]> arthur.barton.de Git - netdata.git/blobdiff - plugins.d/alarm-notify.sh
Merge pull request #1070 from tperalta82/master
[netdata.git] / plugins.d / alarm-notify.sh
index ca70c64b949edc44bfd022329d7025855417b149..a41c55bc70c520896bb0e9e0c059da51d1f3c6df 100755 (executable)
 #!/usr/bin/env bash
 
-# (C) Costa Tsaousis
-# pushover support by Jan Arnold
+# netdata
+# real-time performance and health monitoring, done right!
+# (C) 2016 Costa Tsaousis <costa@tsaousis.gr>
+# GPL v3+
+#
+# Script to 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
+#  - pushbullet.com push notifications
+#  - slack.com notifications
+#  - telegram.org notifications
+#
+
+export PATH="${PATH}:/sbin:/usr/sbin:/usr/local/sbin"
+export LC_ALL=C
 
-me="${0}"
+# -----------------------------------------------------------------------------
+
+PROGRAM_NAME="$(basename "${0}")"
+
+logdate() {
+    date "+%Y-%m-%d %H:%M:%S"
+}
+
+log() {
+    local status="${1}"
+    shift
+
+    echo >&2 "$(logdate): ${PROGRAM_NAME}: ${status}: ${*}"
+
+}
+
+warning() {
+    log WARNING "${@}"
+}
+
+error() {
+    log ERROR "${@}"
+}
+
+info() {
+    log INFO "${@}"
+}
+
+fatal() {
+    log FATAL "${@}"
+    exit 1
+}
+
+debug=0
+debug() {
+    [ $debug -eq 1 ] && log DEBUG "${@}"
+}
+
+# -----------------------------------------------------------------------------
+
+# check for BASH v4+ (required for associative arrays)
+[ $(( ${BASH_VERSINFO[0]} )) -lt 4 ] && \
+    fatal "BASH version 4 or later is required (this is ${BASH_VERSION})."
+
+# -----------------------------------------------------------------------------
+# defaults to allow running this script by hand
+
+NETDATA_CONFIG_DIR="${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
 
-recipient="${1}"   # the recepient of the email
-hostname="${2}"    # the hostname this event refers to
+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="${5}"    # the incremental id of the event, for this alarm
-when="${6}"        # the timestamp this event occured
+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 : UNITIALIZED, UNDEFINED, CLEAR, WARNING, CRITICAL
-old_status="${11}" # the previous status: UNITIALIZED, UNDEFINED, CLEAR, WARNING, CRITICAL
-value="${12}"      # the current value
-old_value="${13}"  # the previous value
+status="${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="${15}"   # the duration in seconds the previous state took
-non_clear_duration="${16}" # the total duration in seconds this is non-clear
+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
 
@@ -33,63 +105,218 @@ info="${18}"       # a short description of the alarm
 # don't do anything if this is not WARNING, CRITICAL or CLEAR
 if [ "${status}" != "WARNING" -a "${status}" != "CRITICAL" -a "${status}" != "CLEAR" ]
 then
-    echo >&2 "${me}: not sending notification for ${status} on '${chart}.${name}'"
+    info "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})"
+    info "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_EMAIL="YES"
+SEND_SLACK="YES"
 SEND_PUSHOVER="YES"
+SEND_TELEGRAM="YES"
+SEND_EMAIL="YES"
+SEND_PUSHBULLET="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=()
 
+# pushbullet configs
+PUSHBULLET_ACCESS_TOKEN=
+DEFAULT_RECIPIENT_PUSHBULLET=
+declare -A role_recipients_pushbullet=()
+
+# 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
 
 # -----------------------------------------------------------------------------
-# find the exact recipient per method
+# filter a recipient based on alarm event severity
+
+filter_recipient_by_criticality() {
+    local method="${1}" x="${2}" r s
+    shift
 
-to_email="${role_recipients_email[${recipient}]}"
-[ -z "${to_email}" ] && to_email="${DEFAULT_RECIPIENT_EMAIL}"
-[ -z "${to_email}" ] && to_email="root"
+    r="${x/|*/}" # the recipient
+    s="${x/*|/}" # the severity required for notifying this recipient
 
