+    calculated_number min;
+    size_t count;
+};
+
+void *grouping_create_min(RRDR *r) {
+    (void)r;
+    return callocz(1, sizeof(struct grouping_min));
+}
+
+// resets when switches dimensions
+// so, clear everything to restart
+void grouping_reset_min(RRDR *r) {
+    struct grouping_min *g = (struct grouping_min *)r->internal.grouping_data;
+    g->min = 0;
+    g->count = 0;
+}
+
+void grouping_free_min(RRDR *r) {
+    freez(r->internal.grouping_data);
+    r->internal.grouping_data = NULL;
+}
+
+void grouping_add_min(RRDR *r, calculated_number value) {
+    if(!isnan(value)) {
+        struct grouping_min *g = (struct grouping_min *)r->internal.grouping_data;
+
+        if(!g->count || calculated_number_fabs(value) < calculated_number_fabs(g->min)) {
+            g->min = value;
+            g->count++;
+        }
+    }
+}
+
+calculated_number grouping_flush_min(RRDR *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr) {
+    struct grouping_min *g = (struct grouping_min *)r->internal.grouping_data;
+
+    calculated_number value;
+
+    if(unlikely(!g->count)) {
+        value = 0.0;
+        *rrdr_value_options_ptr |= RRDR_VALUE_EMPTY;
+    }
+    else {
+        value = g->min;
+    }
+
+    g->min = 0.0;
+    g->count = 0;
+
+    return value;
+}
+
diff --git a/web/api/queries/min/min.h b/web/api/queries/min/min.h
new file mode 100644
index 000000000..74703605c
--- /dev/null
+++ b/web/api/queries/min/min.h
@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_API_QUERY_MIN_H
+#define NETDATA_API_QUERY_MIN_H
+
+#include "../query.h"
+#include "../rrdr.h"
+
+extern void *grouping_create_min(RRDR *r);
+extern void grouping_reset_min(RRDR *r);
+extern void grouping_free_min(RRDR *r);
+extern void grouping_add_min(RRDR *r, calculated_number value);
+extern calculated_number grouping_flush_min(RRDR *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr);
+
+#endif //NETDATA_API_QUERY_MIN_H
diff --git a/web/api/queries/query.c b/web/api/queries/query.c
new file mode 100644
index 000000000..d03b43d3c
--- /dev/null
+++ b/web/api/queries/query.c
@@ -0,0 +1,974 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "query.h"
+#include "web/api/formatters/rrd2json.h"
+#include "rrdr.h"
+
+#include "average/average.h"
+#include "incremental_sum/incremental_sum.h"
+#include "max/max.h"
+#include "median/median.h"
+#include "min/min.h"
+#include "sum/sum.h"
+#include "stddev/stddev.h"
+#include "ses/ses.h"
+#include "des/des.h"
+
+// ----------------------------------------------------------------------------
+
+static struct {
+    const char *name;
+    uint32_t hash;
+    RRDR_GROUPING value;
+
+    // One time initialization for the module.
+    // This is called once, when netdata starts.
+    void (*init)(void);
+
+    // Allocate all required structures for a query.
+    // This is called once for each netdata query.
+    void *(*create)(struct rrdresult *r);
+
+    // Cleanup collected values, but don't destroy the structures.
+    // This is called when the query engine switches dimensions,
+    // as part of the same query (so same chart, switching metric).
+    void (*reset)(struct rrdresult *r);
+
+    // Free all resources allocated for the query.
+    void (*free)(struct rrdresult *r);
+
+    // Add a single value into the calculation.
+    // The module may decide to cache it, or use it in the fly.
+    void (*add)(struct rrdresult *r, calculated_number value);
+
+    // Generate a single result for the values added so far.
+    // More values and points may be requested later.
+    // It is up to the module to reset its internal structures
+    // when flushing it (so for a few modules it may be better to
+    // continue after a flush as if nothing changed, for others a
+    // cleanup of the internal structures may be required).
+    calculated_number (*flush)(struct rrdresult *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr);
+} api_v1_data_groups[] = {
+        {.name = "average",
+                .hash  = 0,
+                .value = RRDR_GROUPING_AVERAGE,
+                .init  = NULL,
+                .create= grouping_create_average,
+                .reset = grouping_reset_average,
+                .free  = grouping_free_average,
+                .add   = grouping_add_average,
+                .flush = grouping_flush_average
+        },
+        {.name = "mean",                           // alias on 'average'
+                .hash  = 0,
+                .value = RRDR_GROUPING_AVERAGE,
+                .init  = NULL,
+                .create= grouping_create_average,
+                .reset = grouping_reset_average,
+                .free  = grouping_free_average,
+                .add   = grouping_add_average,
+                .flush = grouping_flush_average
+        },
+        {.name  = "incremental_sum",
+                .hash  = 0,
+                .value = RRDR_GROUPING_INCREMENTAL_SUM,
+                .init  = NULL,
+                .create= grouping_create_incremental_sum,
+                .reset = grouping_reset_incremental_sum,
+                .free  = grouping_free_incremental_sum,
+                .add   = grouping_add_incremental_sum,
+                .flush = grouping_flush_incremental_sum
+        },
+        {.name = "incremental-sum",
+                .hash  = 0,
+                .value = RRDR_GROUPING_INCREMENTAL_SUM,
+                .init  = NULL,
+                .create= grouping_create_incremental_sum,
+                .reset = grouping_reset_incremental_sum,
+                .free  = grouping_free_incremental_sum,
+                .add   = grouping_add_incremental_sum,
+                .flush = grouping_flush_incremental_sum
+        },
+        {.name = "median",
+                .hash  = 0,
+                .value = RRDR_GROUPING_MEDIAN,
+                .init  = NULL,
+                .create= grouping_create_median,
+                .reset = grouping_reset_median,
+                .free  = grouping_free_median,
+                .add   = grouping_add_median,
+                .flush = grouping_flush_median
+        },
+        {.name = "min",
+                .hash  = 0,
+                .value = RRDR_GROUPING_MIN,
+                .init  = NULL,
+                .create= grouping_create_min,
+                .reset = grouping_reset_min,
+                .free  = grouping_free_min,
+                .add   = grouping_add_min,
+                .flush = grouping_flush_min
+        },
+        {.name = "max",
+                .hash  = 0,
+                .value = RRDR_GROUPING_MAX,
+                .init  = NULL,
+                .create= grouping_create_max,
+                .reset = grouping_reset_max,
+                .free  = grouping_free_max,
+                .add   = grouping_add_max,
+                .flush = grouping_flush_max
+        },
+        {.name = "sum",
+                .hash  = 0,
+                .value = RRDR_GROUPING_SUM,
+                .init  = NULL,
+                .create= grouping_create_sum,
+                .reset = grouping_reset_sum,
+                .free  = grouping_free_sum,
+                .add   = grouping_add_sum,
+                .flush = grouping_flush_sum
+        },
+
+        // standard deviation
+        {.name = "stddev",
+                .hash  = 0,
+                .value = RRDR_GROUPING_STDDEV,
+                .init  = NULL,
+                .create= grouping_create_stddev,
+                .reset = grouping_reset_stddev,
+                .free  = grouping_free_stddev,
+                .add   = grouping_add_stddev,
+                .flush = grouping_flush_stddev
+        },
+        {.name = "cv",                           // coefficient variation is calculated by stddev
+                .hash  = 0,
+                .value = RRDR_GROUPING_CV,
+                .init  = NULL,
+                .create= grouping_create_stddev, // not an error, stddev calculates this too
+                .reset = grouping_reset_stddev,  // not an error, stddev calculates this too
+                .free  = grouping_free_stddev,   // not an error, stddev calculates this too
+                .add   = grouping_add_stddev,    // not an error, stddev calculates this too
+                .flush = grouping_flush_coefficient_of_variation
+        },
+        {.name = "rsd",                          // alias of 'cv'
+                .hash  = 0,
+                .value = RRDR_GROUPING_CV,
+                .init  = NULL,
+                .create= grouping_create_stddev, // not an error, stddev calculates this too
+                .reset = grouping_reset_stddev,  // not an error, stddev calculates this too
+                .free  = grouping_free_stddev,   // not an error, stddev calculates this too
+                .add   = grouping_add_stddev,    // not an error, stddev calculates this too
+                .flush = grouping_flush_coefficient_of_variation
+        },
+
+        /*
+        {.name = "mean",                        // same as average, no need to define it again
+                .hash  = 0,
+                .value = RRDR_GROUPING_MEAN,
+                .setup = NULL,
+                .create= grouping_create_stddev,
+                .reset = grouping_reset_stddev,
+                .free  = grouping_free_stddev,
+                .add   = grouping_add_stddev,
+                .flush = grouping_flush_mean
+        },
+        */
+
+        /*
+        {.name = "variance",                    // meaningless to offer
+                .hash  = 0,
+                .value = RRDR_GROUPING_VARIANCE,
+                .setup = NULL,
+                .create= grouping_create_stddev,
+                .reset = grouping_reset_stddev,
+                .free  = grouping_free_stddev,
+                .add   = grouping_add_stddev,
+                .flush = grouping_flush_variance
+        },
+        */
+
+        // single exponential smoothing
+        {.name = "ses",
+                .hash  = 0,
+                .value = RRDR_GROUPING_SES,
+                .init = grouping_init_ses,
+                .create= grouping_create_ses,
+                .reset = grouping_reset_ses,
+                .free  = grouping_free_ses,
+                .add   = grouping_add_ses,
+                .flush = grouping_flush_ses
+        },
+        {.name = "ema",                         // alias for 'ses'
+                .hash  = 0,
+                .value = RRDR_GROUPING_SES,
+                .init = NULL,
+                .create= grouping_create_ses,
+                .reset = grouping_reset_ses,
+                .free  = grouping_free_ses,
+                .add   = grouping_add_ses,
+                .flush = grouping_flush_ses
+        },
+        {.name = "ewma",                        // alias for ses
+                .hash  = 0,
+                .value = RRDR_GROUPING_SES,
+                .init = NULL,
+                .create= grouping_create_ses,
+                .reset = grouping_reset_ses,
+                .free  = grouping_free_ses,
+                .add   = grouping_add_ses,
+                .flush = grouping_flush_ses
+        },
+
+        // double exponential smoothing
+        {.name = "des",
+                .hash  = 0,
+                .value = RRDR_GROUPING_DES,
+                .init = grouping_init_des,
+                .create= grouping_create_des,
+                .reset = grouping_reset_des,
+                .free  = grouping_free_des,
+                .add   = grouping_add_des,
+                .flush = grouping_flush_des
+        },
+
+        // terminator
+        {.name = NULL,
+                .hash  = 0,
+                .value = RRDR_GROUPING_UNDEFINED,
+                .init = NULL,
+                .create= grouping_create_average,
+                .reset = grouping_reset_average,
+                .free  = grouping_free_average,
+                .add   = grouping_add_average,
+                .flush = grouping_flush_average
+        }
+};
+
+void web_client_api_v1_init_grouping(void) {
+    int i;
+
+    for(i = 0; api_v1_data_groups[i].name ; i++) {
+        api_v1_data_groups[i].hash = simple_hash(api_v1_data_groups[i].name);
+
+        if(api_v1_data_groups[i].init)
+            api_v1_data_groups[i].init();
+    }
+}
+
+const char *group_method2string(RRDR_GROUPING group) {
+    int i;
+
+    for(i = 0; api_v1_data_groups[i].name ; i++) {
+        if(api_v1_data_groups[i].value == group) {
+            return api_v1_data_groups[i].name;
+        }
+    }
+
+    return "unknown-group-method";
+}
+
+RRDR_GROUPING web_client_api_request_v1_data_group(const char *name, RRDR_GROUPING def) {
+    int i;
+
+    uint32_t hash = simple_hash(name);
+    for(i = 0; api_v1_data_groups[i].name ; i++)
+        if(unlikely(hash == api_v1_data_groups[i].hash && !strcmp(name, api_v1_data_groups[i].name)))
+            return api_v1_data_groups[i].value;
+
+    return def;
+}
+
+// ----------------------------------------------------------------------------
+
+static void rrdr_disable_not_selected_dimensions(RRDR *r, RRDR_OPTIONS options, const char *dims) {
+    rrdset_check_rdlock(r->st);
+
+    if(unlikely(!dims || !*dims || (dims[0] == '*' && dims[1] == '\0'))) return;
+
+    int match_ids = 0, match_names = 0;
+
+    if(unlikely(options & RRDR_OPTION_MATCH_IDS))
+        match_ids = 1;
+    if(unlikely(options & RRDR_OPTION_MATCH_NAMES))
+        match_names = 1;
+
+    if(likely(!match_ids && !match_names))
+        match_ids = match_names = 1;
+
+    SIMPLE_PATTERN *pattern = simple_pattern_create(dims, ",|\t\r\n\f\v", SIMPLE_PATTERN_EXACT);
+
+    RRDDIM *d;
+    long c, dims_selected = 0, dims_not_hidden_not_zero = 0;
+    for(c = 0, d = r->st->dimensions; d ;c++, d = d->next) {
+        if(    (match_ids   && simple_pattern_matches(pattern, d->id))
+               || (match_names && simple_pattern_matches(pattern, d->name))
+                ) {
+            r->od[c] |= RRDR_DIMENSION_SELECTED;
+            if(unlikely(r->od[c] & RRDR_DIMENSION_HIDDEN)) r->od[c] &= ~RRDR_DIMENSION_HIDDEN;
+            dims_selected++;
+
+            // since the user needs this dimension
+            // make it appear as NONZERO, to return it
+            // even if the dimension has only zeros
+            // unless option non_zero is set
+            if(unlikely(!(options & RRDR_OPTION_NONZERO)))
+                r->od[c] |= RRDR_DIMENSION_NONZERO;
+
+            // count the visible dimensions
+            if(likely(r->od[c] & RRDR_DIMENSION_NONZERO))
+                dims_not_hidden_not_zero++;
+        }
+        else {
+            r->od[c] |= RRDR_DIMENSION_HIDDEN;
+            if(unlikely(r->od[c] & RRDR_DIMENSION_SELECTED)) r->od[c] &= ~RRDR_DIMENSION_SELECTED;
+        }
+    }
+    simple_pattern_free(pattern);
