New upstream version 1.4.0+dfsgupstream/1.4.0+dfsg

8 files changed, 964 insertions, 364 deletions

diff --git a/plugins.d/Makefile.am b/plugins.d/Makefile.am
index b8a28610a..4bc0dc447 100644
--- a/plugins.d/Makefile.am
+++ b/plugins.d/Makefile.am
@@ -9,6 +9,7 @@ dist_plugins_DATA = \
 
 dist_plugins_SCRIPTS = \
 	alarm-email.sh \
+	alarm-notify.sh \
 	cgroup-name.sh \
 	charts.d.dryrun-helper.sh \
 	charts.d.plugin \
diff --git a/plugins.d/Makefile.in b/plugins.d/Makefile.in
index 06211d51c..1854ea861 100644
--- a/plugins.d/Makefile.in
+++ b/plugins.d/Makefile.in
@@ -83,8 +83,13 @@ subdir = plugins.d
 DIST_COMMON = $(srcdir)/Makefile.in $(srcdir)/Makefile.am \
 	$(dist_plugins_SCRIPTS) $(dist_plugins_DATA)
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
-am__aclocal_m4_deps = $(top_srcdir)/m4/ax_pthread.m4 \
-	$(top_srcdir)/configure.ac
+am__aclocal_m4_deps = $(top_srcdir)/m4/ax_c___atomic.m4 \
+	$(top_srcdir)/m4/ax_c__generic.m4 \
+	$(top_srcdir)/m4/ax_c_mallinfo.m4 \
+	$(top_srcdir)/m4/ax_c_mallopt.m4 \
+	$(top_srcdir)/m4/ax_check_compile_flag.m4 \
+	$(top_srcdir)/m4/ax_pthread.m4 $(top_srcdir)/m4/jemalloc.m4 \
+	$(top_srcdir)/m4/tcmalloc.m4 $(top_srcdir)/configure.ac
 am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \
 	$(ACLOCAL_M4)
 mkinstalldirs = $(install_sh) -d
@@ -208,6 +213,7 @@ 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@
@@ -240,6 +246,8 @@ 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@
@@ -286,6 +294,7 @@ dist_plugins_DATA = \
 
 dist_plugins_SCRIPTS = \
 	alarm-email.sh \
+	alarm-notify.sh \
 	cgroup-name.sh \
 	charts.d.dryrun-helper.sh \
 	charts.d.plugin \
diff --git a/plugins.d/alarm-email.sh b/plugins.d/alarm-email.sh
index 78c79ccdb..df083c655 100755
--- a/plugins.d/alarm-email.sh
+++ b/plugins.d/alarm-email.sh
@@ -1,264 +1,6 @@
 #!/usr/bin/env bash
 