-to_pushover="${role_recipients_pushover[${recipient}]}"
-[ -z "${to_pushover}" ] && to_pushover="${DEFAULT_RECIPIENT_EMAIL}"
+    # 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_pushbullet=()
+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
+
+    # pushbullet
+    a="${role_recipients_pushbullet[${x}]}"
+    [ -z "${a}" ] && a="${DEFAULT_RECIPIENT_PUSHBULLET}"
+    for r in ${a//,/ }
+    do
+        [ "${r}" != "disabled" ] && filter_recipient_by_criticality pushbullet "${r}" && arr_pushbullet[${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"
 
+# build the list of pushbulet recipients (user tokens)
+to_pushbullet="${!arr_pushbullet[*]}"
+[ -z "${to_pushbullet}" ] && SEND_PUSHBULLET="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"
 
-if [ "${SEND_PUSHOVER}" = "YES" -a -z "${curl}" ]
+# check pushbullet
+[ -z "${DEFAULT_RECIPIENT_PUSHBULLET}" ] && SEND_PUSHBULLET="NO"
+
+# check telegram
+[ -z "${TELEGRAM_BOT_TOKEN}" ] && SEND_TELEGRAM="NO"
+
+if [ \( "${SEND_PUSHOVER}" = "YES" -o "${SEND_SLACK}" = "YES" -o "${SEND_TELEGRAM}" = "YES" -o "${SEND_PUSHBULLET}" = "YES" \) -a -z "${curl}" ]
     then
     curl="$(which curl 2>/dev/null || command -v curl 2>/dev/null)"
-    [ -z "${curl}" ] && SEND_PUSHOVER="NO"
+    if [ -z "${curl}" ]
+        then
+        SEND_PUSHOVER="NO"
+        SEND_PUSHBULLET="NO"
+        SEND_TELEGRAM="NO"
+        SEND_SLACK="NO"
+    fi
 fi
 
 if [ "${SEND_EMAIL}" = "YES" -a -z "${sendmail}" ]
@@ -99,18 +326,17 @@ if [ "${SEND_EMAIL}" = "YES" -a -z "${sendmail}" ]
 fi
 
 # check that we have at least a method enabled
-if [ "${SEND_EMAIL}" != "YES" -a "${SEND_PUSHOVER}" != "YES" ]
+if [ "${SEND_EMAIL}" != "YES" -a "${SEND_PUSHOVER}" != "YES" -a "${SEND_TELEGRAM}" != "YES" -a "${SEND_SLACK}" != "YES" -a "${SEND_PUSHBULLET}" != "YES" ]
     then
-    echo >&2 "I don't have a means to send a notification. Sorry!"
-    exit 1
+    fatal "All notification methods are disabled. Not sending a notification."
 fi
 
 # -----------------------------------------------------------------------------
 # get the system hostname
 
-[ -z "${hostname}" ] && hostname="${NETDATA_HOSTNAME}"
-[ -z "${hostname}" ] && hostname="${NETDATA_REGISTRY_HOSTNAME}"
-[ -z "${hostname}" ] && hostname="$(hostname 2>/dev/null)"
+[ -z "${host}" ] && host="${NETDATA_HOSTNAME}"
+[ -z "${host}" ] && host="${NETDATA_REGISTRY_HOSTNAME}"
+[ -z "${host}" ] && host="$(hostname 2>/dev/null)"
 
 # -----------------------------------------------------------------------------
 # get the date the alarm happened
@@ -118,12 +344,38 @@ fi
 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="${1}" d=0 h=0 m=0 ds="day" hs="hour" ms="minute" ss="second"
+    local s="${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 ))
@@ -138,9 +390,9 @@ duration4human() {
         [ ${h} -gt 1 ] && hs="hours"
         if [ ${h} -gt 0 ]
         then
-            echo "${d} ${ds} and ${h} ${hs}"
+            ret="${d} ${ds} and ${h} ${hs}"
         else
-            echo "${d} ${ds}"
+            ret="${d} ${ds}"
         fi
     elif [ ${h} -gt 0 ]
     then
@@ -149,9 +401,9 @@ duration4human() {
         [ ${m} -gt 1 ] && ms="minutes"
         if [ ${m} -gt 0 ]
         then
-            echo "${h} ${hs} and ${m} ${ms}"
+            ret="${h} ${hs} and ${m} ${ms}"
         else
-            echo "${h} ${hs}"
+            ret="${h} ${hs}"
         fi
     elif [ ${m} -gt 0 ]
     then
@@ -159,31 +411,36 @@ duration4human() {
         [ ${s} -gt 1 ] && ss="seconds"
         if [ ${s} -gt 0 ]
         then
-            echo "${m} ${ms} and ${s} ${ss}"
+            ret="${m} ${ms} and ${s} ${ss}"
         else
-            echo "${m} ${ms}"
+            ret="${m} ${ms}"
         fi
     else
         [ ${s} -gt 1 ] && ss="seconds"
-        echo "${s} ${ss}"
+        ret="${s} ${ss}"
     fi
+
+    REPLY="${ret}"
+    echo "${REPLY}"
 }
 