+
+    // check if all dimensions are hidden
+    if(unlikely(!dims_not_hidden_not_zero && dims_selected)) {
+        // there are a few selected dimensions
+        // but they are all zero
+        // enable the selected ones
+        // to avoid returning an empty chart
+        for(c = 0, d = r->st->dimensions; d ;c++, d = d->next)
+            if(unlikely(r->od[c] & RRDR_DIMENSION_SELECTED))
+                r->od[c] |= RRDR_DIMENSION_NONZERO;
+    }
+}
+
+// ----------------------------------------------------------------------------
+// helpers to find our way in RRDR
+
+static inline RRDR_VALUE_FLAGS *rrdr_line_options(RRDR *r, long rrdr_line) {
+    return &r->o[ rrdr_line * r->d ];
+}
+
+static inline calculated_number *rrdr_line_values(RRDR *r, long rrdr_line) {
+    return &r->v[ rrdr_line * r->d ];
+}
+
+static inline long rrdr_line_init(RRDR *r, time_t t, long rrdr_line) {
+    rrdr_line++;
+
+    #ifdef NETDATA_INTERNAL_CHECKS
+
+    if(unlikely(rrdr_line >= r->n))
+        error("INTERNAL ERROR: requested to step above RRDR size for chart '%s'", r->st->name);
+
+    if(unlikely(r->t[rrdr_line] != 0 && r->t[rrdr_line] != t))
+        error("INTERNAL ERROR: overwriting the timestamp of RRDR line %zu from %zu to %zu, of chart '%s'", (size_t)rrdr_line, (size_t)r->t[rrdr_line], (size_t)t, r->st->name);
+
+    #endif
+
+    // save the time
+    r->t[rrdr_line] = t;
+
+    return rrdr_line;
+}
+
+static inline void rrdr_done(RRDR *r, long rrdr_line) {
+    r->rows = rrdr_line + 1;
+}
+
+
+// ----------------------------------------------------------------------------
+// fill RRDR for a single dimension
+
+static inline void do_dimension(
+          RRDR *r
+        , long points_wanted
+        , RRDDIM *rd
+        , long dim_id_in_rrdr
+        , long after_slot
+        , long before_slot
+        , time_t after_wanted
+        , time_t before_wanted
+){
+    (void) before_slot;
+
+    RRDSET *st = r->st;
+
+    time_t
+        now = after_wanted,
+        dt = st->update_every,
+        max_date = 0,
+        min_date = 0;
+
+    long
+        slot = after_slot,
+        group_size = r->group,
+        points_added = 0,
+        values_in_group = 0,
+        values_in_group_non_zero = 0,
+        rrdr_line = -1,
+        entries = st->entries;
+
+    RRDR_VALUE_FLAGS
+        group_value_flags = RRDR_VALUE_NOTHING;
+
+    calculated_number min = r->min, max = r->max;
+    size_t db_points_read = 0;
+    for( ; points_added < points_wanted ; now += dt, slot++ ) {
+        if(unlikely(slot >= entries)) slot = 0;
+
+        // make sure we return data in the proper time range
+        if(unlikely(now > before_wanted)) {
+            #ifdef NETDATA_INTERNAL_CHECKS
+            r->internal.log = "stopped, because attempted to access the db after 'wanted before'";
+            #endif
+            break;
+        }
+        if(unlikely(now < after_wanted)) {
+            #ifdef NETDATA_INTERNAL_CHECKS
+            r->internal.log = "skipped, because attempted to access the db before 'wanted after'";
+            #endif
+            continue;
+        }
+
+        // read the value from the database
+        storage_number n = rd->values[slot];
+        calculated_number value = NAN;
+        if(likely(does_storage_number_exist(n))) {
+
+            value = unpack_storage_number(n);
+            if(likely(value != 0.0))
+                values_in_group_non_zero++;
+
+            if(unlikely(did_storage_number_reset(n)))
+                group_value_flags |= RRDR_VALUE_RESET;
+
+        }
+
+        // add this value for grouping
+        r->internal.grouping_add(r, value);
+        values_in_group++;
+        db_points_read++;
+
+        if(unlikely(values_in_group == group_size)) {
+            rrdr_line = rrdr_line_init(r, now, rrdr_line);
+
+            if(unlikely(!min_date)) min_date = now;
+            max_date = now;
+
+            // find the place to store our values
+            RRDR_VALUE_FLAGS *rrdr_value_options_ptr = &r->o[rrdr_line * r->d + dim_id_in_rrdr];
+
+            // update the dimension options
+            if(likely(values_in_group_non_zero))
+                r->od[dim_id_in_rrdr] |= RRDR_DIMENSION_NONZERO;
+
+            // store the specific point options
+            *rrdr_value_options_ptr = group_value_flags;
+
+            // store the value
+            calculated_number value = r->internal.grouping_flush(r, rrdr_value_options_ptr);
+            r->v[rrdr_line * r->d + dim_id_in_rrdr] = value;
+
+            if(likely(points_added || dim_id_in_rrdr)) {
+                // find the min/max across all dimensions
+
+                if(unlikely(value < min)) min = value;
+                if(unlikely(value > max)) max = value;
+
+            }
+            else {
+                // runs only when dim_id_in_rrdr == 0 && points_added == 0
+                // so, on the first point added for the query.
+                min = max = value;
+            }
+
+            points_added++;
+            values_in_group = 0;
+            group_value_flags = RRDR_VALUE_NOTHING;
+            values_in_group_non_zero = 0;
+        }
+    }
+
+    r->internal.db_points_read += db_points_read;
+    r->internal.result_points_generated += points_added;
+
+    r->min = min;
+    r->max = max;
+    r->before = max_date;
+    r->after = min_date;
+    rrdr_done(r, rrdr_line);
+
+    #ifdef NETDATA_INTERNAL_CHECKS
+    if(unlikely(r->rows != points_added))
+        error("INTERNAL ERROR: %s.%s added %zu rows, but RRDR says I added %zu.", r->st->name, rd->name, (size_t)points_added, (size_t)r->rows);
+    #endif
+}
+
+// ----------------------------------------------------------------------------
+// fill RRDR for the whole chart
+
+#ifdef NETDATA_INTERNAL_CHECKS
+static void rrd2rrdr_log_request_response_metdata(RRDR *r
+        , RRDR_GROUPING group_method
+        , int aligned
+        , long group
+        , long resampling_time
+        , long resampling_group
+        , time_t after_wanted
+        , time_t after_requested
+        , time_t before_wanted
+        , time_t before_requested
+        , long points_requested
+        , long points_wanted
+        , size_t after_slot
+        , size_t before_slot
+        , const char *msg
+        ) {
+    info("INTERNAL ERROR: rrd2rrdr() on %s update every %d with %s grouping %s (group: %ld, resampling_time: %ld, resampling_group: %ld), "
+         "after (got: %zu, want: %zu, req: %zu, db: %zu), "
+         "before (got: %zu, want: %zu, req: %zu, db: %zu), "
+         "duration (got: %zu, want: %zu, req: %zu, db: %zu), "
+         "slot (after: %zu, before: %zu, delta: %zu), "
+         "points (got: %ld, want: %ld, req: %ld, db: %ld), "
+         "%s"
+         , r->st->name
+         , r->st->update_every
+
+         // grouping
+         , (aligned) ? "aligned" : "unaligned"
+         , group_method2string(group_method)
+         , group
+         , resampling_time
+         , resampling_group
+
+         // after
+         , (size_t)r->after - (group - 1) * r->st->update_every
+         , (size_t)after_wanted
+         , (size_t)after_requested
+         , (size_t)rrdset_first_entry_t(r->st)
+
+         // before
+         , (size_t)r->before
+         , (size_t)before_wanted
+         , (size_t)before_requested
+         , (size_t)rrdset_last_entry_t(r->st)
+
+         // duration
+         , (size_t)(r->before - r->after + r->st->update_every)
+         , (size_t)(before_wanted - after_wanted + r->st->update_every)
+         , (size_t)(before_requested - after_requested)
+         , (size_t)((rrdset_last_entry_t(r->st) - rrdset_first_entry_t(r->st)) + r->st->update_every)
+
+         // slot
+         , after_slot
+         , before_slot
+         , (after_slot > before_slot) ? (r->st->entries - after_slot + before_slot) : (before_slot - after_slot)
+
+         // points
+         , r->rows
+         , points_wanted
+         , points_requested
+         , r->st->entries
+
+         // message
+         , msg
+    );
+}
+#endif // NETDATA_INTERNAL_CHECKS
+
+RRDR *rrd2rrdr(
+        RRDSET *st
+        , long points_requested
+        , long long after_requested
+        , long long before_requested
+        , RRDR_GROUPING group_method
+        , long resampling_time_requested
+        , RRDR_OPTIONS options
+        , const char *dimensions
+) {
+    int aligned = !(options & RRDR_OPTION_NOT_ALIGNED);
+
+    int absolute_period_requested = -1;
+
+    time_t first_entry_t = rrdset_first_entry_t(st);
+    time_t last_entry_t  = rrdset_last_entry_t(st);
+
+    if(before_requested == 0 && after_requested == 0) {
+        // dump the all the data
+        before_requested = last_entry_t;
+        after_requested = first_entry_t;
+        absolute_period_requested = 0;
+    }
+
+    // allow relative for before (smaller than API_RELATIVE_TIME_MAX)
+    if(((before_requested < 0)?-before_requested:before_requested) <= API_RELATIVE_TIME_MAX) {
+        if(abs(before_requested) % st->update_every) {
+            // make sure it is multiple of st->update_every
+            if(before_requested < 0) before_requested = before_requested - st->update_every - before_requested % st->update_every;
+            else           before_requested = before_requested + st->update_every - before_requested % st->update_every;
+        }
+        if(before_requested > 0) before_requested = first_entry_t + before_requested;
+        else           before_requested = last_entry_t  + before_requested;
+        absolute_period_requested = 0;
+    }
+
+    // allow relative for after (smaller than API_RELATIVE_TIME_MAX)
+    if(((after_requested < 0)?-after_requested:after_requested) <= API_RELATIVE_TIME_MAX) {
+        if(after_requested == 0) after_requested = -st->update_every;
+        if(abs(after_requested) % st->update_every) {
+            // make sure it is multiple of st->update_every
+            if(after_requested < 0) after_requested = after_requested - st->update_every - after_requested % st->update_every;
+            else          after_requested = after_requested + st->update_every - after_requested % st->update_every;
+        }
+        after_requested = before_requested + after_requested;
+        absolute_period_requested = 0;
+    }
+
+    if(absolute_period_requested == -1)
+        absolute_period_requested = 1;
+
+    // make sure they are within our timeframe
+    if(before_requested > last_entry_t)  before_requested = last_entry_t;
+    if(before_requested < first_entry_t) before_requested = first_entry_t;
+
+    if(after_requested > last_entry_t)  after_requested = last_entry_t;
+    if(after_requested < first_entry_t) after_requested = first_entry_t;
+
+    // check if they are reversed
+    if(after_requested > before_requested) {
+        time_t tmp = before_requested;
+        before_requested = after_requested;
+        after_requested = tmp;
+    }
+
+    // the duration of the chart
+    time_t duration = before_requested - after_requested;
+    long available_points = duration / st->update_every;
+
+    if(duration <= 0 || available_points <= 0)
+        return rrdr_create(st, 1);
+
+    // check the number of wanted points in the result
+    if(unlikely(points_requested < 0)) points_requested = -points_requested;
+    if(unlikely(points_requested > available_points)) points_requested = available_points;
+    if(unlikely(points_requested == 0)) points_requested = available_points;
+
+    // calculate the desired grouping of source data points
+    long group = available_points / points_requested;
+    if(unlikely(group <= 0)) group = 1;
+    if(unlikely(available_points % points_requested > points_requested / 2)) group++; // rounding to the closest integer
+
+    // resampling_time_requested enforces a certain grouping multiple
+    calculated_number resampling_divisor = 1.0;
+    long resampling_group = 1;
+    if(unlikely(resampling_time_requested > st->update_every)) {
+        if (unlikely(resampling_time_requested > duration)) {
+            // group_time is above the available duration
+
+            #ifdef NETDATA_INTERNAL_CHECKS
+            info("INTERNAL CHECK: %s: requested gtime %ld secs, is greater than the desired duration %ld secs", st->id, resampling_time_requested, duration);
+            #endif
+
+            group = available_points; // use all the points
+        }
+        else {
+            // the points we should group to satisfy gtime
+            resampling_group = resampling_time_requested / st->update_every;
+            if(unlikely(resampling_time_requested % st->update_every)) {
+                #ifdef NETDATA_INTERNAL_CHECKS
+                info("INTERNAL CHECK: %s: requested gtime %ld secs, is not a multiple of the chart's data collection frequency %d secs", st->id, resampling_time_requested, st->update_every);
+                #endif
+
+                resampling_group++;
+            }
+
+            // adapt group according to resampling_group
+            if(unlikely(group < resampling_group)) group  = resampling_group; // do not allow grouping below the desired one
+            if(unlikely(group % resampling_group)) group += resampling_group - (group % resampling_group); // make sure group is multiple of resampling_group
+
+            //resampling_divisor = group / resampling_group;
+            resampling_divisor = (calculated_number)(group * st->update_every) / (calculated_number)resampling_time_requested;
+        }
+    }
+
+    // now that we have group,
+    // align the requested timeframe to fit it.
+
+    if(aligned) {
+        // alignement has been requested, so align the values
+        before_requested -= (before_requested % group);
+        after_requested  -= (after_requested % group);
+    }
+
+    // we align the request on requested_before
+    time_t before_wanted = before_requested;
+    if(likely(before_wanted > last_entry_t)) {
+        #ifdef NETDATA_INTERNAL_CHECKS
+        error("INTERNAL ERROR: rrd2rrdr() on %s, before_wanted is after db max", st->name);
+        #endif
+
+        before_wanted = last_entry_t - (last_entry_t % ( ((aligned)?group:1) * st->update_every ));
+    }
+    size_t before_slot = rrdset_time2slot(st, before_wanted);
+
+    // we need to estimate the number of points, for having
+    // an integer number of values per point
+    long points_wanted = (before_wanted - after_requested) / st->update_every / group;
+
+    time_t after_wanted  = before_wanted - (points_wanted * group * st->update_every) + st->update_every;
+    if(unlikely(after_wanted < first_entry_t)) {
+        // hm... we go to the past, calculate again points_wanted using all the db from before_wanted to the beginning