-me="${0}"
+# OBSOLETE - REPLACED WITH
+# alarm-notify.sh
 
-sendmail="$(which sendmail 2>/dev/null || command -v sendmail 2>/dev/null)"
-if [ -z "${sendmail}" ]
-then
-    echo >&2 "I cannot send emails - there is no sendmail command available."
-fi
-
-sendmail_from_pipe() {
-    "${sendmail}" -t
-
-    if [ $? -eq 0 ]
-    then
-        echo >&2 "${me}: Sent notification email for ${status} on '${chart}.${name}'"
-        return 0
-    else
-        echo >&2 "${me}: FAILED to send notification email for ${status} on '${chart}.${name}'"
-        return 1
-    fi
-}
-
-name="${1}"       # the name of the alarm, as given in netdata health.d entries
-chart="${2}"      # the name of the chart (type.id)
-family="${3}"     # the family of the chart
-status="${4}"     # the current status : UNITIALIZED, UNDEFINED, CLEAR, WARNING, CRITICAL
-old_status="${5}" # the previous status: UNITIALIZED, UNDEFINED, CLEAR, WARNING, CRITICAL
-value="${6}"      # the current value
-old_value="${7}"  # the previous value
-src="${8}"        # the line number and file the alarm has been configured
-duration="${9}"   # the duration in seconds the previous state took
-non_clear_duration="${10}" # the total duration in seconds this is non-clear
-units="${11}"     # the units of the value
-info="${12}"      # a short description of the alarm
-
-[ ! -z "${info}" ] && info=" <small><br/>${info}</small>"
-
-# get the system hostname
-hostname="${NETDATA_HOSTNAME}"
-[ -z "${hostname}" ] && hostname="${NETDATA_REGISTRY_HOSTNAME}"
-[ -z "${hostname}" ] && hostname="$(hostname)"
-
-goto_url="${NETDATA_REGISTRY_URL}/goto-host-from-alarm.html?machine_guid=${NETDATA_REGISTRY_UNIQUE_ID}&chart=${chart}&family=${family}"
-
-# get the current date
-date="$(date)"
-
-duration4human() {
-    local s="${1}" d=0 h=0 m=0 ds="day" hs="hour" ms="minute" ss="second"
-    d=$(( s / 86400 ))
-    s=$(( s - (d * 86400) ))
-    h=$(( s / 3600 ))
-    s=$(( s - (h * 3600) ))
-    m=$(( s / 60 ))
-    s=$(( s - (m * 60) ))
-
-    if [ ${d} -gt 0 ]
-    then
-        [ ${m} -ge 30 ] && h=$(( h + 1 ))
-        [ ${d} -gt 1 ] && ds="days"
-        [ ${h} -gt 1 ] && hs="hours"
-        if [ ${h} -gt 0 ]
-        then
-            echo "${d} ${ds} and ${h} ${hs}"
-        else
-            echo "${d} ${ds}"
-        fi
-    elif [ ${h} -gt 0 ]
-    then
-        [ ${s} -ge 30 ] && m=$(( m + 1 ))
-        [ ${h} -gt 1 ] && hs="hours"
-        [ ${m} -gt 1 ] && ms="minutes"
-        if [ ${m} -gt 0 ]
-        then
-            echo "${h} ${hs} and ${m} ${ms}"
-        else
-            echo "${h} ${hs}"
-        fi
-    elif [ ${m} -gt 0 ]
-    then
-        [ ${m} -gt 1 ] && ms="minutes"
-        [ ${s} -gt 1 ] && ss="seconds"
-        if [ ${s} -gt 0 ]
-        then
-            echo "${m} ${ms} and ${s} ${ss}"
-        else
-            echo "${m} ${ms}"
-        fi
-    else
-        [ ${s} -gt 1 ] && ss="seconds"
-        echo "${s} ${ss}"
-    fi
-}
-
-severity="${status}"
-raised_for="<br/>(was ${old_status,,} for $(duration4human ${duration}))"
-status_message="status unknown"
-color="grey"
-alarm="${name} = ${value} ${units}"
-
-# prepare the title based on status
-case "${status}" in
-	CRITICAL)
-        status_message="is critical"
-        color="#ca414b"
-        ;;
-
-    WARNING)
-        status_message="needs attention"
-        color="#caca4b"
-		;;
-
-	CLEAR)
-    	status_message="recovered"
-		color="#77ca6d"
-
-		# don't show the value when the status is CLEAR
-		# for certain alarms, this value might not have any meaning
-		alarm="${name}"
-		;;
-esac
-
-if [ "${status}" != "WARNING" -a "${status}" != "CRITICAL" -a "${status}" != "CLEAR" ]
-then
-    # don't do anything if this is not WARNING, CRITICAL or CLEAR
-    echo >&2 "${me}: not sending notification email for ${status} on '${chart}.${name}'"
-    exit 0
-elif [ "${old_status}" != "WARNING" -a "${old_status}" != "CRITICAL" -a "${status}" = "CLEAR" ]
-then
-    # don't do anything if this is CLEAR, but it was not WARNING or CRITICAL
-    echo >&2 "${me}: not sending notification email for ${status} on '${chart}.${name}' (last status was ${old_status})"
-    exit 0
-elif [ "${status}" = "CLEAR" ]
-then
-    severity="Recovered from ${old_status}"
-    if [ $non_clear_duration -gt $duration ]
-    then
-        raised_for="<br/>(had issues for $(duration4human ${non_clear_duration}))"
-    fi
-
-elif [ "${old_status}" = "WARNING" -a "${status}" = "CRITICAL" ]
-then
-    severity="Escalated to ${status}"
-    if [ $non_clear_duration -gt $duration ]
-    then
-        raised_for="<br/>(has issues for $(duration4human ${non_clear_duration}))"
-    fi
-
-elif [ "${old_status}" = "CRITICAL" -a "${status}" = "WARNING" ]
-then
-    severity="Demoted to ${status}"
-    if [ $non_clear_duration -gt $duration ]
-    then
-        raised_for="<br/>(has issues for $(duration4human ${non_clear_duration}))"
-    fi
-
-else
-    raised_for=
-fi
-
-# send the email
-cat <<EOF | sendmail_from_pipe
-To: root
-Subject: ${hostname} ${status_message} - ${chart}.${name}
-Content-Type: text/html
-
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html xmlns="http://www.w3.org/1999/xhtml" style="font-family: 'Helvetica Neue', 'Helvetica', Helvetica, Arial, sans-serif; box-sizing: border-box; font-size: 14px; margin: 0; padding: 0;">
-<body style="font-family:'Helvetica Neue','Helvetica',Helvetica,Arial,sans-serif;font-size:14px;width:100%!important;min-height:100%;line-height:1.6;background:#f6f6f6;margin:0;padding:0">
-<table>
-    <tbody>
-    <tr>
-        <td style="vertical-align:top;" valign="top"></td>
-        <td width="700" style="vertical-align:top;display:block!important;max-width:700px!important;clear:both!important;margin:0 auto;padding:0" valign="top">
-            <div style="max-width:700px;display:block;margin:0 auto;padding:20px">
-                <table width="100%" cellpadding="0" cellspacing="0"
-                       style="background:#fff;border:1px solid #e9e9e9">
-                    <tbody>
-                    <tr>
-                        <td bgcolor="#eee"
-                            style="padding: 5px 20px 5px 20px;background-color:#eee;">
-                            <div style="font-size:20px;color:#777;font-weight: bold;">netdata notification</div>
-                        </td>
-                    </tr>
-                    <tr>
-                        <td bgcolor="${color}"
-                            style="font-size:16px;vertical-align:top;font-weight:400;text-align:center;margin:0;padding:10px;color:#ffffff;background:${color}!important;border:1px solid ${color};border-top-color:${color}" align="center" valign="top">
-                            <h1 style="font-weight:400;margin:0">${hostname} ${status_message}</h1>
-                        </td>
-                    </tr>
-                    <tr>
-                        <td style="vertical-align:top" valign="top">
-                            <div style="margin:0;padding:20px;max-width:700px">
-                                <table width="100%" cellpadding="0" cellspacing="0" style="max-width:700px">
-                                    <tbody>
-                                    <tr>
-                                        <td style="font-size:18px;vertical-align:top;margin:0;padding:0 0 20px"
-                                            align="left" valign="top">
-                                            <span>${chart}</span>
-                                            <span style="display:block;color:#666666;font-size:12px;font-weight:300;line-height:1;text-transform:uppercase">Chart</span>
-                                        </td>
-                                    </tr>
-                                    <tr style="margin:0;padding:0">
-                                        <td style="font-size:18px;vertical-align:top;margin:0;padding:0 0 20px"
-                                            align="left" valign="top">
-                                            <span><b>${alarm}</b>${info}</span>
-                                            <span style="display:block;color:#666666;font-size:12px;font-weight:300;line-height:1;text-transform:uppercase">Alarm</span>
-                                        </td>
-                                    </tr>
-                                    <tr>
-                                        <td style="font-size:18px;vertical-align:top;margin:0;padding:0 0 20px"
-                                            align="left" valign="top">
-                                            <span>${family}</span>
-                                            <span style="display:block;color:#666666;font-size:12px;font-weight:300;line-height:1;text-transform:uppercase">Family</span>
-                                        </td>
-                                    </tr>
-                                    <tr style="margin:0;padding:0">
-                                        <td style="font-size:18px;vertical-align:top;margin:0;padding:0 0 20px"
-                                            align="left" valign="top">
-                                            <span>${severity}</span>
-                                            <span style="display:block;color:#666666;font-size:12px;font-weight:300;line-height:1;text-transform:uppercase">Severity</span>
-                                        </td>
-                                    </tr>
-                                    <tr style="margin:0;padding:0">
-                                        <td style="font-size:18px;vertical-align:top;margin:0;padding:0 0 20px"
-                                            align="left" valign="top"><span>${date}</span>
-                                            <span>${raised_for}</span> <span
-                                                    style="display:block;color:#666666;font-size:12px;font-weight:300;line-height:1;text-transform:uppercase">Time</span>
-                                        </td>
-                                    </tr>
-                                    <!--
-                                    <tr style="margin:0;padding:0">
-                                        <td style="font-size:18px;vertical-align:top;margin:0;padding:0 0 20px">
-                                            <a href="${goto_url}" style="font-size:14px;color:#ffffff;text-decoration:none;line-height:1.5;font-weight:bold;text-align:center;display:inline-block;text-transform:capitalize;background:#35568d;border-width:1px;border-style:solid;border-color:#2b4c86;margin:0;padding:10px 15px" target="_blank">View Netdata</a>
-                                        </td>
-                                    </tr>