 # -----------------------------------------------------------------------------
 # email sender
 
 send_email() {
+    local ret=
     if [ "${SEND_EMAIL}" = "YES" ]
         then
 
         "${sendmail}" -t
+        ret=$?
 
-        if [ $? -eq 0 ]
+        if [ $ret -eq 0 ]
         then
-            echo >&2 "${me}: Sent notification email for ${status} on '${chart}.${name}' to '${to_email}'"
+            info "sent email notification for: ${host} ${chart}.${name} is ${status} to '${to_email}'"
             return 0
         else
-            echo >&2 "${me}: FAILED to send notification email for ${status} on '${chart}.${name}' to '${to_email}'"
+            error "failed to send email notification for: ${host} ${chart}.${name} is ${status} to '${to_email}' with error code ${ret}."
             return 1
         fi
     fi
@@ -195,15 +452,21 @@ send_email() {
 # pushover sender
 
 send_pushover() {
-    local apptoken="${1}" usertoken="${2}" when="${3}" url="${4}" status="${5}" title="${6}" message="${7}" httpcode sent=0 user priority
+    local apptoken="${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 "${usertoken}" -a ! -z "${title}" -a ! -z "${message}" ]
+    if [ "${SEND_PUSHOVER}" = "YES" -a ! -z "${apptoken}" -a ! -z "${usertokens}" -a ! -z "${title}" -a ! -z "${message}" ]
         then
 
-        priority=0
-        [ "${status}" = "CRITICAL" ] && priority=1
+        # https://pushover.net/api
+        priority=-2
+        case "${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 ${usertoken//,/ }
+        for user in ${usertokens}
         do
             httpcode=$(${curl} --write-out %{http_code} --silent --output /dev/null \
                 --form-string "token=${apptoken}" \
@@ -219,10 +482,10 @@ send_pushover() {
 
             if [ "${httpcode}" == "200" ]
             then
-                echo >&2 "${me}: Sent notification push for ${status} on '${chart}.${name}' to '${user}'"
+                info "sent pushover notification for: ${host} ${chart}.${name} is ${status} to '${user}'"
                 sent=$((sent + 1))
             else
-                echo >&2 "${me}: FAILED to send notification push for ${status} on '${chart}.${name}' to '${user}' with HTTP error code ${httpcode}."
+                error "failed to send pushover notification for: ${host} ${chart}.${name} is ${status} to '${user}' with HTTP error code ${httpcode}."
             fi
         done
 
@@ -232,21 +495,161 @@ send_pushover() {
     return 1
 }
 
+# -----------------------------------------------------------------------------
+# pushbullet sender
+
+send_pushbullet() {
+    local userapikey="${1}" recipients="${2}" message="${3}" title="${4}" httpcode sent=0 user
+    if [ "${SEND_PUSHBULLET}" = "YES" -a ! -z "${userapikey}" -a ! -z "${recipients}" -a ! -z "${message}" -a ! -z "${title}" ]
+        then
+        #https://docs.pushbullet.com/#create-push
+        for user in ${recipients}
+        do
+            httpcode=$(${curl} --write-out %{http_code} --silent --output /dev/null \
+              --header 'Access-Token: '$userapikey'' \
+              --header 'Content-Type: application/json' \
+              --data-binary  @<(cat <<EOF
+                              {"title": "${title}",
+                              "type": "note",
+                              "email": "${user}",
+                              "body": "$( echo -n ${message})"}
+EOF
+               ) "https://api.pushbullet.com/v2/pushes" -X POST)
+
+            if [ "${httpcode}" == "200" ]
+            then
+                echo >&2 "${me}: Sent pushbullet notification for: ${host} ${chart}.${name} is ${status} to '${user}'"
+                sent=$((sent + 1))
+            else
+                echo >&2 "${me}: Failed to send pushbullet notification for: ${host} ${chart}.${name} is ${status} to '${user}' with HTTP error code ${httpcode}."
+            fi
+        done
+
+        [ ${sent} -gt 0 ] && return 0
+    fi
+
+    return 1
+}
 