+        points_wanted = (before_wanted - first_entry_t) / group;
+
+        // recalculate after wanted with the new number of points
+        after_wanted  = before_wanted - (points_wanted * group * st->update_every) + st->update_every;
+
+        if(unlikely(after_wanted < first_entry_t)) {
+            #ifdef NETDATA_INTERNAL_CHECKS
+            error("INTERNAL ERROR: rrd2rrdr() on %s, after_wanted is before db min", st->name);
+            #endif
+
+            after_wanted = first_entry_t - (first_entry_t % ( ((aligned)?group:1) * st->update_every )) + ( ((aligned)?group:1) * st->update_every );
+        }
+    }
+    size_t after_slot  = rrdset_time2slot(st, after_wanted);
+
+    // check if they are reversed
+    if(unlikely(after_wanted > before_wanted)) {
+        #ifdef NETDATA_INTERNAL_CHECKS
+        error("INTERNAL ERROR: rrd2rrdr() on %s, reversed wanted after/before", st->name);
+        #endif
+        time_t tmp = before_wanted;
+        before_wanted = after_wanted;
+        after_wanted = tmp;
+    }
+
+    // recalculate points_wanted using the final time-frame
+    points_wanted   = (before_wanted - after_wanted) / st->update_every / group + 1;
+    if(unlikely(points_wanted < 0)) {
+        #ifdef NETDATA_INTERNAL_CHECKS
+        error("INTERNAL ERROR: rrd2rrdr() on %s, points_wanted is %ld", st->name, points_wanted);
+        #endif
+        points_wanted = 0;
+    }
+
+#ifdef NETDATA_INTERNAL_CHECKS
+    duration = before_wanted - after_wanted;
+
+    if(after_wanted < first_entry_t)
+        error("INTERNAL CHECK: after_wanted %u is too small, minimum %u", (uint32_t)after_wanted, (uint32_t)first_entry_t);
+
+    if(after_wanted > last_entry_t)
+        error("INTERNAL CHECK: after_wanted %u is too big, maximum %u", (uint32_t)after_wanted, (uint32_t)last_entry_t);
+
+    if(before_wanted < first_entry_t)
+        error("INTERNAL CHECK: before_wanted %u is too small, minimum %u", (uint32_t)before_wanted, (uint32_t)first_entry_t);
+
+    if(before_wanted > last_entry_t)
+        error("INTERNAL CHECK: before_wanted %u is too big, maximum %u", (uint32_t)before_wanted, (uint32_t)last_entry_t);
+
+    if(before_slot >= (size_t)st->entries)
+        error("INTERNAL CHECK: before_slot is invalid %zu, expected 0 to %ld", before_slot, st->entries - 1);
+
+    if(after_slot >= (size_t)st->entries)
+        error("INTERNAL CHECK: after_slot is invalid %zu, expected 0 to %ld", after_slot, st->entries - 1);
+
+    if(points_wanted > (before_wanted - after_wanted) / group / st->update_every + 1)
+        error("INTERNAL CHECK: points_wanted %ld is more than points %ld", points_wanted, (before_wanted - after_wanted) / group / st->update_every + 1);
+
+    if(group < resampling_group)
+        error("INTERNAL CHECK: group %ld is less than the desired group points %ld", group, resampling_group);
+
+    if(group > resampling_group && group % resampling_group)
+        error("INTERNAL CHECK: group %ld is not a multiple of the desired group points %ld", group, resampling_group);
+#endif
+
+    // -------------------------------------------------------------------------
+    // initialize our result set
+    // this also locks the chart for us
+
+    RRDR *r = rrdr_create(st, points_wanted);
+    if(unlikely(!r)) {
+        #ifdef NETDATA_INTERNAL_CHECKS
+        error("INTERNAL CHECK: Cannot create RRDR for %s, after=%u, before=%u, duration=%u, points=%ld", st->id, (uint32_t)after_wanted, (uint32_t)before_wanted, (uint32_t)duration, points_wanted);
+        #endif
+        return NULL;
+    }
+
+    if(unlikely(!r->d || !points_wanted)) {
+        #ifdef NETDATA_INTERNAL_CHECKS
+        error("INTERNAL CHECK: Returning empty RRDR (no dimensions in RRDSET) for %s, after=%u, before=%u, duration=%zu, points=%ld", st->id, (uint32_t)after_wanted, (uint32_t)before_wanted, (size_t)duration, points_wanted);
+        #endif
+        return r;
+    }
+
+    if(unlikely(absolute_period_requested == 1))
+        r->result_options |= RRDR_RESULT_OPTION_ABSOLUTE;
+    else
+        r->result_options |= RRDR_RESULT_OPTION_RELATIVE;
+
+    // find how many dimensions we have
+    long dimensions_count = r->d;
+
+    // -------------------------------------------------------------------------
+    // initialize RRDR
+
+    r->group = group;
+    r->update_every = (int)group * st->update_every;
+    r->before = before_wanted;
+    r->after = after_wanted;
+    r->internal.points_wanted = points_wanted;
+    r->internal.resampling_group = resampling_group;
+    r->internal.resampling_divisor = resampling_divisor;
+
+
+    // -------------------------------------------------------------------------
+    // assign the processor functions
+
+    {
+        int i, found = 0;
+        for(i = 0; !found && api_v1_data_groups[i].name ;i++) {
+            if(api_v1_data_groups[i].value == group_method) {
+                r->internal.grouping_create= api_v1_data_groups[i].create;
+                r->internal.grouping_reset = api_v1_data_groups[i].reset;
+                r->internal.grouping_free  = api_v1_data_groups[i].free;
+                r->internal.grouping_add   = api_v1_data_groups[i].add;
+                r->internal.grouping_flush = api_v1_data_groups[i].flush;
+                found = 1;
+            }
+        }
+        if(!found) {
+            errno = 0;
+            #ifdef NETDATA_INTERNAL_CHECKS
+            error("INTERNAL ERROR: grouping method %u not found for chart '%s'. Using 'average'", (unsigned int)group_method, r->st->name);
+            #endif
+            r->internal.grouping_create= grouping_create_average;
+            r->internal.grouping_reset = grouping_reset_average;
+            r->internal.grouping_free  = grouping_free_average;
+            r->internal.grouping_add   = grouping_add_average;
+            r->internal.grouping_flush = grouping_flush_average;
+        }
+    }
+
+    // allocate any memory required by the grouping method
+    r->internal.grouping_data = r->internal.grouping_create(r);
+
+
+    // -------------------------------------------------------------------------
+    // disable the not-wanted dimensions
+
+    rrdset_check_rdlock(st);
+
+    if(dimensions)
+        rrdr_disable_not_selected_dimensions(r, options, dimensions);
+
+
+    // -------------------------------------------------------------------------
+    // do the work for each dimension
+
+    time_t max_after = 0, min_before = 0;
+    long max_rows = 0;
+
+    RRDDIM *rd;
+    long c, dimensions_used = 0, dimensions_nonzero = 0;
+    for(rd = st->dimensions, c = 0 ; rd && c < dimensions_count ; rd = rd->next, c++) {
+
+        // if we need a percentage, we need to calculate all dimensions
+        if(unlikely(!(options & RRDR_OPTION_PERCENTAGE) && (r->od[c] & RRDR_DIMENSION_HIDDEN))) {
+            if(unlikely(r->od[c] & RRDR_DIMENSION_SELECTED)) r->od[c] &= ~RRDR_DIMENSION_SELECTED;
+            continue;
+        }
+        r->od[c] |= RRDR_DIMENSION_SELECTED;
+
+        // reset the grouping for the new dimension
+        r->internal.grouping_reset(r);
+
+        do_dimension(
+                r
+                , points_wanted
+                , rd
+                , c
+                , after_slot
+                , before_slot
+                , after_wanted
+                , before_wanted
+                );
+
+        if(r->od[c] & RRDR_DIMENSION_NONZERO)
+            dimensions_nonzero++;
+
+        // verify all dimensions are aligned
+        if(unlikely(!dimensions_used)) {
+            min_before = r->before;
+            max_after = r->after;
+            max_rows = r->rows;
+        }
+        else {
+            if(r->after != max_after) {
+                #ifdef NETDATA_INTERNAL_CHECKS
+                error("INTERNAL ERROR: 'after' mismatch between dimensions for chart '%s': max is %zu, dimension '%s' has %zu",
+                        st->name, (size_t)max_after, rd->name, (size_t)r->after);
+                #endif
+                r->after = (r->after > max_after) ? r->after : max_after;
+            }
+
+            if(r->before != min_before) {
+                #ifdef NETDATA_INTERNAL_CHECKS
+                error("INTERNAL ERROR: 'before' mismatch between dimensions for chart '%s': max is %zu, dimension '%s' has %zu",
+                        st->name, (size_t)min_before, rd->name, (size_t)r->before);
+                #endif
+                r->before = (r->before < min_before) ? r->before : min_before;
+            }
+
+            if(r->rows != max_rows) {
+                #ifdef NETDATA_INTERNAL_CHECKS
+                error("INTERNAL ERROR: 'rows' mismatch between dimensions for chart '%s': max is %zu, dimension '%s' has %zu",
+                        st->name, (size_t)max_rows, rd->name, (size_t)r->rows);
+                #endif
+                r->rows = (r->rows > max_rows) ? r->rows : max_rows;
+            }
+        }
+
+        dimensions_used++;
+    }
+
+    #ifdef NETDATA_INTERNAL_CHECKS
+
+    if(r->internal.log)
+        rrd2rrdr_log_request_response_metdata(r, group_method, aligned, group, resampling_time_requested, resampling_group, after_wanted, after_requested, before_wanted, before_requested, points_requested, points_wanted, after_slot, before_slot, r->internal.log);
+
+    if(r->rows != points_wanted)
+        rrd2rrdr_log_request_response_metdata(r, group_method, aligned, group, resampling_time_requested, resampling_group, after_wanted, after_requested, before_wanted, before_requested, points_requested, points_wanted, after_slot, before_slot, "got 'points' is not wanted 'points'");
+
+    if(aligned && (r->before % group) != 0)
+        rrd2rrdr_log_request_response_metdata(r, group_method, aligned, group, resampling_time_requested, resampling_group, after_wanted, after_requested, before_wanted, before_requested, points_requested, points_wanted, after_slot, before_slot, "'before' is not aligned but alignment is required");
+
+    // 'after' should not be aligned, since we start inside the first group
+    //if(aligned && (r->after % group) != 0)
+    //    rrd2rrdr_log_request_response_metdata(r, group_method, aligned, group, resampling_time_requested, resampling_group, after_wanted, after_requested, before_wanted, before_requested, points_requested, points_wanted, after_slot, before_slot, "'after' is not aligned but alignment is required");
+
+    if(r->before != before_requested)
+        rrd2rrdr_log_request_response_metdata(r, group_method, aligned, group, resampling_time_requested, resampling_group, after_wanted, after_requested, before_wanted, before_requested, points_requested, points_wanted, after_slot, before_slot, "chart is not aligned to requested 'before'");
+
+    if(r->before != before_wanted)
+        rrd2rrdr_log_request_response_metdata(r, group_method, aligned, group, resampling_time_requested, resampling_group, after_wanted, after_requested, before_wanted, before_requested, points_requested, points_wanted, after_slot, before_slot, "got 'before' is not wanted 'before'");
+
+    // reported 'after' varies, depending on group
+    if((r->after - (group - 1) * r->st->update_every) != after_wanted)
+        rrd2rrdr_log_request_response_metdata(r, group_method, aligned, group, resampling_time_requested, resampling_group, after_wanted, after_requested, before_wanted, before_requested, points_requested, points_wanted, after_slot, before_slot, "got 'after' is not wanted 'after'");
+
+    #endif
+
+    // free all resources used by the grouping method
+    r->internal.grouping_free(r);
+
+    // when all the dimensions are zero, we should return all of them
+    if(unlikely(options & RRDR_OPTION_NONZERO && !dimensions_nonzero)) {
+        // all the dimensions are zero
+        // mark them as NONZERO to send them all
+        for(rd = st->dimensions, c = 0 ; rd && c < dimensions_count ; rd = rd->next, c++) {
+            if(unlikely(r->od[c] & RRDR_DIMENSION_HIDDEN)) continue;
+            r->od[c] |= RRDR_DIMENSION_NONZERO;
+        }
+    }
+
+    rrdr_query_completed(r->internal.db_points_read, r->internal.result_points_generated);
+    return r;
+}
diff --git a/web/api/queries/query.h b/web/api/queries/query.h
new file mode 100644
index 000000000..6b8a51c58
--- /dev/null
+++ b/web/api/queries/query.h
@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_API_DATA_QUERY_H
+#define NETDATA_API_DATA_QUERY_H
+
+typedef enum rrdr_grouping {
+    RRDR_GROUPING_UNDEFINED = 0,
+    RRDR_GROUPING_AVERAGE,
+    RRDR_GROUPING_MIN,
+    RRDR_GROUPING_MAX,
+    RRDR_GROUPING_SUM,
+    RRDR_GROUPING_INCREMENTAL_SUM,
+    RRDR_GROUPING_MEDIAN,
+    RRDR_GROUPING_STDDEV,
+    RRDR_GROUPING_CV,
+    RRDR_GROUPING_SES,
+    RRDR_GROUPING_DES,
+} RRDR_GROUPING;
+
+extern const char *group_method2string(RRDR_GROUPING group);
+extern void web_client_api_v1_init_grouping(void);
+extern RRDR_GROUPING web_client_api_request_v1_data_group(const char *name, RRDR_GROUPING def);
+
+#endif //NETDATA_API_DATA_QUERY_H
diff --git a/web/api/queries/rrdr.c b/web/api/queries/rrdr.c
new file mode 100644
index 000000000..e727e607e
--- /dev/null
+++ b/web/api/queries/rrdr.c
@@ -0,0 +1,136 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "rrdr.h"
+
+/*
+static void rrdr_dump(RRDR *r)
+{
+    long c, i;
+    RRDDIM *d;
+
+    fprintf(stderr, "\nCHART %s (%s)\n", r->st->id, r->st->name);
+
+    for(c = 0, d = r->st->dimensions; d ;c++, d = d->next) {
+        fprintf(stderr, "DIMENSION %s (%s), %s%s%s%s\n"
+                , d->id
+                , d->name
+                , (r->od[c] & RRDR_EMPTY)?"EMPTY ":""
+                , (r->od[c] & RRDR_RESET)?"RESET ":""
+                , (r->od[c] & RRDR_DIMENSION_HIDDEN)?"HIDDEN ":""
+                , (r->od[c] & RRDR_DIMENSION_NONZERO)?"NONZERO ":""
+                );
+    }
+
+    if(r->rows <= 0) {
+        fprintf(stderr, "RRDR does not have any values in it.\n");
+        return;
+    }
+
+    fprintf(stderr, "RRDR includes %d values in it:\n", r->rows);
+
+    // for each line in the array
+    for(i = 0; i < r->rows ;i++) {
+        calculated_number *cn = &r->v[ i * r->d ];
+        RRDR_DIMENSION_FLAGS *co = &r->o[ i * r->d ];
+
+        // print the id and the timestamp of the line
+        fprintf(stderr, "%ld %ld ", i + 1, r->t[i]);
+
+        // for each dimension
+        for(c = 0, d = r->st->dimensions; d ;c++, d = d->next) {
+            if(unlikely(r->od[c] & RRDR_DIMENSION_HIDDEN)) continue;
+            if(unlikely(!(r->od[c] & RRDR_DIMENSION_NONZERO))) continue;
+
+            if(co[c] & RRDR_EMPTY)
+                fprintf(stderr, "null ");
+            else
+                fprintf(stderr, CALCULATED_NUMBER_FORMAT " %s%s%s%s "
+                    , cn[c]
+                    , (co[c] & RRDR_EMPTY)?"E":" "