-                                    -->
-                                    <tr style="text-align:center;margin:0;padding:0">
-                                        <td style="font-size:11px;vertical-align:top;margin:0;padding:10px 0 0 0;color:#666666"
-                                            align="center" valign="bottom">The source of this alarm is line <code>${src}</code>
-                                        </td>
-                                    </tr>
-                                    <tr style="text-align:center;margin:0;padding:0">
-                                        <td style="font-size:12px;vertical-align:top;margin:0;padding:20px 0 0 0;color:#666666;border-top:1px solid #f0f0f0"
-                                            align="center" valign="bottom">Sent by
-                                            <a href="https://mynetdata.io/" target="_blank">netdata</a>, the real-time performance monitoring.
-                                        </td>
-                                    </tr>
-                                    </tbody>
-                                </table>
-                            </div>
-                        </td>
-                    </tr>
-                    </tbody>
-                </table>
-            </div>
-        </td>
-    </tr>
-    </tbody>
-</table>
-</body>
-</html>
-EOF
+${0/alarm-email.sh/alarm-notify.sh} "${@}"
diff --git a/plugins.d/alarm-notify.sh b/plugins.d/alarm-notify.sh
new file mode 100755
index 000000000..feec6ceae
--- /dev/null
+++ b/plugins.d/alarm-notify.sh
@@ -0,0 +1,767 @@
+#!/usr/bin/env bash
+
+# netdata
+# real-time performance and health monitoring, done right!
+# (C) 2016 Costa Tsaousis <costa@tsaousis.gr>
+# GPL v3+
+#
+# Script the send alarm notifications for netdata
+#
+# Features:
+#  - multiple notification methods
+#  - multiple roles per alarm
+#  - multiple recipients per role
+#  - severity filtering per recipient
+#
+# Supported notification methods:
+#  - emails
+#  - pushover.net notifications
+#  - slack.com notifications
+#  - telegram.org notifications
+#
+
+me="${0}"
+
+# check for BASH v4+ (required for associative arrays)
+[ $(( ${BASH_VERSINFO[0]} )) -lt 4 ] && \
+    echo >&2 "${me}: BASH version 4 or later is required (this is ${BASH_VERSION})." && \
+    exit 1
+
+# defaults to allow running this script by hand
+NETDATA_CONFIG_DIR="${NETDATA_CONFIG_DIR-/etc/netdata}"
+NETDATA_CACHE_DIR="${NETDATA_CACHE_DIR-/var/cache/netdata}"
+[ -z "${NETDATA_REGISTRY_URL}" ] && NETDATA_REGISTRY_URL="https://registry.my-netdata.io"
+[ -z "${NETDATA_HOSTNAME}" ] && NETDATA_HOSTNAME="$(hostname)"
+[ -z "${NETDATA_REGISTRY_HOSTNAME}" ] && NETDATA_REGISTRY_HOSTNAME="${NETDATA_HOSTNAME}"
+
+# -----------------------------------------------------------------------------
+# parse command line parameters
+
+roles="${1}"       # the roles that should be notified for this event
+host="${2}"        # the host generated this event
+unique_id="${3}"   # the unique id of this event
+alarm_id="${4}"    # the unique id of the alarm that generated this event
+event_id="${5}"    # the incremental id of the event, for this alarm id
+when="${6}"        # the timestamp this event occurred
+name="${7}"        # the name of the alarm, as given in netdata health.d entries
+chart="${8}"       # the name of the chart (type.id)
+family="${9}"      # the family of the chart
+status="${10}"     # the current status : REMOVED, UNITIALIZED, UNDEFINED, CLEAR, WARNING, CRITICAL
+old_status="${11}" # the previous status: REMOVED, UNITIALIZED, UNDEFINED, CLEAR, WARNING, CRITICAL
+value="${12}"      # the current value of the alarm
+old_value="${13}"  # the previous value of the alarm
+src="${14}"        # the line number and file the alarm has been configured
+duration="${15}"   # the duration in seconds of the previous alarm state
+non_clear_duration="${16}" # the total duration in seconds this is/was non-clear
+units="${17}"      # the units of the value
+info="${18}"       # a short description of the alarm
+
+# -----------------------------------------------------------------------------
+# screen statuses we don't need to send a notification
+
+# don't do anything if this is not WARNING, CRITICAL or CLEAR
+if [ "${status}" != "WARNING" -a "${status}" != "CRITICAL" -a "${status}" != "CLEAR" ]
+then
+    echo >&2 "${me}: not sending notification for ${status} on '${chart}.${name}'"
+    exit 1
+fi
+
+# don't do anything if this is CLEAR, but it was not WARNING or CRITICAL
+if [ "${old_status}" != "WARNING" -a "${old_status}" != "CRITICAL" -a "${status}" = "CLEAR" ]
+then
+    echo >&2 "${me}: not sending notification for ${status} on '${chart}.${name}' (last status was ${old_status})"
+    exit 1
+fi
+
+# -----------------------------------------------------------------------------
+# load configuration
+
+# By default fetch images from the global public registry.
+# This is required by default, since all notification methods need to download
+# images via the Internet, and private registries might not be reachable.
+# This can be overwritten at the configuration file.
+images_base_url="https://registry.my-netdata.io"
+
+# needed commands
+# if empty they will be searched in the system path
+curl=
+sendmail=
+
+# enable / disable features
+SEND_SLACK="YES"
+SEND_PUSHOVER="YES"
+SEND_TELEGRAM="YES"
+SEND_EMAIL="YES"
+
+# slack configs
+SLACK_WEBHOOK_URL=
+DEFAULT_RECIPIENT_SLACK=
+declare -A role_recipients_slack=()
+
+# pushover configs
+PUSHOVER_APP_TOKEN=
+DEFAULT_RECIPIENT_PUSHOVER=
+declare -A role_recipients_pushover=()
+
+# telegram configs
+TELEGRAM_BOT_TOKEN=
+DEFAULT_RECIPIENT_TELEGRAM=
+declare -A role_recipients_telegram=()
+
+# email configs
+DEFAULT_RECIPIENT_EMAIL="root"
+declare -A role_recipients_email=()
+
+# load the user configuration
+# this will overwrite the variables above
+if [ -f "${NETDATA_CONFIG_DIR}/health_alarm_notify.conf" ]
+    then
+    source "${NETDATA_CONFIG_DIR}/health_alarm_notify.conf"
+fi
+
+# -----------------------------------------------------------------------------
+# filter a recipient based on alarm event severity
+
+filter_recipient_by_criticality() {
+    local method="${1}" x="${2}" r s
+    shift
+
+    r="${x/|*/}" # the recipient
+    s="${x/*|/}" # the severity required for notifying this recipient
+
+    # no severity filtering for this person
+    [ "${r}" = "${s}" ] && return 0
+
+    # the severity is invalid
+    s="${s^^}"
+    [ "${s}" != "CRITICAL" ] && return 0
+
+    # the new or the old status matches the severity
+    if [ "${s}" = "${status}" -o "${s}" = "${old_status}" ]
+        then
+        [ ! -d "${NETDATA_CACHE_DIR}/alarm-notify/${method}/${r}" ] && \
+            mkdir -p "${NETDATA_CACHE_DIR}/alarm-notify/${method}/${r}"
+
+        # we need to keep track of the notifications we sent
+        # so that the same user will receive the recovery
+        # even if old_status does not match the required severity
+        touch "${NETDATA_CACHE_DIR}/alarm-notify/${method}/${r}/${alarm_id}"
+        return 0
+    fi
+
+    # it is a cleared alarm we have sent notification for
+    if [ "${status}" != "WARNING" -a "${status}" != "CRITICAL" -a -f "${NETDATA_CACHE_DIR}/alarm-notify/${method}/${r}/${alarm_id}" ]
+        then
+        rm "${NETDATA_CACHE_DIR}/alarm-notify/${method}/${r}/${alarm_id}"
+        return 0
+    fi
+
+    return 1
+}
+
+# -----------------------------------------------------------------------------
+# find the recipients' addresses per method
+
+declare -A arr_slack=()
+declare -A arr_pushover=()
+declare -A arr_telegram=()
+declare -A arr_email=()
+
+# netdata may call us with multiple roles, and roles may have multiple but
+# overlapping recipients - so, here we find the unique recipients.
+for x in ${roles//,/ }
+do
+    # the roles 'silent' and 'disabled' mean:
+    # don't send a notification for this role
+    [ "${x}" = "silent" -o "${x}" = "disabled" ] && continue
+
+    # email
+    a="${role_recipients_email[${x}]}"
+    [ -z "${a}" ] && a="${DEFAULT_RECIPIENT_EMAIL}"
+    for r in ${a//,/ }
+    do
+        [ "${r}" != "disabled" ] && filter_recipient_by_criticality email "${r}" && arr_email[${r/|*/}]="1"
+    done
+
+    # pushover
+    a="${role_recipients_pushover[${x}]}"
+    [ -z "${a}" ] && a="${DEFAULT_RECIPIENT_PUSHOVER}"
+    for r in ${a//,/ }
+    do
+        [ "${r}" != "disabled" ] && filter_recipient_by_criticality pushover "${r}" && arr_pushover[${r/|*/}]="1"
+    done
+
+    # telegram
+    a="${role_recipients_telegram[${x}]}"
+    [ -z "${a}" ] && a="${DEFAULT_RECIPIENT_TELEGRAM}"
+    for r in ${a//,/ }
+    do
+        [ "${r}" != "disabled" ] && filter_recipient_by_criticality telegram "${r}" && arr_telegram[${r/|*/}]="1"
+    done
+
+    # slack
+    a="${role_recipients_slack[${x}]}"
+    [ -z "${a}" ] && a="${DEFAULT_RECIPIENT_SLACK}"
+    for r in ${a//,/ }
+    do
+        [ "${r}" != "disabled" ] && filter_recipient_by_criticality slack "${r}" && arr_slack[${r/|*/}]="1"
+    done
+done
+
+# build the list of slack recipients (channels)
+to_slack="${!arr_slack[*]}"
+[ -z "${to_slack}" ] && SEND_SLACK="NO"
+
+# build the list of pushover recipients (user tokens)
+to_pushover="${!arr_pushover[*]}"
+[ -z "${to_pushover}" ] && SEND_PUSHOVER="NO"
+
+# check array of telegram recipients (chat ids)
+to_telegram="${!arr_telegram[*]}"
+[ -z "${to_telegram}" ] && SEND_TELEGRAM="NO"
+
+# build the list of email recipients (email addresses)
+to_email=
+for x in "${!arr_email[@]}"
+do
+    [ ! -z "${to_email}" ] && to_email="${to_email}, "
+    to_email="${to_email}${x}"
+done
+[ -z "${to_email}" ] && SEND_EMAIL="NO"
+
+
+# -----------------------------------------------------------------------------
+# verify the delivery methods supported
+
+# check slack
+[ -z "${SLACK_WEBHOOK_URL}" ] && SEND_SLACK="NO"
+
+# check pushover
+[ -z "${PUSHOVER_APP_TOKEN}" ] && SEND_PUSHOVER="NO"
+
+# check telegram
+[ -z "${TELEGRAM_BOT_TOKEN}" ] && SEND_TELEGRAM="NO"
+
+if [ \( "${SEND_PUSHOVER}" = "YES" -o "${SEND_SLACK}" = "YES" -o "${SEND_TELEGRAM}" = "YES" \) -a -z "${curl}" ]
+    then
+    curl="$(which curl 2>/dev/null || command -v curl 2>/dev/null)"
+    if [ -z "${curl}" ]
+        then
+        SEND_PUSHOVER="NO"
+        SEND_TELEGRAM="NO"
+        SEND_SLACK="NO"
+    fi
+fi
+
+if [ "${SEND_EMAIL}" = "YES" -a -z "${sendmail}" ]
+    then
+    sendmail="$(which sendmail 2>/dev/null || command -v sendmail 2>/dev/null)"
+    [ -z "${sendmail}" ] && SEND_EMAIL="NO"
+fi
+
+# check that we have at least a method enabled
+if [ "${SEND_EMAIL}" != "YES" -a "${SEND_PUSHOVER}" != "YES" -a "${SEND_TELEGRAM}" != "YES" -a "${SEND_SLACK}" != "YES" ]
+    then
