New upstream version 1.4.0+dfsgupstream/1.4.0+dfsg

1 files changed, 767 insertions, 0 deletions

diff --git a/plugins.d/alarm-notify.sh b/plugins.d/alarm-notify.sh
new file mode 100755
index 00000000..feec6cea
--- /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