+                    , (co[c] & RRDR_RESET)?"R":" "
+                    , (co[c] & RRDR_DIMENSION_HIDDEN)?"H":" "
+                    , (co[c] & RRDR_DIMENSION_NONZERO)?"N":" "
+                    );
+        }
+
+        fprintf(stderr, "\n");
+    }
+}
+*/
+
+
+
+
+inline static void rrdr_lock_rrdset(RRDR *r) {
+    if(unlikely(!r)) {
+        error("NULL value given!");
+        return;
+    }
+
+    rrdset_rdlock(r->st);
+    r->has_st_lock = 1;
+}
+
+inline static void rrdr_unlock_rrdset(RRDR *r) {
+    if(unlikely(!r)) {
+        error("NULL value given!");
+        return;
+    }
+
+    if(likely(r->has_st_lock)) {
+        rrdset_unlock(r->st);
+        r->has_st_lock = 0;
+    }
+}
+
+inline void rrdr_free(RRDR *r)
+{
+    if(unlikely(!r)) {
+        error("NULL value given!");
+        return;
+    }
+
+    rrdr_unlock_rrdset(r);
+    freez(r->t);
+    freez(r->v);
+    freez(r->o);
+    freez(r->od);
+    freez(r);
+}
+
+RRDR *rrdr_create(RRDSET *st, long n)
+{
+    if(unlikely(!st)) {
+        error("NULL value given!");
+        return NULL;
+    }
+
+    RRDR *r = callocz(1, sizeof(RRDR));
+    r->st = st;
+
+    rrdr_lock_rrdset(r);
+
+    RRDDIM *rd;
+    rrddim_foreach_read(rd, st) r->d++;
+
+    r->n = n;
+
+    r->t = callocz((size_t)n, sizeof(time_t));
+    r->v = mallocz(n * r->d * sizeof(calculated_number));
+    r->o = mallocz(n * r->d * sizeof(RRDR_VALUE_FLAGS));
+    r->od = mallocz(r->d * sizeof(RRDR_DIMENSION_FLAGS));
+
+    // set the hidden flag on hidden dimensions
+    int c;
+    for(c = 0, rd = st->dimensions ; rd ; c++, rd = rd->next) {
+        if(unlikely(rrddim_flag_check(rd, RRDDIM_FLAG_HIDDEN)))
+            r->od[c] = RRDR_DIMENSION_HIDDEN;
+        else
+            r->od[c] = RRDR_DIMENSION_DEFAULT;
+    }
+
+    r->group = 1;
+    r->update_every = 1;
+
+    return r;
+}
diff --git a/web/api/queries/rrdr.h b/web/api/queries/rrdr.h
new file mode 100644
index 000000000..4f6350389
--- /dev/null
+++ b/web/api/queries/rrdr.h
@@ -0,0 +1,106 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_QUERIES_RRDR_H
+#define NETDATA_QUERIES_RRDR_H
+
+#include "libnetdata/libnetdata.h"
+
+typedef enum rrdr_options {
+    RRDR_OPTION_NONZERO      = 0x00000001, // don't output dimensions will just zero values
+    RRDR_OPTION_REVERSED     = 0x00000002, // output the rows in reverse order (oldest to newest)
+    RRDR_OPTION_ABSOLUTE     = 0x00000004, // values positive, for DATASOURCE_SSV before summing
+    RRDR_OPTION_MIN2MAX      = 0x00000008, // when adding dimensions, use max - min, instead of sum
+    RRDR_OPTION_SECONDS      = 0x00000010, // output seconds, instead of dates
+    RRDR_OPTION_MILLISECONDS = 0x00000020, // output milliseconds, instead of dates
+    RRDR_OPTION_NULL2ZERO    = 0x00000040, // do not show nulls, convert them to zeros
+    RRDR_OPTION_OBJECTSROWS  = 0x00000080, // each row of values should be an object, not an array
+    RRDR_OPTION_GOOGLE_JSON  = 0x00000100, // comply with google JSON/JSONP specs
+    RRDR_OPTION_JSON_WRAP    = 0x00000200, // wrap the response in a JSON header with info about the result
+    RRDR_OPTION_LABEL_QUOTES = 0x00000400, // in CSV output, wrap header labels in double quotes
+    RRDR_OPTION_PERCENTAGE   = 0x00000800, // give values as percentage of total
+    RRDR_OPTION_NOT_ALIGNED  = 0x00001000, // do not align charts for persistant timeframes
+    RRDR_OPTION_DISPLAY_ABS  = 0x00002000, // for badges, display the absolute value, but calculate colors with sign
+    RRDR_OPTION_MATCH_IDS    = 0x00004000, // when filtering dimensions, match only IDs
+    RRDR_OPTION_MATCH_NAMES  = 0x00008000, // when filtering dimensions, match only names
+} RRDR_OPTIONS;
+
+typedef enum rrdr_value_flag {
+    RRDR_VALUE_NOTHING      = 0x00, // no flag set (a good default)
+    RRDR_VALUE_EMPTY        = 0x01, // the database value is empty
+    RRDR_VALUE_RESET        = 0x02, // the database value is marked as reset (overflown)
+} RRDR_VALUE_FLAGS;
+
+typedef enum rrdr_dimension_flag {
+    RRDR_DIMENSION_DEFAULT  = 0x00,
+    RRDR_DIMENSION_HIDDEN   = 0x04, // the dimension is hidden (not to be presented to callers)
+    RRDR_DIMENSION_NONZERO  = 0x08, // the dimension is non zero (contains non-zero values)
+    RRDR_DIMENSION_SELECTED = 0x10, // the dimension is selected for evaluation in this RRDR
+} RRDR_DIMENSION_FLAGS;
+
+// RRDR result options
+typedef enum rrdr_result_flags {
+    RRDR_RESULT_OPTION_ABSOLUTE = 0x00000001, // the query uses absolute time-frames (can be cached by browsers and proxies)
+    RRDR_RESULT_OPTION_RELATIVE = 0x00000002, // the query uses relative time-frames (should not to be cached by browsers and proxies)
+} RRDR_RESULT_FLAGS;
+
+typedef struct rrdresult {
+    struct rrdset *st;         // the chart this result refers to
+
+    RRDR_RESULT_FLAGS result_options; // RRDR_RESULT_OPTION_*
+
+    int d;                    // the number of dimensions
+    long n;                   // the number of values in the arrays
+    long rows;                // the number of rows used
+
+    RRDR_DIMENSION_FLAGS *od; // the options for the dimensions
+
+    time_t *t;                // array of n timestamps
+    calculated_number *v;     // array n x d values
+    RRDR_VALUE_FLAGS *o;      // array n x d options for each value returned
+
+    long group;               // how many collected values were grouped for each row
+    int update_every;         // what is the suggested update frequency in seconds
+
+    calculated_number min;
+    calculated_number max;
+
+    time_t before;
+    time_t after;
+
+    int has_st_lock;        // if st is read locked by us
+
+    // internal rrd2rrdr() members below this point
+    struct {
+        long points_wanted;
+        long resampling_group;
+        calculated_number resampling_divisor;
+
+        void *(*grouping_create)(struct rrdresult *r);
+        void (*grouping_reset)(struct rrdresult *r);
+        void (*grouping_free)(struct rrdresult *r);
+        void (*grouping_add)(struct rrdresult *r, calculated_number value);
+        calculated_number (*grouping_flush)(struct rrdresult *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr);
+        void *grouping_data;
+
+        #ifdef NETDATA_INTERNAL_CHECKS
+        const char *log;
+        #endif
+
+        size_t db_points_read;
+        size_t result_points_generated;
+    } internal;
+} RRDR;
+
+#define rrdr_rows(r) ((r)->rows)
+
+extern void rrdr_free(RRDR *r);
+extern RRDR *rrdr_create(struct rrdset *st, long n);
+
+#include "../web_api_v1.h"
+#include "web/api/queries/query.h"
+
+extern RRDR *rrd2rrdr(RRDSET *st, long points_requested, long long after_requested, long long before_requested, RRDR_GROUPING group_method, long resampling_time_requested, RRDR_OPTIONS options, const char *dimensions);
+
+#include "query.h"
+
+#endif //NETDATA_QUERIES_RRDR_H
diff --git a/web/api/queries/ses/Makefile.am b/web/api/queries/ses/Makefile.am
new file mode 100644
index 000000000..19554bed8
--- /dev/null
+++ b/web/api/queries/ses/Makefile.am
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+AUTOMAKE_OPTIONS = subdir-objects
+MAINTAINERCLEANFILES = $(srcdir)/Makefile.in
+
+dist_noinst_DATA = \
+	README.md \
+	$(NULL)
diff --git a/web/api/queries/ses/Makefile.in b/web/api/queries/ses/Makefile.in
new file mode 100644
index 000000000..bb538fac3
--- /dev/null
+++ b/web/api/queries/ses/Makefile.in
@@ -0,0 +1,464 @@
+# Makefile.in generated by automake 1.14.1 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2013 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+VPATH = @srcdir@
+am__is_gnu_make = test -n '$(MAKEFILE_LIST)' && test -n '$(MAKELEVEL)'
+am__make_running_with_option = \
+  case $${target_option-} in \
+      ?) ;; \
+      *) echo "am__make_running_with_option: internal error: invalid" \
+              "target option '$${target_option-}' specified" >&2; \
+         exit 1;; \
+  esac; \
+  has_opt=no; \
+  sane_makeflags=$$MAKEFLAGS; \
+  if $(am__is_gnu_make); then \
+    sane_makeflags=$$MFLAGS; \
+  else \
+    case $$MAKEFLAGS in \
+      *\\[\ \	]*) \
+        bs=\\; \
+        sane_makeflags=`printf '%s\n' "$$MAKEFLAGS" \
+          | sed "s/$$bs$$bs[$$bs $$bs	]*//g"`;; \
+    esac; \
+  fi; \
+  skip_next=no; \
+  strip_trailopt () \
+  { \
+    flg=`printf '%s\n' "$$flg" | sed "s/$$1.*$$//"`; \
+  }; \
+  for flg in $$sane_makeflags; do \
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diff --git a/web/api/queries/ses/README.md b/web/api/queries/ses/README.md
new file mode 100644
index 000000000..b5dacea83
--- /dev/null
+++ b/web/api/queries/ses/README.md
@@ -0,0 +1,54 @@
+# Single (or Simple) Exponential Smoothing (`ses`)
+
+> This query is also available as `ema` and `ewma`.
+
+An exponential moving average (`ema`), also known as an exponentially weighted moving average (`ewma`)
+is a first-order infinite impulse response filter that applies weighting factors which decrease
+exponentially. The weighting for each older datum decreases exponentially, never reaching zero.
+
+In simple terms, this is like an average value, but more recent values are given more weight.
+
+Netdata automatically adjusts the weight (`alpha`) based on the number of values processed,
+using the formula:
+
+```
+window = max(number of values, 15)
+alpha  = 2 / (window + 1)
+```
+
+You can change the fixed value `15` by setting in `netdata.conf`:
+
+```
+[web]
+   ses max window = 15
+```
+
+## how to use
+
+Use it in alarms like this:
+
+```
+ alarm: my_alarm
+    on: my_chart
+lookup: ses -1m unaligned of my_dimension
+  warn: $this > 1000
+```
+
+`ses` does not change the units. For example, if the chart units is `requests/sec`, the exponential
+moving average will be again expressed in the same units. 
+
+It can also be used in APIs and badges as `&group=ses` in the URL.
+
+## Examples
+
+Examining last 1 minute `successful` web server responses:
+
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=min&after=-60&label=min)
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=average&after=-60&label=average&value_color=yellow)
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=ses&after=-60&label=single+exponential+smoothing&value_color=orange)
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=max&after=-60&label=max)
+
+## References
+
+- [https://en.wikipedia.org/wiki/Moving_average#exponential-moving-average](https://en.wikipedia.org/wiki/Moving_average#exponential-moving-average)
+- [https://en.wikipedia.org/wiki/Exponential_smoothing](https://en.wikipedia.org/wiki/Exponential_smoothing).
diff --git a/web/api/queries/ses/ses.c b/web/api/queries/ses/ses.c
new file mode 100644
index 000000000..6ea40dfba
--- /dev/null
+++ b/web/api/queries/ses/ses.c
@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "ses.h"
+
+
+// ----------------------------------------------------------------------------
+// single exponential smoothing
+
+struct grouping_ses {
+    calculated_number alpha;
+    calculated_number alpha_other;
+    calculated_number level;
+    size_t count;
+};
+
+static size_t max_window_size = 15;
+
+void grouping_init_ses(void) {
+    long long ret = config_get_number(CONFIG_SECTION_WEB, "ses max window", (long long)max_window_size);
+    if(ret <= 1) {
+        config_set_number(CONFIG_SECTION_WEB, "ses max window", (long long)max_window_size);
+    }
+    else {
+        max_window_size = (size_t) ret;
+    }
+}
+
+static inline calculated_number window(RRDR *r, struct grouping_ses *g) {
+    (void)g;
+
+    calculated_number points;
+    if(r->group == 1) {
+        // provide a running DES
+        points = r->internal.points_wanted;
+    }
+    else {
+        // provide a SES with flush points
+        points = r->group;
+    }
+
+    return (points > max_window_size) ? max_window_size : points;
+}
+
+static inline void set_alpha(RRDR *r, struct grouping_ses *g) {
+    // https://en.wikipedia.org/wiki/Moving_average#Exponential_moving_average
+    // A commonly used value for alpha is 2 / (N + 1)
+    g->alpha = 2.0 / (window(r, g) + 1.0);
+    g->alpha_other = 1.0 - g->alpha;
+}
+
+void *grouping_create_ses(RRDR *r) {
+    struct grouping_ses *g = (struct grouping_ses *)callocz(1, sizeof(struct grouping_ses));
+    set_alpha(r, g);
+    g->level = 0.0;
+    return g;
+}
+
+// resets when switches dimensions
+// so, clear everything to restart
+void grouping_reset_ses(RRDR *r) {
+    struct grouping_ses *g = (struct grouping_ses *)r->internal.grouping_data;
+    g->level = 0.0;
+    g->count = 0;
+}
+
+void grouping_free_ses(RRDR *r) {
+    freez(r->internal.grouping_data);
+    r->internal.grouping_data = NULL;
+}
+
+void grouping_add_ses(RRDR *r, calculated_number value) {
+    struct grouping_ses *g = (struct grouping_ses *)r->internal.grouping_data;
+
+    if(isnormal(value)) {
+        if(unlikely(!g->count))
+            g->level = value;
+
+        g->level = g->alpha * value + g->alpha_other * g->level;
+        g->count++;
+    }
+}
+
+calculated_number grouping_flush_ses(RRDR *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr) {
+    struct grouping_ses *g = (struct grouping_ses *)r->internal.grouping_data;
+
+    if(unlikely(!g->count || !isnormal(g->level))) {
+        *rrdr_value_options_ptr |= RRDR_VALUE_EMPTY;
+        return 0.0;
+    }
+
+    return g->level;
+}
diff --git a/web/api/queries/ses/ses.h b/web/api/queries/ses/ses.h
new file mode 100644
index 000000000..603fdb57c
--- /dev/null
+++ b/web/api/queries/ses/ses.h
@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_API_QUERIES_SES_H
+#define NETDATA_API_QUERIES_SES_H
+
+#include "../query.h"
+#include "../rrdr.h"
+
+extern void grouping_init_ses(void);
+
+extern void *grouping_create_ses(RRDR *r);
+extern void grouping_reset_ses(RRDR *r);
+extern void grouping_free_ses(RRDR *r);
+extern void grouping_add_ses(RRDR *r, calculated_number value);
+extern calculated_number grouping_flush_ses(RRDR *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr);
+
+#endif //NETDATA_API_QUERIES_SES_H
diff --git a/web/api/queries/stddev/Makefile.am b/web/api/queries/stddev/Makefile.am
new file mode 100644
index 000000000..19554bed8
--- /dev/null
+++ b/web/api/queries/stddev/Makefile.am
@@ -0,0 +1,8 @@
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+	README.md \
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new file mode 100644
index 000000000..b7ccdfdca
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+++ b/web/api/queries/stddev/Makefile.in
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diff --git a/web/api/queries/stddev/README.md b/web/api/queries/stddev/README.md
new file mode 100644
index 000000000..3436ff834
--- /dev/null
+++ b/web/api/queries/stddev/README.md