+    echo >&2 "All notification methods are disabled. Not sending a notification."
+    exit 1
+fi
+
+# -----------------------------------------------------------------------------
+# get the system hostname
+
+[ -z "${host}" ] && host="${NETDATA_HOSTNAME}"
+[ -z "${host}" ] && host="${NETDATA_REGISTRY_HOSTNAME}"
+[ -z "${host}" ] && host="$(hostname 2>/dev/null)"
+
+# -----------------------------------------------------------------------------
+# get the date the alarm happened
+
+date="$(date --date=@${when} 2>/dev/null)"
+[ -z "${date}" ] && date="$(date 2>/dev/null)"
+
+# -----------------------------------------------------------------------------
+# URL encode a string
+
+urlencode() {
+    local string="${1}" strlen encoded pos c o
+
+    strlen=${#string}
+    for (( pos=0 ; pos<strlen ; pos++ ))
+    do
+        c=${string:$pos:1}
+        case "$c" in
+            [-_.~a-zA-Z0-9])
+                o="${c}"
+                ;;
+
+            *)
+                printf -v o '%%%02x' "'$c"
+                ;;
+        esac
+        encoded+="${o}"
+    done
+
+    REPLY="${encoded}"
+    echo "${REPLY}"
+}
+
+# -----------------------------------------------------------------------------
+# convert a duration in seconds, to a human readable duration
+# using DAYS, MINUTES, SECONDS
+
+duration4human() {
+    local s="${1}" d=0 h=0 m=0 ds="day" hs="hour" ms="minute" ss="second" ret
+    d=$(( s / 86400 ))
+    s=$(( s - (d * 86400) ))
+    h=$(( s / 3600 ))
+    s=$(( s - (h * 3600) ))
+    m=$(( s / 60 ))
+    s=$(( s - (m * 60) ))
+
+    if [ ${d} -gt 0 ]
+    then
+        [ ${m} -ge 30 ] && h=$(( h + 1 ))
+        [ ${d} -gt 1 ] && ds="days"
+        [ ${h} -gt 1 ] && hs="hours"
+        if [ ${h} -gt 0 ]
+        then
+            ret="${d} ${ds} and ${h} ${hs}"
+        else
+            ret="${d} ${ds}"
+        fi
+    elif [ ${h} -gt 0 ]
+    then
+        [ ${s} -ge 30 ] && m=$(( m + 1 ))
+        [ ${h} -gt 1 ] && hs="hours"
+        [ ${m} -gt 1 ] && ms="minutes"
+        if [ ${m} -gt 0 ]
+        then
+            ret="${h} ${hs} and ${m} ${ms}"
+        else
+            ret="${h} ${hs}"
+        fi
+    elif [ ${m} -gt 0 ]
+    then
+        [ ${m} -gt 1 ] && ms="minutes"
+        [ ${s} -gt 1 ] && ss="seconds"
+        if [ ${s} -gt 0 ]
+        then
+            ret="${m} ${ms} and ${s} ${ss}"
+        else
+            ret="${m} ${ms}"
+        fi
+    else
+        [ ${s} -gt 1 ] && ss="seconds"
+        ret="${s} ${ss}"
+    fi
+
+    REPLY="${ret}"
+    echo "${REPLY}"
+}
+
+# -----------------------------------------------------------------------------
+# email sender
+
+send_email() {
+    local ret=
+    if [ "${SEND_EMAIL}" = "YES" ]
+        then
+
+        "${sendmail}" -t
+        ret=$?
+
+        if [ $ret -eq 0 ]
+        then
+            echo >&2 "${me}: Sent email notification for: ${host} ${chart}.${name} is ${status} to '${to_email}'"
+            return 0
+        else
+            echo >&2 "${me}: Failed to send email notification for: ${host} ${chart}.${name} is ${status} to '${to_email}' with error code ${ret}."
+            return 1
+        fi
+    fi
+
+    return 1
+}
+
+# -----------------------------------------------------------------------------
+# pushover sender
+
+send_pushover() {
+    local apptoken="${1}" usertokens="${2}" when="${3}" url="${4}" status="${5}" title="${6}" message="${7}" httpcode sent=0 user priority
+
+    if [ "${SEND_PUSHOVER}" = "YES" -a ! -z "${apptoken}" -a ! -z "${usertokens}" -a ! -z "${title}" -a ! -z "${message}" ]
+        then
+
+        # https://pushover.net/api
+        priority=-2
+        case "${status}" in
+            CLEAR) priority=-1;;   # low priority: no sound or vibration
+            WARNING) priotity=0;;  # normal priority: respect quiet hours
+            CRITICAL) priority=1;; # high priority: bypass quiet hours
+            *) priority=-2;;       # lowest priority: no notification at all
+        esac
+
+        for user in ${usertokens}
+        do
+            httpcode=$(${curl} --write-out %{http_code} --silent --output /dev/null \
+                --form-string "token=${apptoken}" \
+                --form-string "user=${user}" \
+                --form-string "html=1" \
+                --form-string "title=${title}" \
+                --form-string "message=${message}" \
+                --form-string "timestamp=${when}" \
+                --form-string "url=${url}" \
+                --form-string "url_title=Open netdata dashboard to view the alarm" \
+                --form-string "priority=${priority}" \
+                https://api.pushover.net/1/messages.json)
+
+            if [ "${httpcode}" == "200" ]
+            then
+                echo >&2 "${me}: Sent pushover notification for: ${host} ${chart}.${name} is ${status} to '${user}'"
+                sent=$((sent + 1))
+            else
+                echo >&2 "${me}: Failed to send pushover notification for: ${host} ${chart}.${name} is ${status} to '${user}' with HTTP error code ${httpcode}."
+            fi
+        done
+
+        [ ${sent} -gt 0 ] && return 0
+    fi
+
+    return 1
+}
+
+
+# -----------------------------------------------------------------------------
+# telegram sender
+
+send_telegram() {
+    local bottoken="${1}" chatids="${2}" message="${3}" httpcode sent=0 chatid disableNotification=""
+
+    if [ "${status}" = "CLEAR" ]; then disableNotification="--data-urlencode disable_notification=true"; fi
+
+    if [ "${SEND_TELEGRAM}" = "YES" -a ! -z "${bottoken}" -a ! -z "${chatids}" -a ! -z "${message}" ];
+    then
+        for chatid in ${chatids}
+        do
+            # https://core.telegram.org/bots/api#sendmessage
+            httpcode=$(${curl} --write-out %{http_code} --silent --output /dev/null ${disableNotification} \
+                --data-urlencode "parse_mode=HTML" \
+                --data-urlencode "disable_web_page_preview=true" \
+                --data-urlencode "text=$message" \
+                "https://api.telegram.org/bot${bottoken}/sendMessage?chat_id=$chatid")
+
+            if [ "${httpcode}" == "200" ]
+            then
+                echo >&2 "${me}: Sent telegram notification for: ${host} ${chart}.${name} is ${status} to '${chatid}'"
+                sent=$((sent + 1))
+            elif [ "${httpcode}" == "401" ]
+            then
+                echo >&2 "${me}: Failed to send telegram notification for: ${host} ${chart}.${name} is ${status} to '${chatid}': Wrong bot token."
+            else
+                echo >&2 "${me}: Failed to send telegram notification for: ${host} ${chart}.${name} is ${status} to '${chatid}' with HTTP error code ${httpcode}."
+            fi
+        done
+
+        [ ${sent} -gt 0 ] && return 0
+    fi
+
+    return 1
+}
+
+# -----------------------------------------------------------------------------
+# slack sender
+
+send_slack() {
+    local webhook="${1}" channels="${2}" httpcode sent=0 channel color payload
+
+    [ "${SEND_SLACK}" != "YES" ] && return 1
+
+    case "${status}" in
+        WARNING) color="warning" ;;
+        CRITICAL) color="danger" ;;
+        CLEAR) color="good" ;;
+        *) color="#777777" ;;
+    esac
+
+    for channel in ${channels}
+    do
+        payload="$(cat <<EOF
+        {
+            "channel": "#${channel}",
+            "username": "netdata on ${host}",
+            "icon_url": "${images_base_url}/images/seo-performance-128.png",
+            "text": "${host} ${status_message}, \`${chart}\` (_${family}_), *${alarm}*",
+            "attachments": [
+                {
+                    "fallback": "${alarm} - ${chart} (${family}) - ${info}",
+                    "color": "${color}",
+                    "title": "${alarm}",
+                    "title_link": "${goto_url}",
+                    "text": "${info}",
+                    "fields": [
+                        {
+                            "title": "${chart}",
+                            "short": true
+                        },
+                        {
+                            "title": "${family}",
+                            "short": true
+                        }
+                    ],
+                    "thumb_url": "${image}",
+                    "footer": "<${goto_url}|${host}>",
+                    "ts": ${when}
+                }
+            ]
+        }
+EOF
+        )"
+
+        httpcode=$(${curl} --write-out %{http_code} --silent --output /dev/null -X POST --data-urlencode "payload=${payload}" "${webhook}")
+        if [ "${httpcode}" == "200" ]
+        then
+            echo >&2 "${me}: Sent slack notification for: ${host} ${chart}.${name} is ${status} to '${channel}'"
+            sent=$((sent + 1))
+        else
+            echo >&2 "${me}: Failed to send slack notification for: ${host} ${chart}.${name} is ${status} to '${channel}', with HTTP error code ${httpcode}."
+        fi
+    done
+
+    [ ${sent} -gt 0 ] && return 0
+
+    return 1
+}
+
+
+# -----------------------------------------------------------------------------
+# prepare the content of the notification
+
+# the url to send the user on click
+urlencode "${NETDATA_REGISTRY_HOSTNAME}" >/dev/null; url_host="${REPLY}"
+urlencode "${chart}" >/dev/null; url_chart="${REPLY}"
+urlencode "${family}" >/dev/null; url_family="${REPLY}"
+urlencode "${name}" >/dev/null; url_name="${REPLY}"
+goto_url="${NETDATA_REGISTRY_URL}/goto-host-from-alarm.html?host=${url_host}&chart=${url_chart}&family=${url_family}&alarm=${url_name}&alarm_unique_id=${unique_id}&alarm_id=${alarm_id}&alarm_event_id=${event_id}"
+
+# the severity of the alarm
+severity="${status}"
+
+# the time the alarm was raised
+duration4human ${duration} >/dev/null; duration_txt="${REPLY}"
+duration4human ${non_clear_duration} >/dev/null; non_clear_duration_txt="${REPLY}"
+raised_for="(was ${old_status,,} for ${duration_txt})"
+
+# the key status message
+status_message="status unknown"
+
+# the color of the alarm
+color="grey"
+
+# the alarm value
+alarm="${name//_/ } = ${value} ${units}"
+
+# the image of the alarm
+image="${images_base_url}/images/seo-performance-128.png"
+
+# prepare the title based on status
+case "${status}" in
+	CRITICAL)
+        image="${images_base_url}/images/alert-128-red.png"
+        status_message="is critical"
+        color="#ca414b"
+        ;;
+
+    WARNING)
+        image="${images_base_url}/images/alert-128-orange.png"
+        status_message="needs attention"
+        color="#caca4b"
+		;;
+
+	CLEAR)
+        image="${images_base_url}/images/check-mark-2-128-green.png"
+    	status_message="recovered"
+		color="#77ca6d"
+
+		# don't show the value when the status is CLEAR
+		# for certain alarms, this value might not have any meaning