 # -----------------------------------------------------------------------------
-# prepare the content of the notification
+# 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
+                info "sent telegram notification for: ${host} ${chart}.${name} is ${status} to '${chatid}'"
+                sent=$((sent + 1))
+            elif [ "${httpcode}" == "401" ]
+            then
+                error "failed to send telegram notification for: ${host} ${chart}.${name} is ${status} to '${chatid}': Wrong bot token."
+            else
+                error "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
+            info "sent slack notification for: ${host} ${chart}.${name} is ${status} to '${channel}'"
+            sent=$((sent + 1))
+        else
+            error "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
+}
 
-# description of the alarm
-[ ! -z "${info}" ] && info=" <small><br/>${info}</small>"
+
+# -----------------------------------------------------------------------------
+# prepare the content of the notification
 
 # the url to send the user on click
-goto_url="${NETDATA_REGISTRY_URL}/goto-host-from-alarm.html?machine_guid=${NETDATA_REGISTRY_UNIQUE_ID}&chart=${chart}&family=${family}"
+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
-raised_for="<br/><small>(was ${old_status,,} for $(duration4human ${duration}))</small>"
+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"
@@ -257,25 +660,31 @@ 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="${name//_/ }"
+               alarm="${name//_/ } ${raised_for}"
                ;;
 esac
 
@@ -284,7 +693,7 @@ then
     severity="Recovered from ${old_status}"
     if [ $non_clear_duration -gt $duration ]
     then
-        raised_for="<br/><small>(had issues for $(duration4human ${non_clear_duration}))</small>"
+        raised_for="(alarm was raised for ${non_clear_duration_txt})"
     fi
 
 elif [ "${old_status}" = "WARNING" -a "${status}" = "CRITICAL" ]
@@ -292,7 +701,7 @@ then
     severity="Escalated to ${status}"
     if [ $non_clear_duration -gt $duration ]
     then
-        raised_for="<br/><small>(has issues for $(duration4human ${non_clear_duration}))</small>"
+        raised_for="(alarm is raised for ${non_clear_duration_txt})"
     fi
 
 elif [ "${old_status}" = "CRITICAL" -a "${status}" = "WARNING" ]
@@ -300,105 +709,143 @@ then
     severity="Demoted to ${status}"
     if [ $non_clear_duration -gt $duration ]
     then
-        raised_for="<br/><small>(has issues for $(duration4human ${non_clear_duration}))</small>"
+        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
+# send the pushover notification
 
-send_pushover "${PUSHOVER_APP_TOKEN}" "${to_pushover}" "${when}" "${goto_url}" "${status}" "${hostname} ${status_message} - ${name//_/ } - ${chart}" "
-<font color=\"${color}\"><b>${alarm}</b></font>${info}<br/>&nbsp;
+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}${raised_for}</b><br/>Time<br/>&nbsp;</small>
+<small><b>${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 pushbullet notification
+
+pushbullet_message="${alarm} \n
+Severity: ${severity} \n
+Chart: ${chart} \n
+Family: ${family} \n
+To View Netdata go to: ${goto_url} \n
+The source of this alarm is line ${src}"
+pushbullet_title="${status} at ${host} ${status_message} - ${name//_/ } - ${chart}}"
+send_pushbullet "${PUSHBULLET_ACCESS_TOKEN}" "${to_pushbullet}" "$pushbullet_message" "$pushbullet_title"
+
+SENT_PUSHBULLET=$?
+
+# -----------------------------------------------------------------------------
+# send the telegram.org message
+
+# https://core.telegram.org/bots/api#formatting-options
+send_telegram "${TELEGRAM_BOT_TOKEN}" "${to_telegram}" "${host} ${status_message} - <b>${name//_/ }</b>
+${chart} (${family})
+<a href=\"${goto_url}\">${alarm}</a>
+<i>${info}</i>"
+
+SENT_TELEGRAM=$?
+
 # -----------------------------------------------------------------------------
 # send the email
 