@@ -0,0 +1,87 @@
+
+# standard deviation (`stddev`)
+
+The standard deviation is a measure that is used to quantify the amount of variation or dispersion
+of a set of data values.
+
+A low standard deviation indicates that the data points tend to be close to the mean (also called the
+expected value) of the set, while a high standard deviation indicates that the data points are spread
+out over a wider range of values.
+
+## how to use
+
+Use it in alarms like this:
+
+```
+ alarm: my_alarm
+    on: my_chart
+lookup: stddev -1m unaligned of my_dimension
+  warn: $this > 1000
+```
+
+`stdev` does not change the units. For example, if the chart units is `requests/sec`, the standard
+deviation will be again expressed in the same units. 
+
+It can also be used in APIs and badges as `&group=stddev` in the URL.
+
+## Examples
+
+Examining last 1 minute `successful` web server responses:
+
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&dimensions=success&group=min&after=-60&label=min)
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&dimensions=success&group=average&after=-60&label=average&value_color=yellow)
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&dimensions=success&group=stddev&after=-60&label=standard+deviation&value_color=orange)
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&dimensions=success&group=max&after=-60&label=max)
+
+## References
+
+Check [https://en.wikipedia.org/wiki/Standard_deviation](https://en.wikipedia.org/wiki/Standard_deviation).
+
+---
+
+# Coefficient of variation (`cv`)
+
+> This query is also available as `rsd`.
+
+The coefficient of variation (`cv`), also known as relative standard deviation (`rsd`),
+is a standardized measure of dispersion of a probability distribution or frequency distribution.
+
+It is defined as the ratio of the **standard deviation** to the **mean**.  
+
+In simple terms, it gives the percentage of change. So, if the average value of a metric is 1000
+and its standard deviation is 100 (meaning that it variates from 900 to 1100), then `cv` is 10%.
+
+This is an easy way to check the % variation, without using absolute values.
+
+For example, you may trigger an alarm if your web server requests/sec `cv` is above 20 (`%`)
+over the last minute. So if your web server was serving 1000 reqs/sec over the last minute,
+it will trigger the alarm if had spikes below 800/sec or above 1200/sec.
+
+## how to use
+
+Use it in alarms like this:
+
+```
+ alarm: my_alarm
+    on: my_chart
+lookup: cv -1m unaligned of my_dimension
+ units: %
+  warn: $this > 20
+```
+
+The units reported by `cv` is always `%`.
+
+It can also be used in APIs and badges as `&group=cv` in the URL.
+
+## Examples
+
+Examining last 1 minute `successful` web server responses:
+
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&dimensions=success&group=min&after=-60&label=min)
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&dimensions=success&group=average&after=-60&label=average&value_color=yellow)
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&dimensions=success&group=cv&after=-60&label=coefficient+of+variation&value_color=orange&units=pcent)
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&dimensions=success&group=max&after=-60&label=max)
+
+## References
+
+Check [https://en.wikipedia.org/wiki/Coefficient_of_variation](https://en.wikipedia.org/wiki/Coefficient_of_variation).
diff --git a/web/api/queries/stddev/stddev.c b/web/api/queries/stddev/stddev.c
new file mode 100644
index 000000000..3858003d9
--- /dev/null
+++ b/web/api/queries/stddev/stddev.c
@@ -0,0 +1,178 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "stddev.h"
+
+
+// ----------------------------------------------------------------------------
+// stddev
+
+// this implementation comes from:
+// https://www.johndcook.com/blog/standard_deviation/
+
+struct grouping_stddev {
+    long count;
+    calculated_number m_oldM, m_newM, m_oldS, m_newS;
+};
+
+void *grouping_create_stddev(RRDR *r) {
+    long entries = r->group;
+    if(entries < 0) entries = 0;
+
+    return callocz(1, sizeof(struct grouping_stddev) + entries * sizeof(LONG_DOUBLE));
+}
+
+// resets when switches dimensions
+// so, clear everything to restart
+void grouping_reset_stddev(RRDR *r) {
+    struct grouping_stddev *g = (struct grouping_stddev *)r->internal.grouping_data;
+    g->count = 0;
+}
+
+void grouping_free_stddev(RRDR *r) {
+    freez(r->internal.grouping_data);
+    r->internal.grouping_data = NULL;
+}
+
+void grouping_add_stddev(RRDR *r, calculated_number value) {
+    struct grouping_stddev *g = (struct grouping_stddev *)r->internal.grouping_data;
+
+    if(isnormal(value)) {
+        g->count++;
+
+        // See Knuth TAOCP vol 2, 3rd edition, page 232
+        if (g->count == 1) {
+            g->m_oldM = g->m_newM = value;
+            g->m_oldS = 0.0;
+        }
+        else {
+            g->m_newM = g->m_oldM + (value - g->m_oldM) / g->count;
+            g->m_newS = g->m_oldS + (value - g->m_oldM) * (value - g->m_newM);
+
+            // set up for next iteration
+            g->m_oldM = g->m_newM;
+            g->m_oldS = g->m_newS;
+        }
+    }
+}
+
+static inline calculated_number mean(struct grouping_stddev *g) {
+    return (g->count > 0) ? g->m_newM : 0.0;
+}
+
+static inline calculated_number variance(struct grouping_stddev *g) {
+    return ( (g->count > 1) ? g->m_newS/(g->count - 1) : 0.0 );
+}
+static inline calculated_number stddev(struct grouping_stddev *g) {
+    return sqrtl(variance(g));
+}
+
+calculated_number grouping_flush_stddev(RRDR *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr) {
+    struct grouping_stddev *g = (struct grouping_stddev *)r->internal.grouping_data;
+
+    calculated_number value;
+
+    if(likely(g->count > 1)) {
+        value = stddev(g);
+
+        if(!isnormal(value)) {
+            value = 0.0;
+            *rrdr_value_options_ptr |= RRDR_VALUE_EMPTY;
+        }
+    }
+    else if(g->count == 1) {
+        value = 0.0;
+    }
+    else {
+        value = 0.0;
+        *rrdr_value_options_ptr |= RRDR_VALUE_EMPTY;
+    }
+
+    grouping_reset_stddev(r);
+
+    return  value;
+}
+
+// https://en.wikipedia.org/wiki/Coefficient_of_variation
+calculated_number grouping_flush_coefficient_of_variation(RRDR *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr) {
+    struct grouping_stddev *g = (struct grouping_stddev *)r->internal.grouping_data;
+
+    calculated_number value;
+
+    if(likely(g->count > 1)) {
+        calculated_number m = mean(g);
+        value = 100.0 * stddev(g) / ((m < 0)? -m : m);
+
+        if(unlikely(!isnormal(value))) {
+            value = 0.0;
+            *rrdr_value_options_ptr |= RRDR_VALUE_EMPTY;
+        }
+    }
+    else if(g->count == 1) {
+        // one value collected
+        value = 0.0;
+    }
+    else {
+        // no values collected
+        value = 0.0;
+        *rrdr_value_options_ptr |= RRDR_VALUE_EMPTY;
+    }
+
+    grouping_reset_stddev(r);
+
+    return  value;
+}
+
+
+/*
+ * Mean = average
+ *
+calculated_number grouping_flush_mean(RRDR *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr) {
+    struct grouping_stddev *g = (struct grouping_stddev *)r->internal.grouping_data;
+
+    calculated_number value;
+
+    if(unlikely(!g->count)) {
+        value = 0.0;
+        *rrdr_value_options_ptr |= RRDR_VALUE_EMPTY;
+    }
+    else {
+        value = mean(g);
+
+        if(!isnormal(value)) {
+            value = 0.0;
+            *rrdr_value_options_ptr |= RRDR_VALUE_EMPTY;
+        }
+    }
+
+    grouping_reset_stddev(r);
+
+    return  value;
+}
+ */
+
+/*
+ * It is not advised to use this version of variance directly
+ *
+calculated_number grouping_flush_variance(RRDR *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr) {
+    struct grouping_stddev *g = (struct grouping_stddev *)r->internal.grouping_data;
+
+    calculated_number value;
+
+    if(unlikely(!g->count)) {
+        value = 0.0;
+        *rrdr_value_options_ptr |= RRDR_VALUE_EMPTY;
+    }
+    else {
+        value = variance(g);
+
+        if(!isnormal(value)) {
+            value = 0.0;
+            *rrdr_value_options_ptr |= RRDR_VALUE_EMPTY;
+        }
+    }
+
+    grouping_reset_stddev(r);
+
+    return  value;
+}
+*/
+\ No newline at end of file
diff --git a/web/api/queries/stddev/stddev.h b/web/api/queries/stddev/stddev.h
new file mode 100644
index 000000000..7a4697572
--- /dev/null
+++ b/web/api/queries/stddev/stddev.h
@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_API_QUERIES_STDDEV_H
+#define NETDATA_API_QUERIES_STDDEV_H
+
+#include "../query.h"
+#include "../rrdr.h"
+
+extern void *grouping_create_stddev(RRDR *r);
+extern void grouping_reset_stddev(RRDR *r);
+extern void grouping_free_stddev(RRDR *r);
+extern void grouping_add_stddev(RRDR *r, calculated_number value);
+extern calculated_number grouping_flush_stddev(RRDR *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr);
+extern calculated_number grouping_flush_coefficient_of_variation(RRDR *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr);
+// extern calculated_number grouping_flush_mean(RRDR *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr);
+// extern calculated_number grouping_flush_variance(RRDR *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr);
+
+#endif //NETDATA_API_QUERIES_STDDEV_H
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new file mode 100644
index 000000000..19554bed8
--- /dev/null
+++ b/web/api/queries/sum/Makefile.am
@@ -0,0 +1,8 @@
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+
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+
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new file mode 100644
index 000000000..56dfb2d75
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+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: check-am
+all-am: Makefile $(DATA)
+installdirs:
+install: install-am
+install-exec: install-exec-am
+install-data: install-data-am
+uninstall: uninstall-am
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-am
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+	-test -z "$(MAINTAINERCLEANFILES)" || rm -f $(MAINTAINERCLEANFILES)
+clean: clean-am
+
+clean-am: clean-generic mostlyclean-am
+
+distclean: distclean-am
+	-rm -f Makefile
+distclean-am: clean-am distclean-generic
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-generic
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: install-am install-strip
+
+.PHONY: all all-am check check-am clean clean-generic cscopelist-am \
+	ctags-am distclean distclean-generic distdir dvi dvi-am html \
+	html-am info info-am install install-am install-data \
+	install-data-am install-dvi install-dvi-am install-exec \
+	install-exec-am install-html install-html-am install-info \
+	install-info-am install-man install-pdf install-pdf-am \
+	install-ps install-ps-am install-strip installcheck \
+	installcheck-am installdirs maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-generic pdf \
+	pdf-am ps ps-am tags-am uninstall uninstall-am
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/web/api/queries/sum/README.md b/web/api/queries/sum/README.md
new file mode 100644
index 000000000..be6596080
--- /dev/null
+++ b/web/api/queries/sum/README.md
@@ -0,0 +1,34 @@
+# Sum
+
+This module sums all the values in the time-frame requested.
+
+You can use `sum` to find the volume of something over a period.
+
+## how to use
+
+Use it in alarms like this:
+
+```
+ alarm: my_alarm
+    on: my_chart
+lookup: sum -1m unaligned of my_dimension
+  warn: $this > 1000
+```
+
+`sum` does not change the units. For example, if the chart units is `requests/sec`, the result
+will be again expressed in the same units. 
+
+It can also be used in APIs and badges as `&group=sum` in the URL.
+
+## Examples
+
+Examining last 1 minute `successful` web server responses:
+
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=min&after=-60&label=min)
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=average&after=-60&label=average)
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=max&after=-60&label=max)
+- ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=sum&after=-60&label=1m+sum&value_color=orange&units=requests)
+
+## References
+
+- [https://en.wikipedia.org/wiki/Summation](https://en.wikipedia.org/wiki/Summation).
diff --git a/web/api/queries/sum/sum.c b/web/api/queries/sum/sum.c
new file mode 100644
index 000000000..0da9937a3
--- /dev/null
+++ b/web/api/queries/sum/sum.c
@@ -0,0 +1,58 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "sum.h"
+
+// ----------------------------------------------------------------------------
+// sum
+
+struct grouping_sum {
+    calculated_number sum;
+    size_t count;
+};
+
+void *grouping_create_sum(RRDR *r) {
+    (void)r;
+    return callocz(1, sizeof(struct grouping_sum));
+}
+
+// resets when switches dimensions
+// so, clear everything to restart
+void grouping_reset_sum(RRDR *r) {
+    struct grouping_sum *g = (struct grouping_sum *)r->internal.grouping_data;
+    g->sum = 0;
+    g->count = 0;
+}
+
+void grouping_free_sum(RRDR *r) {
+    freez(r->internal.grouping_data);
+    r->internal.grouping_data = NULL;
+}
+
+void grouping_add_sum(RRDR *r, calculated_number value) {
+    if(!isnan(value)) {
+        struct grouping_sum *g = (struct grouping_sum *)r->internal.grouping_data;
+        g->sum += value;
+        g->count++;
+    }
+}
+
+calculated_number grouping_flush_sum(RRDR *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr) {
+    struct grouping_sum *g = (struct grouping_sum *)r->internal.grouping_data;
+
+    calculated_number value;
+
+    if(unlikely(!g->count)) {
+        value = 0.0;
+        *rrdr_value_options_ptr |= RRDR_VALUE_EMPTY;
+    }
+    else {
+        value = g->sum;
+    }
+
+    g->sum = 0.0;
+    g->count = 0;
+
+    return value;
+}
+
+
diff --git a/web/api/queries/sum/sum.h b/web/api/queries/sum/sum.h
new file mode 100644
index 000000000..9dc8d209c
--- /dev/null
+++ b/web/api/queries/sum/sum.h
@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_API_QUERY_SUM_H
+#define NETDATA_API_QUERY_SUM_H
+
+#include "../query.h"
+#include "../rrdr.h"
+
+extern void *grouping_create_sum(RRDR *r);
+extern void grouping_reset_sum(RRDR *r);
+extern void grouping_free_sum(RRDR *r);
+extern void grouping_add_sum(RRDR *r, calculated_number value);
+extern calculated_number grouping_flush_sum(RRDR *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr);
+
+#endif //NETDATA_API_QUERY_SUM_H
diff --git a/src/web_api_v1.c b/web/api/web_api_v1.c
index c32660c81..1e03828e4 100644
--- a/src/web_api_v1.c
+++ b/web/api/web_api_v1.c
@@ -1,23 +1,11 @@
-#include "common.h"
+// SPDX-License-Identifier: GPL-3.0-or-later
 