+		alarm="${name//_/ } ${raised_for}"
+		;;
+esac
+
+if [ "${status}" = "CLEAR" ]
+then
+    severity="Recovered from ${old_status}"
+    if [ $non_clear_duration -gt $duration ]
+    then
+        raised_for="(alarm was raised for ${non_clear_duration_txt})"
+    fi
+
+elif [ "${old_status}" = "WARNING" -a "${status}" = "CRITICAL" ]
+then
+    severity="Escalated to ${status}"
+    if [ $non_clear_duration -gt $duration ]
+    then
+        raised_for="(alarm is raised for ${non_clear_duration_txt})"
+    fi
+
+elif [ "${old_status}" = "CRITICAL" -a "${status}" = "WARNING" ]
+then
+    severity="Demoted to ${status}"
+    if [ $non_clear_duration -gt $duration ]
+    then
+        raised_for="(alarm is raised for ${non_clear_duration_txt})"
+    fi
+
+else
+    raised_for=
+fi
+
+# prepare HTML versions of elements
+info_html=
+[ ! -z "${info}" ] && info_html=" <small><br/>${info}</small>"
+
+raised_for_html=
+[ ! -z "${raised_for}" ] && raised_for_html="<br/><small>${raised_for}</small>"
+
+# -----------------------------------------------------------------------------
+# send the slack notification
+
+# slack aggregates posts from the same username
+# so we use "${host} ${status}" as the bot username, to make them diff
+
+send_slack "${SLACK_WEBHOOK_URL}" "${to_slack}"
+SENT_SLACK=$?
+
+# -----------------------------------------------------------------------------
+# send the pushover notification
+
+send_pushover "${PUSHOVER_APP_TOKEN}" "${to_pushover}" "${when}" "${goto_url}" "${status}" "${host} ${status_message} - ${name//_/ } - ${chart}" "
+<font color=\"${color}\"><b>${alarm}</b></font>${info_html}<br/>&nbsp;
+<small><b>${chart}</b><br/>Chart<br/>&nbsp;</small>
+<small><b>${family}</b><br/>Family<br/>&nbsp;</small>
+<small><b>${severity}</b><br/>Severity<br/>&nbsp;</small>
+<small><b>${date}${raised_for_html}</b><br/>Time<br/>&nbsp;</small>
+<a href=\"${goto_url}\">View Netdata</a><br/>&nbsp;
+<small><small>The source of this alarm is line ${src}</small></small>
+"
+
+SENT_PUSHOVER=$?
+
+# -----------------------------------------------------------------------------
+# send the telegram.org message
+
+# https://core.telegram.org/bots/api#formatting-options
+telegram_message="<b>${severity}"
+[ "${status_message}" != "recovered" ] && telegram_message="${telegram_message}, ${status_message}"
+telegram_message="${telegram_message}
+${chart} (${family})</b>
+<a href=\"${goto_url}\">${alarm}</a>
+<i>${info}</i>"
+
+send_telegram "${TELEGRAM_BOT_TOKEN}" "${to_telegram}" "${telegram_message}"
+
+SENT_TELEGRAM=$?
+
+# -----------------------------------------------------------------------------
+# send the email
+
+send_email <<EOF
+To: ${to_email}
+Subject: ${host} ${status_message} - ${name//_/ } - ${chart}
+Content-Type: text/html
+
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" style="font-family: 'Helvetica Neue', 'Helvetica', Helvetica, Arial, sans-serif; box-sizing: border-box; font-size: 14px; margin: 0; padding: 0;">
+<body style="font-family: 'Helvetica Neue', 'Helvetica', Helvetica, Arial, sans-serif; font-size: 14px; width: 100% !important; min-height: 100%; line-height: 1.6; background: #f6f6f6; margin:0; padding: 0;">
+<table>
+    <tbody>
+    <tr>
+        <td style="vertical-align: top;" valign="top"></td>
+        <td width="700" style="vertical-align: top; display: block !important; max-width: 700px !important; clear: both !important; margin: 0 auto; padding: 0;" valign="top">
+            <div style="max-width: 700px; display: block; margin: 0 auto; padding: 20px;">
+                <table width="100%" cellpadding="0" cellspacing="0" style="background: #fff; border: 1px solid #e9e9e9;">
+                    <tbody>
+                    <tr>
+                        <td bgcolor="#eee" style="padding: 5px 20px 5px 20px; background-color: #eee;">
+                            <div style="font-family: 'Helvetica Neue', 'Helvetica', Helvetica, Arial, sans-serif; font-size: 20px; color: #777; font-weight: bold;">netdata notification</div>
+                        </td>
+                    </tr>
+                    <tr>
+                        <td bgcolor="${color}" style="font-size: 16px; vertical-align: top; font-weight: 400; text-align: center; margin: 0; padding: 10px; color: #ffffff; background: ${color} !important; border: 1px solid ${color}; border-top-color: ${color};" align="center" valign="top">
+                            <h1 style="font-family: 'Helvetica Neue', 'Helvetica', Helvetica, Arial, sans-serif; font-weight: 400; margin: 0;">${host} ${status_message}</h1>
+                        </td>
+                    </tr>
+                    <tr>
+                        <td style="vertical-align: top;" valign="top">
+                            <div style="margin: 0; padding: 20px; max-width: 700px;">
+                                <table width="100%" cellpadding="0" cellspacing="0" style="max-width:700px">
+                                    <tbody>
+                                    <tr>
+                                        <td style="font-family: 'Helvetica Neue', 'Helvetica', Helvetica, Arial, sans-serif; font-size: 18px; vertical-align: top; margin: 0; padding:0 0 20px;" align="left" valign="top">
+                                            <span>${chart}</span>
+                                            <span style="display: block; color: #666666; font-size: 12px; font-weight: 300; line-height: 1; text-transform: uppercase;">Chart</span>
+                                        </td>
+                                    </tr>
+                                    <tr style="margin: 0; padding: 0;">
+                                        <td style="font-family: 'Helvetica Neue', 'Helvetica', Helvetica, Arial, sans-serif; font-size: 18px; vertical-align: top; margin: 0; padding: 0 0 20px;" align="left" valign="top">
+                                            <span><b>${alarm}</b>${info_html}</span>
+                                            <span style="display: block; color: #666666; font-size: 12px; font-weight: 300; line-height: 1; text-transform: uppercase;">Alarm</span>
+                                        </td>
+                                    </tr>
+                                    <tr>
+                                        <td style="font-family: 'Helvetica Neue', 'Helvetica', Helvetica, Arial, sans-serif; font-size: 18px; vertical-align: top; margin: 0; padding: 0 0 20px;" align="left" valign="top">
+                                            <span>${family}</span>
+                                            <span style="display: block; color: #666666; font-size: 12px; font-weight: 300; line-height: 1; text-transform: uppercase;">Family</span>
+                                        </td>
+                                    </tr>
+                                    <tr style="margin: 0; padding: 0;">
+                                        <td style="font-family: 'Helvetica Neue', 'Helvetica', Helvetica, Arial, sans-serif; font-size: 18px; vertical-align: top; margin: 0; padding: 0 0 20px;" align="left" valign="top">
+                                            <span>${severity}</span>
+                                            <span style="display: block; color: #666666; font-size: 12px; font-weight: 300; line-height: 1; text-transform: uppercase;">Severity</span>
+                                        </td>
+                                    </tr>
+                                    <tr style="margin: 0; padding: 0;">
+                                        <td style="font-family: 'Helvetica Neue', 'Helvetica', Helvetica, Arial, sans-serif; font-size: 18px; vertical-align: top; margin: 0; padding: 0 0 20px;" align="left" valign="top"><span>${date}</span>
+                                            <span>${raised_for_html}</span> <span style="display: block; color: #666666; font-size: 12px; font-weight: 300; line-height: 1; text-transform: uppercase;">Time</span>
+                                        </td>
+                                    </tr>
+                                    <tr style="margin: 0; padding: 0;">
+                                        <td style="font-family: 'Helvetica Neue', 'Helvetica', Helvetica, Arial, sans-serif; font-size: 18px; vertical-align: top; margin: 0; padding: 0 0 20px;">
+                                            <a href="${goto_url}" style="font-size: 14px; color: #ffffff; text-decoration: none; line-height: 1.5; font-weight: bold; text-align: center; display: inline-block; text-transform: capitalize; background: #35568d; border-width: 1px; border-style: solid; border-color: #2b4c86; margin: 0; padding: 10px 15px;" target="_blank">View Netdata</a>
+                                        </td>
+                                    </tr>
+                                    <tr style="text-align: center; margin: 0; padding: 0;">
+                                        <td style="font-family: 'Helvetica Neue', 'Helvetica', Helvetica, Arial, sans-serif; font-size: 11px; vertical-align: top; margin: 0; padding: 10px 0 0 0; color: #666666;" align="center" valign="bottom">The source of this alarm is line <code>${src}</code>
+                                        </td>
+                                    </tr>
+                                    <tr style="text-align: center; margin: 0; padding: 0;">
+                                        <td style="font-family: 'Helvetica Neue', 'Helvetica', Helvetica, Arial, sans-serif; font-size: 12px; vertical-align: top; margin:0; padding: 20px 0 0 0; color: #666666; border-top: 1px solid #f0f0f0;" align="center" valign="bottom">Sent by
+                                            <a href="https://mynetdata.io/" target="_blank">netdata</a>, the real-time performance monitoring.
+                                        </td>
+                                    </tr>
+                                    </tbody>
+                                </table>
+                            </div>
+                        </td>
+                    </tr>
+                    </tbody>
+                </table>
+            </div>
+        </td>
+    </tr>
+    </tbody>
+</table>
+</body>
+</html>
+EOF
+
+SENT_EMAIL=$?
+
+# -----------------------------------------------------------------------------
+# let netdata know
+
+# we did send something
+[ ${SENT_EMAIL} -eq 0 -o ${SENT_PUSHOVER} -eq 0 -o ${SENT_TELEGRAM} -eq 0 -o ${SENT_SLACK} -eq 0 ] && exit 0
+
+# we did not send anything
+exit 1
diff --git a/plugins.d/cgroup-name.sh b/plugins.d/cgroup-name.sh
index 8bfc984c2..1c6f564b4 100755
--- a/plugins.d/cgroup-name.sh
+++ b/plugins.d/cgroup-name.sh
@@ -71,7 +71,7 @@ if [ -z "${NAME}" ]
     fi
 