-static struct {
-    const char *name;
-    uint32_t hash;
-    int value;
-} api_v1_data_groups[] = {
-        {  "average"        , 0    , GROUP_AVERAGE}
-        , {"min"            , 0    , GROUP_MIN}
-        , {"max"            , 0    , GROUP_MAX}
-        , {"sum"            , 0    , GROUP_SUM}
-        , {"incremental_sum", 0    , GROUP_INCREMENTAL_SUM}
-        , {"incremental-sum", 0    , GROUP_INCREMENTAL_SUM}
-        , {                 NULL, 0, 0}
-};
+#include "web_api_v1.h"
 
 static struct {
     const char *name;
     uint32_t hash;
-    uint32_t value;
+    RRDR_OPTIONS value;
 } api_v1_data_options[] = {
         {  "nonzero"         , 0    , RRDR_OPTION_NONZERO}
         , {"flip"            , 0    , RRDR_OPTION_REVERSED}
@@ -64,6 +52,7 @@ static struct {
         , {DATASOURCE_FORMAT_JS_ARRAY       , 0 , DATASOURCE_JS_ARRAY}
         , {DATASOURCE_FORMAT_SSV_COMMA      , 0 , DATASOURCE_SSV_COMMA}
         , {DATASOURCE_FORMAT_CSV_JSON_ARRAY , 0 , DATASOURCE_CSV_JSON_ARRAY}
+        , {DATASOURCE_FORMAT_CSV_MARKDOWN   , 0 , DATASOURCE_CSV_MARKDOWN}
         , {                                 NULL, 0, 0}
 };
 
@@ -84,9 +73,6 @@ static struct {
 void web_client_api_v1_init(void) {
     int i;
 
-    for(i = 0; api_v1_data_groups[i].name ; i++)
-        api_v1_data_groups[i].hash = simple_hash(api_v1_data_groups[i].name);
-
     for(i = 0; api_v1_data_options[i].name ; i++)
         api_v1_data_options[i].hash = simple_hash(api_v1_data_options[i].name);
 
@@ -95,17 +81,8 @@ void web_client_api_v1_init(void) {
 
     for(i = 0; api_v1_data_google_formats[i].name ; i++)
         api_v1_data_google_formats[i].hash = simple_hash(api_v1_data_google_formats[i].name);
-}
-
-inline int web_client_api_request_v1_data_group(char *name, int def) {
-    int i;
 
-    uint32_t hash = simple_hash(name);
-    for(i = 0; api_v1_data_groups[i].name ; i++)
-        if(unlikely(hash == api_v1_data_groups[i].hash && !strcmp(name, api_v1_data_groups[i].name)))
-            return api_v1_data_groups[i].value;
-
-    return def;
+    web_client_api_v1_init_grouping();
 }
 
 inline uint32_t web_client_api_request_v1_data_options(char *o) {
@@ -248,358 +225,21 @@ inline int web_client_api_request_v1_charts(RRDHOST *host, struct web_client *w,
 
     buffer_flush(w->response.data);
     w->response.data->contenttype = CT_APPLICATION_JSON;
-    rrd_stats_api_v1_charts(host, w->response.data);
+    charts2json(host, w->response.data);
     return 200;
 }
 
-inline int web_client_api_request_v1_allmetrics(RRDHOST *host, struct web_client *w, char *url) {
-    int format = ALLMETRICS_SHELL;
-    int help = 0, types = 0, timestamps = 1, names = backend_send_names; // prometheus options
-    const char *prometheus_server = w->client_ip;
-    uint32_t prometheus_options = backend_options;
-    const char *prometheus_prefix = backend_prefix;
-
-    while(url) {
-        char *value = mystrsep(&url, "?&");
-        if (!value || !*value) continue;
-
-        char *name = mystrsep(&value, "=");
-        if(!name || !*name) continue;
-        if(!value || !*value) continue;
-
-        if(!strcmp(name, "format")) {
-            if(!strcmp(value, ALLMETRICS_FORMAT_SHELL))
-                format = ALLMETRICS_SHELL;
-            else if(!strcmp(value, ALLMETRICS_FORMAT_PROMETHEUS))
-                format = ALLMETRICS_PROMETHEUS;
-            else if(!strcmp(value, ALLMETRICS_FORMAT_PROMETHEUS_ALL_HOSTS))
-                format = ALLMETRICS_PROMETHEUS_ALL_HOSTS;
-            else if(!strcmp(value, ALLMETRICS_FORMAT_JSON))
-                format = ALLMETRICS_JSON;
-            else
-                format = 0;
-        }
-        else if(!strcmp(name, "help")) {
-            if(!strcmp(value, "yes"))
-                help = 1;
-            else
-                help = 0;
-        }
-        else if(!strcmp(name, "types")) {
-            if(!strcmp(value, "yes"))
-                types = 1;
-            else
-                types = 0;
-        }
-        else if(!strcmp(name, "names")) {
-            if(!strcmp(value, "yes"))
-                names = 1;
-            else
-                names = 0;
-        }
-        else if(!strcmp(name, "timestamps")) {
-            if(!strcmp(value, "yes"))
-                timestamps = 1;
-            else
-                timestamps = 0;
-        }
-        else if(!strcmp(name, "server")) {
-            prometheus_server = value;
-        }
-        else if(!strcmp(name, "prefix")) {
-            prometheus_prefix = value;
-        }
-        else if(!strcmp(name, "data") || !strcmp(name, "source") || !strcmp(name, "data source") || !strcmp(name, "data-source") || !strcmp(name, "data_source") || !strcmp(name, "datasource")) {
-            prometheus_options = backend_parse_data_source(value, prometheus_options);
-        }
-    }
-
-    buffer_flush(w->response.data);
-    buffer_no_cacheable(w->response.data);
-
-    switch(format) {
-        case ALLMETRICS_JSON:
-            w->response.data->contenttype = CT_APPLICATION_JSON;
-            rrd_stats_api_v1_charts_allmetrics_json(host, w->response.data);
-            return 200;
-
-        case ALLMETRICS_SHELL:
-            w->response.data->contenttype = CT_TEXT_PLAIN;
-            rrd_stats_api_v1_charts_allmetrics_shell(host, w->response.data);
-            return 200;
-
-        case ALLMETRICS_PROMETHEUS:
-            w->response.data->contenttype = CT_PROMETHEUS;
-            rrd_stats_api_v1_charts_allmetrics_prometheus_single_host(host, w->response.data, prometheus_server, prometheus_prefix, prometheus_options, help, types, names, timestamps);
-            return 200;
-
-        case ALLMETRICS_PROMETHEUS_ALL_HOSTS:
-            w->response.data->contenttype = CT_PROMETHEUS;
-            rrd_stats_api_v1_charts_allmetrics_prometheus_all_hosts(host, w->response.data, prometheus_server, prometheus_prefix, prometheus_options, help, types, names, timestamps);
-            return 200;
-
-        default:
-            w->response.data->contenttype = CT_TEXT_PLAIN;
-            buffer_strcat(w->response.data, "Which format? '" ALLMETRICS_FORMAT_SHELL "', '" ALLMETRICS_FORMAT_PROMETHEUS "', '" ALLMETRICS_FORMAT_PROMETHEUS_ALL_HOSTS "' and '" ALLMETRICS_FORMAT_JSON "' are currently supported.");
-            return 400;
-    }
-}
-
 inline int web_client_api_request_v1_chart(RRDHOST *host, struct web_client *w, char *url) {
     return web_client_api_request_single_chart(host, w, url, rrd_stats_api_v1_chart);
 }
 