     [ -z "${NAME}" ] && NAME="${CGROUP}"
-    [ ${#NAME} -gt 50 ] && NAME="${NAME:0:50}"
+    [ ${#NAME} -gt 100 ] && NAME="${NAME:0:100}"
 fi
 
 echo >&2 "${0}: cgroup '${CGROUP}' is called '${NAME}'"
diff --git a/plugins.d/charts.d.plugin b/plugins.d/charts.d.plugin
index 9aaadc168..df9998ece 100755
--- a/plugins.d/charts.d.plugin
+++ b/plugins.d/charts.d.plugin
@@ -48,10 +48,6 @@ require_cmd awk || exit 1
 # insternal defaults
 # netdata exposes a few environment variables for us
 
-pause_method="sleep" # use either "suspend" or "sleep"
-                     # DO NOT USE SUSPEND - LINUX WILL SUSPEND NETDATA TOO
-                     # THE WHOLE PROCESS GROUP - NOT JUST THE SHELL
-
 pluginsd="${NETDATA_PLUGINS_DIR}"
 [ -z "$pluginsd" ] && pluginsd="$( dirname $PROGRAM_FILE )"
 
@@ -154,6 +150,24 @@ done
 
 
 # -----------------------------------------------------------------------------
+# loop control
+
+# default sleep function
+LOOPSLEEPMS_HIGHRES=0
+now_ms=
+current_time_ms_default() {
+    now_ms="$(date +'%s')000"
+}
+current_time_ms="current_time_ms_default"
+current_time_ms_accuracy=1
+mysleep="sleep"
+
+# if found and included, this file overwrites loopsleepms()
+# and current_time_ms() with a high resolution timer function
+# for precise looping.
+. "$pluginsd/loopsleepms.sh.inc"
+
+# -----------------------------------------------------------------------------
 # load my configuration
 
 if [ -f "$myconfig" ]
@@ -172,13 +186,6 @@ else
     echo >&2 "$PROGRAM_NAME: configuration file '$myconfig' not found. Using defaults."
 fi
 
-if [ "$pause_method" = "suspend" ]
-then
-    # enable bash job control
-    # this is required for suspend to work
-    set -m
-fi
-
 # we check for the timeout command, after we load our
 # configuration, so that the user may overwrite the
 # timeout command we use, providing a function that
@@ -205,27 +212,6 @@ fi
 
 
 # -----------------------------------------------------------------------------
-# loop control
-
-# default sleep function
-LOOPSLEEPMS_HIGHRES=0
-loopsleepms() {
-    [ "$1" = "tellwork" ] && shift
-    sleep $1
-}
-
-now_ms=
-current_time_ms() {
-    now_ms="$(date +'%s')000"
-}
-
-# if found and included, this file overwrites loopsleepms()
-# and current_time_ms() with a high resolution timer function
-# for precise looping.
-. "$pluginsd/loopsleepms.sh.inc"
-
-
-# -----------------------------------------------------------------------------
 # library functions
 
 fixid() {
@@ -537,7 +523,7 @@ global_update() {
         next_ms x seconds millis
 
     # return the current time in ms in $now_ms
-    current_time_ms
+    ${current_time_ms}
 
     exit_at=$(( now_ms + (restart_timeout * 1000) ))
 
@@ -562,16 +548,16 @@ global_update() {
         next_charts=()
 
         # return the current time in ms in $now_ms
-        current_time_ms
+        ${current_time_ms}
 
         for chart in "${now_charts[@]}"
         do
-            # echo >&2 "DEBUG: chart: $chart last: ${charts_last_update[$chart]}, next: ${charts_next_update[$chart]}, now: ${now_ms}"
+            #echo >&2 "                              DEBUG: chart: $chart last: ${charts_last_update[$chart]}, next: ${charts_next_update[$chart]}, now: ${now_ms}"
             if [ ${now_ms} -ge ${charts_next_update[$chart]} ]
             then
                 last_ms=${charts_last_update[$chart]}
                 dt=$(( (now_ms - last_ms) ))
-                # echo >&2 "DEBUG: chart: $chart last: ${charts_last_update[$chart]}, next: ${charts_next_update[$chart]}, now: ${now_ms}, dt: ${dt}"
+                #echo >&2 "                              DEBUG: chart: $chart last: ${charts_last_update[$chart]}, next: ${charts_next_update[$chart]}, now: ${now_ms}, dt: ${dt}"
 
                 charts_last_update[$chart]=${now_ms}
 
@@ -590,11 +576,12 @@ global_update() {
                 fi
 
                 exec_start_ms=$now_ms
+                #echo >&2 "                              EXEC: $chart$charts_update $dt"
                 $chart$charts_update $dt
                 ret=$?
 
                 # return the current time in ms in $now_ms
-                current_time_ms; exec_end_ms=$now_ms
+                ${current_time_ms}; exec_end_ms=$now_ms
 
                 echo "BEGIN netdata.plugin_chartsd_$chart $dt"
                 echo "SET run_time = $(( exec_end_ms - exec_start_ms ))"
@@ -620,27 +607,29 @@ global_update() {
             fi
         done
 
-        if [ "$pause_method" = "suspend" ]
-        then
-            echo "STOPPING_WAKE_ME_UP_PLEASE"
-            suspend || ( echo >&2 "$PROGRAM_NAME: suspend returned error $?, falling back to sleep."; loopsleepms $debug_time $update_every $time_divisor)
-        else
-            # wait the time you are required to
-            next_ms=$((now_ms + (update_every * 1000 * 100) ))
-            for x in "${charts_next_update[@]}"; do [ ${x} -lt ${next_ms} ] && next_ms=${x}; done
-            next_ms=$((next_ms - now_ms))
+        # wait the time you are required to
+        next_ms=$((now_ms + (update_every * 1000 * 100) ))
+        for x in "${charts_next_update[@]}"; do [ ${x} -lt ${next_ms} ] && next_ms=${x}; done
+        next_ms=$((next_ms - now_ms))
 
-            if [ ${LOOPSLEEPMS_HIGHRES} -eq 1 -a ${next_ms} -gt 0 ]
+        if [ ${LOOPSLEEPMS_HIGHRES} -eq 1 -a ${next_ms} -gt 0 ]
+            then
+            next_ms=$(( next_ms + current_time_ms_accuracy ))
+            seconds=$(( next_ms / 1000 ))
+            millis=$(( next_ms % 1000 ))
+            if [ ${millis} -lt 10  ]
                 then
-                seconds=$(( next_ms / 1000 ))
-                millis=$(( next_ms % 1000 ))
-                [ ${millis} -lt 10  ] && millis="0${millis}"
-                [ ${millis} -lt 100 ] && millis="0${millis}"
-                [ $debug -eq 1 ] && echo >&2 "$PROGRAM_NAME: sleeping for ${seconds}.${millis} seconds."
-                sleep ${seconds}.${millis}
-            else
-                sleep $update_every
+                millis="00${millis}"
+            elif [ ${millis} -lt 100 ]
+                then
+                millis="0${millis}"
             fi
+
+            [ $debug -eq 1 ] && echo >&2 "$PROGRAM_NAME: sleeping for ${seconds}.${millis} seconds."
+            ${mysleep} ${seconds}.${millis}
+        else
+            [ $debug -eq 1 ] && echo >&2 "$PROGRAM_NAME: sleeping for ${update_every} seconds."
+            ${mysleep} $update_every
         fi
 
         test ${now_ms} -ge ${exit_at} && exit 0
diff --git a/plugins.d/loopsleepms.sh.inc b/plugins.d/loopsleepms.sh.inc
index 02ab694d2..6de93043c 100644
--- a/plugins.d/loopsleepms.sh.inc
+++ b/plugins.d/loopsleepms.sh.inc
@@ -1,10 +1,5 @@
 # no need for shebang - this file is included from other scripts
 
-# this function is used to sleep a fraction of a second
-# it calculates the difference between every time is called
-# and tries to align the sleep time to give you exactly the
-# loop you need.
-
 LOOPSLEEP_DATE="$(which date)"
 if [ -z "$LOOPSLEEP_DATE" ]
     then
@@ -12,17 +7,14 @@ if [ -z "$LOOPSLEEP_DATE" ]
     exit 1
 fi
 
-LOOPSLEEPMS_LASTRUN=0
-LOOPSLEEPMS_LASTSLEEP=0
-LOOPSLEEPMS_LASTWORK=0
+# -----------------------------------------------------------------------------
+# use the date command as a high resolution timer
 
+now_ms=
 LOOPSLEEPMS_HIGHRES=1
 test "$($LOOPSLEEP_DATE +%N)" = "%N" && LOOPSLEEPMS_HIGHRES=0
-
-now_ms=
-current_time_ms() {
-    # if high resolution is not supported
-    # just sleep the time requested, in seconds
+test -z "$($LOOPSLEEP_DATE +%N)"     && LOOPSLEEPMS_HIGHRES=0
+current_time_ms_from_date() {
     if [ $LOOPSLEEPMS_HIGHRES -eq 0 ]
     then
         now_ms="$($LOOPSLEEP_DATE +'%s')000"
@@ -31,60 +23,167 @@ current_time_ms() {
     fi
 }
 