-int web_client_api_request_v1_badge(RRDHOST *host, struct web_client *w, char *url) {
-    int ret = 400;
-    buffer_flush(w->response.data);
-
-    BUFFER *dimensions = NULL;
-
-    const char *chart = NULL
-    , *before_str = NULL
-    , *after_str = NULL
-    , *points_str = NULL
-    , *multiply_str = NULL
-    , *divide_str = NULL
-    , *label = NULL
-    , *units = NULL
-    , *label_color = NULL
-    , *value_color = NULL
-    , *refresh_str = NULL
-    , *precision_str = NULL
-    , *scale_str = NULL
-    , *alarm = NULL;
-
-    int group = GROUP_AVERAGE;
-    uint32_t options = 0x00000000;
-
-    while(url) {
-        char *value = mystrsep(&url, "/?&");
-        if(!value || !*value) continue;
-
-        char *name = mystrsep(&value, "=");
-        if(!name || !*name) continue;
-        if(!value || !*value) continue;
-
-        debug(D_WEB_CLIENT, "%llu: API v1 badge.svg query param '%s' with value '%s'", w->id, name, value);
-
-        // name and value are now the parameters
-        // they are not null and not empty
-
-        if(!strcmp(name, "chart")) chart = value;
-        else if(!strcmp(name, "dimension") || !strcmp(name, "dim") || !strcmp(name, "dimensions") || !strcmp(name, "dims")) {
-            if(!dimensions)
-                dimensions = buffer_create(100);
-
-            buffer_strcat(dimensions, "|");
-            buffer_strcat(dimensions, value);
-        }
-        else if(!strcmp(name, "after")) after_str = value;
-        else if(!strcmp(name, "before")) before_str = value;
-        else if(!strcmp(name, "points")) points_str = value;
-        else if(!strcmp(name, "group")) {
-            group = web_client_api_request_v1_data_group(value, GROUP_AVERAGE);
-        }
-        else if(!strcmp(name, "options")) {
-            options |= web_client_api_request_v1_data_options(value);
-        }
-        else if(!strcmp(name, "label")) label = value;
-        else if(!strcmp(name, "units")) units = value;
-        else if(!strcmp(name, "label_color")) label_color = value;
-        else if(!strcmp(name, "value_color")) value_color = value;
-        else if(!strcmp(name, "multiply")) multiply_str = value;
-        else if(!strcmp(name, "divide")) divide_str = value;
-        else if(!strcmp(name, "refresh")) refresh_str = value;
-        else if(!strcmp(name, "precision")) precision_str = value;
-        else if(!strcmp(name, "scale")) scale_str = value;
-        else if(!strcmp(name, "alarm")) alarm = value;
-    }
-
-    if(!chart || !*chart) {
-        buffer_no_cacheable(w->response.data);
-        buffer_sprintf(w->response.data, "No chart id is given at the request.");
-        goto cleanup;
-    }
-
-    int scale = (scale_str && *scale_str)?str2i(scale_str):100;
-
-    RRDSET *st = rrdset_find(host, chart);
-    if(!st) st = rrdset_find_byname(host, chart);
-    if(!st) {
-        buffer_no_cacheable(w->response.data);
-        buffer_svg(w->response.data, "chart not found", NAN, "", NULL, NULL, -1, scale, 0);
-        ret = 200;
-        goto cleanup;
-    }
-    st->last_accessed_time = now_realtime_sec();
-
-    RRDCALC *rc = NULL;
-    if(alarm) {
-        rc = rrdcalc_find(st, alarm);
-        if (!rc) {
-            buffer_no_cacheable(w->response.data);
-            buffer_svg(w->response.data, "alarm not found", NAN, "", NULL, NULL, -1, scale, 0);
-            ret = 200;
-            goto cleanup;
-        }
-    }
-
-    long long multiply  = (multiply_str  && *multiply_str )?str2l(multiply_str):1;
-    long long divide    = (divide_str    && *divide_str   )?str2l(divide_str):1;
-    long long before    = (before_str    && *before_str   )?str2l(before_str):0;
-    long long after     = (after_str     && *after_str    )?str2l(after_str):-st->update_every;
-    int       points    = (points_str    && *points_str   )?str2i(points_str):1;
-    int       precision = (precision_str && *precision_str)?str2i(precision_str):-1;
-
-    if(!multiply) multiply = 1;
-    if(!divide) divide = 1;
-
-    int refresh = 0;
-    if(refresh_str && *refresh_str) {
-        if(!strcmp(refresh_str, "auto")) {
-            if(rc) refresh = rc->update_every;
-            else if(options & RRDR_OPTION_NOT_ALIGNED)
-                refresh = st->update_every;
-            else {
-                refresh = (int)(before - after);
-                if(refresh < 0) refresh = -refresh;
-            }
-        }
-        else {
-            refresh = str2i(refresh_str);
-            if(refresh < 0) refresh = -refresh;
-        }
-    }
-
-    if(!label) {
-        if(alarm) {
-            char *s = (char *)alarm;
-            while(*s) {
-                if(*s == '_') *s = ' ';
-                s++;
-            }
-            label = alarm;
-        }
-        else if(dimensions) {
-            const char *dim = buffer_tostring(dimensions);
-            if(*dim == '|') dim++;
-            label = dim;
-        }
-        else
-            label = st->name;
-    }
-    if(!units) {
-        if(alarm) {
-            if(rc->units)
-                units = rc->units;
-            else
-                units = "";
-        }
-        else if(options & RRDR_OPTION_PERCENTAGE)
-            units = "%";
-        else
-            units = st->units;
-    }
-
-    debug(D_WEB_CLIENT, "%llu: API command 'badge.svg' for chart '%s', alarm '%s', dimensions '%s', after '%lld', before '%lld', points '%d', group '%d', options '0x%08x'"
-          , w->id
-          , chart
-          , alarm?alarm:""
-          , (dimensions)?buffer_tostring(dimensions):""
-          , after
-          , before
-          , points
-          , group
-          , options
-    );
-
-    if(rc) {
-        if (refresh > 0) {
-            buffer_sprintf(w->response.header, "Refresh: %d\r\n", refresh);
-            w->response.data->expires = now_realtime_sec() + refresh;
-        }
-        else buffer_no_cacheable(w->response.data);
-
-        if(!value_color) {
-            switch(rc->status) {
-                case RRDCALC_STATUS_CRITICAL:
-                    value_color = "red";
-                    break;
-
-                case RRDCALC_STATUS_WARNING:
-                    value_color = "orange";
-                    break;
+void fix_google_param(char *s) {
+    if(unlikely(!s)) return;
 
-                case RRDCALC_STATUS_CLEAR:
-                    value_color = "brightgreen";
-                    break;
-
-                case RRDCALC_STATUS_UNDEFINED:
-                    value_color = "lightgrey";
-                    break;
-
-                case RRDCALC_STATUS_UNINITIALIZED:
-                    value_color = "#000";
-                    break;
-
-                default:
-                    value_color = "grey";
-                    break;
-            }
-        }
-
-        buffer_svg(w->response.data,
-                label,
-                (isnan(rc->value)||isinf(rc->value)) ? rc->value : rc->value * multiply / divide,
-                units,
-                label_color,
-                value_color,
-                precision,
-                scale,
-                options
-        );
-        ret = 200;
+    for( ; *s ;s++) {
+        if(!isalnum(*s) && *s != '.' && *s != '_' && *s != '-')
+            *s = '_';
     }
-    else {
-        time_t latest_timestamp = 0;
-        int value_is_null = 1;
-        calculated_number n = NAN;
-        ret = 500;
-
-        // if the collected value is too old, don't calculate its value
-        if (rrdset_last_entry_t(st) >= (now_realtime_sec() - (st->update_every * st->gap_when_lost_iterations_above)))
-            ret = rrdset2value_api_v1(st, w->response.data, &n, (dimensions) ? buffer_tostring(dimensions) : NULL
-                                      , points, after, before, group, 0, options, NULL, &latest_timestamp, &value_is_null);
-
-        // if the value cannot be calculated, show empty badge
-        if (ret != 200) {
-            buffer_no_cacheable(w->response.data);
-            value_is_null = 1;
-            n = 0;
-            ret = 200;
-        }
-        else if (refresh > 0) {
-            buffer_sprintf(w->response.header, "Refresh: %d\r\n", refresh);
-            w->response.data->expires = now_realtime_sec() + refresh;
-        }
-        else buffer_no_cacheable(w->response.data);
-
-        // render the badge
-        buffer_svg(w->response.data,
-                label,
-                (value_is_null)?NAN:(n * multiply / divide),
-                units,
-                label_color,
-                value_color,
-                precision,
-                scale,
-                options
-        );
-    }
-
-    cleanup:
-    buffer_free(dimensions);
-    return ret;
 }
 
 // returns the HTTP code
@@ -626,7 +266,7 @@ inline int web_client_api_request_v1_data(RRDHOST *host, struct web_client *w, c
     , *group_time_str = NULL
     , *points_str = NULL;
 
-    int group = GROUP_AVERAGE;
+    int group = RRDR_GROUPING_AVERAGE;
     uint32_t format = DATASOURCE_JSON;
     uint32_t options = 0x00000000;
 
@@ -654,7 +294,7 @@ inline int web_client_api_request_v1_data(RRDHOST *host, struct web_client *w, c
         else if(!strcmp(name, "points")) points_str = value;
         else if(!strcmp(name, "gtime")) group_time_str = value;
         else if(!strcmp(name, "group")) {
-            group = web_client_api_request_v1_data_group(value, GROUP_AVERAGE);
+            group = web_client_api_request_v1_data_group(value, RRDR_GROUPING_AVERAGE);
         }
         else if(!strcmp(name, "format")) {
             format = web_client_api_request_v1_data_format(value);
@@ -701,6 +341,14 @@ inline int web_client_api_request_v1_data(RRDHOST *host, struct web_client *w, c
         }
     }
 
+    // validate the google parameters given
+    fix_google_param(google_out);
+    fix_google_param(google_sig);
+    fix_google_param(google_reqId);
+    fix_google_param(google_version);
+    fix_google_param(responseHandler);
+    fix_google_param(outFileName);
+
     if(!chart || !*chart) {
         buffer_sprintf(w->response.data, "No chart id is given at the request.");
         goto cleanup;
@@ -808,7 +456,7 @@ inline int web_client_api_request_v1_registry(RRDHOST *host, struct web_client *
 
     debug(D_WEB_CLIENT, "%llu: API v1 registry with URL '%s'", w->id, url);
 
-    // FIXME
+    // TODO
     // The browser may send multiple cookies with our id
 
     char *cookie = strstr(w->response.data->buffer, NETDATA_REGISTRY_COOKIE_NAME "=");
diff --git a/src/web_api_v1.h b/web/api/web_api_v1.h
index 6f4de1aba..b6f315dca 100644
--- a/src/web_api_v1.h
+++ b/web/api/web_api_v1.h
@@ -1,7 +1,12 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 #ifndef NETDATA_WEB_API_V1_H
-#define NETDATA_WEB_API_V1_H
+#define NETDATA_WEB_API_V1_H 1
+
+#include "daemon/common.h"
+#include "web/api/badges/web_buffer_svg.h"
+#include "web/api/formatters/rrd2json.h"
 
-extern int web_client_api_request_v1_data_group(char *name, int def);
 extern uint32_t web_client_api_request_v1_data_options(char *o);
 extern uint32_t web_client_api_request_v1_data_format(char *name);
 extern uint32_t web_client_api_request_v1_data_google_format(char *name);
@@ -11,9 +16,7 @@ extern int web_client_api_request_v1_alarm_log(RRDHOST *host, struct web_client
 extern int web_client_api_request_single_chart(RRDHOST *host, struct web_client *w, char *url, void callback(RRDSET *st, BUFFER *buf));
 extern int web_client_api_request_v1_alarm_variables(RRDHOST *host, struct web_client *w, char *url);
 extern int web_client_api_request_v1_charts(RRDHOST *host, struct web_client *w, char *url);
-extern int web_client_api_request_v1_allmetrics(RRDHOST *host, struct web_client *w, char *url);
 extern int web_client_api_request_v1_chart(RRDHOST *host, struct web_client *w, char *url);
-extern int web_client_api_request_v1_badge(RRDHOST *host, struct web_client *w, char *url);
 extern int web_client_api_request_v1_data(RRDHOST *host, struct web_client *w, char *url);
 extern int web_client_api_request_v1_registry(RRDHOST *host, struct web_client *w, char *url);
 extern int web_client_api_request_v1(RRDHOST *host, struct web_client *w, char *url);
author	Daniel Baumann <daniel.baumann@progress-linux.org>	2018-11-07 12:22:44 +0000
committer	Daniel Baumann <daniel.baumann@progress-linux.org>	2018-11-07 12:22:44 +0000
commit	1e6c93250172946eeb38e94a92a1fd12c9d3011e (patch)
tree	8ca5e16dfc7ad6b3bf2738ca0a48408a950f8f7e /web/api
parent	Update watch file (diff)
download	netdata-1e6c93250172946eeb38e94a92a1fd12c9d3011e.tar.xz netdata-1e6c93250172946eeb38e94a92a1fd12c9d3011e.zip