+# -----------------------------------------------------------------------------
+# use /proc/uptime as a high resolution timer
+
+current_time_ms_from_date
+current_time_ms_from_uptime_started="${now_ms}"
+current_time_ms_from_uptime_last="${now_ms}"
+current_time_ms_from_uptime_first=0
+current_time_ms_from_uptime() {
+    local up rest arr=() n
+
+    read up rest </proc/uptime
+    if [ $? -ne 0 ]
+        then
+        echo >&2 "$0: Cannot read /proc/uptime - falling back to current_time_ms_from_date()."
+        current_time_ms="current_time_ms_from_date"
+        current_time_ms_from_date
+        current_time_ms_accuracy=1
+        return
+    fi
+
+    arr=(${up//./ })
+
+    if [ ${#arr[1]} -lt 1 ]
+        then
+        n="${arr[0]}000"
+    elif [ ${#arr[1]} -lt 2 ]
+        then
+        n="${arr[0]}${arr[1]}00"
+    elif [ ${#arr[1]} -lt 3 ]
+        then
+        n="${arr[0]}${arr[1]}0"
+    else
+        n="${arr[0]}${arr[1]}"
+    fi
+
+    now_ms=$((current_time_ms_from_uptime_started - current_time_ms_from_uptime_first + n))
+
+    if [ "${now_ms}" -lt "${current_time_ms_from_uptime_last}" ]
+        then
+        echo >&2 "$0: Cannot use current_time_ms_from_uptime() - new time ${now_ms} is older than the last ${current_time_ms_from_uptime_last} - falling back to current_time_ms_from_date()."
+        current_time_ms="current_time_ms_from_date"
+        current_time_ms_from_date
+        current_time_ms_accuracy=1
+    fi
+
+    current_time_ms_from_uptime_last="${now_ms}"
+}
+current_time_ms_from_uptime
+current_time_ms_from_uptime_first="$((now_ms - current_time_ms_from_uptime_started))"
+current_time_ms_from_uptime_last="${current_time_ms_from_uptime_first}"
+current_time_ms="current_time_ms_from_uptime"
+current_time_ms_accuracy=10
+if [ "${current_time_ms_from_uptime_first}" -eq 0 ]
+    then
+    echo >&2 "$0: Invalid setup for current_time_ms_from_uptime() - falling back to current_time_ms_from_date()."
+    current_time_ms="current_time_ms_from_date"
+    current_time_ms_accuracy=1
+fi
+
+# -----------------------------------------------------------------------------
+# use read with timeout for sleep
+
+mysleep="mysleep_read"
+
+mysleep_fifo="${NETDATA_CACHE_DIR-/tmp}/.netdata_bash_sleep_timer_fifo"
+[ ! -e "${mysleep_fifo}" ] && mkfifo "${mysleep_fifo}"
+[ ! -e "${mysleep_fifo}" ] && mysleep="sleep"
+
+mysleep_read() {
+    read -t "${1}" <>"${mysleep_fifo}"
+    ret=$?
+    if [ $ret -le 128 ]
+        then
+        echo >&2 "$0: Cannot use read for sleeping (return code ${ret})."
+        mysleep="sleep"
+        ${mysleep} "${1}"
+    fi
+}
+
+
+# -----------------------------------------------------------------------------
+# this function is used to sleep a fraction of a second
+# it calculates the difference between every time is called
+# and tries to align the sleep time to give you exactly the
+# loop you need.
+
+LOOPSLEEPMS_LASTRUN=0
+LOOPSLEEPMS_NEXTRUN=0
+LOOPSLEEPMS_LASTSLEEP=0
+LOOPSLEEPMS_LASTWORK=0
+
 loopsleepms() {
-    local tellwork=0 t="$1" div s m now mstosleep
+    local tellwork=0 t="${1}" div s m now mstosleep
 
-    if [ "$t" = "tellwork" ]
+    if [ "${t}" = "tellwork" ]
     then
         tellwork=1
         shift
-        t="$1"
+        t="${1}"
     fi
-    div="${2-100}"
 
     # $t = the time in seconds to wait
 
     # if high resolution is not supported
     # just sleep the time requested, in seconds
-    if [ $LOOPSLEEPMS_HIGHRES -eq 0 ]
+    if [ ${LOOPSLEEPMS_HIGHRES} -eq 0 ]
     then
-        sleep $t
+        sleep ${t}
         return
     fi
 
-    # get the current time, in ms
-    # milliseconds since epoch (1-1-1970)
-    now="$(( $( $LOOPSLEEP_DATE +'%s * 1000 + %-N / 1000000' ) ))"
-
-    # calculate required sleep in ms
-    t=$((t * 1000 * div / 100))
-
-    # this is our first run
-    # just wait the requested time
-    test $LOOPSLEEPMS_LASTRUN -eq 0 && LOOPSLEEPMS_LASTRUN=$now
+    # get the current time, in ms in ${now_ms}
+    ${current_time_ms}
 
     # calculate ms since last run
-    LOOPSLEEPMS_LASTWORK=$((now - LOOPSLEEPMS_LASTRUN - LOOPSLEEPMS_LASTSLEEP))
+    [ ${LOOPSLEEPMS_LASTRUN} -gt 0 ] && \
+        LOOPSLEEPMS_LASTWORK=$((now_ms - LOOPSLEEPMS_LASTRUN - LOOPSLEEPMS_LASTSLEEP))
     # echo "# last loop's work took $LOOPSLEEPMS_LASTWORK ms"
+    
+    # remember this run
+    LOOPSLEEPMS_LASTRUN=${now_ms}
+
+    # calculate the next run
+    LOOPSLEEPMS_NEXTRUN=$(( ( now_ms - ( now_ms % ( t * 1000 ) ) ) + ( t * 1000 ) ))
 
     # calculate ms to sleep
-    mstosleep=$(( t - LOOPSLEEPMS_LASTWORK ))
+    mstosleep=$(( LOOPSLEEPMS_NEXTRUN - now_ms + current_time_ms_accuracy ))
     # echo "# mstosleep is $mstosleep ms"
 
     # if we are too slow, sleep some time
-    test $mstosleep -lt 200 && mstosleep=200
+    test ${mstosleep} -lt 200 && mstosleep=200
 
-    s=$((mstosleep / 1000))
-    m=$((mstosleep - (s * 1000)))
+    s=$(( mstosleep / 1000 ))
+    m=$(( mstosleep - (s * 1000) ))
+    [ "${m}" -lt 100 ] && m="0${m}"
+    [ "${m}" -lt 10  ] && m="0${m}"
 
-    test $tellwork -eq 1 && echo >&2 " >>> PERFORMANCE >>> WORK TOOK $LOOPSLEEPMS_LASTWORK ms ( $((LOOPSLEEPMS_LASTWORK * 100 / 1000)).$((LOOPSLEEPMS_LASTWORK % 10))% cpu ) >>> SLEEPING $mstosleep ms"
+    test $tellwork -eq 1 && echo >&2 " >>> PERFORMANCE >>> WORK TOOK ${LOOPSLEEPMS_LASTWORK} ms ( $((LOOPSLEEPMS_LASTWORK * 100 / 1000)).$((LOOPSLEEPMS_LASTWORK % 10))% cpu ) >>> SLEEPING ${mstosleep} ms"
 
-    # echo "# sleeping $s.$m"
+    # echo "# sleeping ${s}.${m}"
     # echo
-    sleep $s.$m
+    ${mysleep} ${s}.${m}
 
     # keep the values we need
     # for our next run
-    LOOPSLEEPMS_LASTRUN=$now
     LOOPSLEEPMS_LASTSLEEP=$mstosleep
 }
+
+# test it
+#while [ 1 ]
+#do
+#    r=$(( (RANDOM * 2000 / 32767) ))
+#    s=$((r / 1000))
+#    m=$((r - (s * 1000)))
+#    [ "${m}" -lt 100 ] && m="0${m}"
+#    [ "${m}" -lt 10  ] && m="0${m}"
+#    echo "${r} = ${s}.${m}"
+#
+#    # the work
+#    ${mysleep} ${s}.${m}
+#
+#    # the alignment loop
+#    loopsleepms tellwork 1
+#done
diff --git a/plugins.d/tc-qos-helper.sh b/plugins.d/tc-qos-helper.sh
index bff5217d2..9caef85f7 100755
--- a/plugins.d/tc-qos-helper.sh
+++ b/plugins.d/tc-qos-helper.sh
@@ -27,16 +27,9 @@ if [ -f "${config_dir}/tc-qos-helper.conf" ]
     source "${config_dir}/tc-qos-helper.conf"
 fi
 
-# default time function
-now_ms=
-current_time_ms() {
-    now_ms="$(date +'%s')000"
-}
-
 # default sleep function
 LOOPSLEEPMS_LASTWORK=0
 loopsleepms() {
-    [ "$1" = "tellwork" ] && shift
     sleep $1
 }