-cat <<EOF | send_email
+send_email <<EOF
 To: ${to_email}
-Subject: ${hostname} ${status_message} - ${name//_/ } - ${chart}
+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">
+<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">
+        <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 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-weight:400;margin:0">${hostname} ${status_message}</h1>
+                        <td bgcolor="${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} ${status_message}</h1>
                         </td>
                     </tr>
                     <tr>
-                        <td style="vertical-align:top" valign="top">
-                            <div style="margin:0;padding:20px;max-width:700px">
+                        <td style="vertical-align: top;" valign="top">
+                            <div style="margin: 0; padding: 20px; max-width: 700px;">
                                 <table width="100%" cellpadding="0" cellspacing="0" style="max-width:700px">
                                     <tbody>
                                     <tr>
-                                        <td style="font-size:18px;vertical-align:top;margin:0;padding:0 0 20px" align="left" valign="top">
+                                        <td style="font-family: 'Helvetica Neue', 'Helvetica', Helvetica, Arial, sans-serif; font-size: 18px; vertical-align: top; margin: 0; padding:0 0 20px;" align="left" valign="top">
                                             <span>${chart}</span>
-                                            <span style="display:block;color:#666666;font-size:12px;font-weight:300;line-height:1;text-transform:uppercase">Chart</span>
+                                            <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>
+                                    <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-size:18px;vertical-align:top;margin:0;padding:0 0 20px" align="left" valign="top">
+                                        <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>${family}</span>
-                                            <span style="display:block;color:#666666;font-size:12px;font-weight:300;line-height:1;text-transform:uppercase">Family</span>
+                                            <span style="display: block; color: #666666; font-size: 12px; font-weight: 300; line-height: 1; text-transform: uppercase;">Family</span>
                                         </td>
                                     </tr>
-                                    <tr style="margin:0;padding:0">
-                                        <td style="font-size:18px;vertical-align:top;margin:0;padding:0 0 20px" align="left" valign="top">
+                                    <tr style="margin: 0; padding: 0;">
+                                        <td style="font-family: 'Helvetica Neue', 'Helvetica', Helvetica, Arial, sans-serif; font-size: 18px; vertical-align: top; margin: 0; padding: 0 0 20px;" align="left" valign="top">
                                             <span>${severity}</span>
-                                            <span style="display:block;color:#666666;font-size:12px;font-weight:300;line-height:1;text-transform:uppercase">Severity</span>
+                                            <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>
+                                    <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-size:18px;vertical-align:top;margin:0;padding:0 0 20px">
-                                            <a href="${goto_url}" style="font-size:14px;color:#ffffff;text-decoration:none;line-height:1.5;font-weight:bold;text-align:center;display:inline-block;text-transform:capitalize;background:#35568d;border-width:1px;border-style:solid;border-color:#2b4c86;margin:0;padding:10px 15px" target="_blank">View Netdata</a>
+                                    <tr style="margin: 0; padding: 0;">
+                                        <td style="font-family: 'Helvetica Neue', 'Helvetica', Helvetica, Arial, sans-serif; font-size: 18px; vertical-align: top; margin: 0; padding: 0 0 20px;">
+                                            <a href="${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-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>${src}</code>
+                                    <tr style="text-align: center; margin: 0; padding: 0;">
+                                        <td style="font-family: 'Helvetica Neue', 'Helvetica', Helvetica, Arial, sans-serif; font-size: 11px; vertical-align: top; margin: 0; padding: 10px 0 0 0; color: #666666;" align="center" valign="bottom">The source of this alarm is line <code>${src}</code>
                                         </td>
                                     </tr>
-                                    <tr style="text-align:center;margin:0;padding:0">
-                                        <td style="font-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
+                                    <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>
@@ -423,8 +870,8 @@ SENT_EMAIL=$?
 # -----------------------------------------------------------------------------
 # let netdata know
 
-# we did send somehting
-[ ${SENT_EMAIL} -eq 0 -o ${SENT_PUSHOVER} -eq 0 ] && exit 0
+# we did send something
+[ ${SENT_EMAIL} -eq 0 -o ${SENT_PUSHOVER} -eq 0 -o ${SENT_TELEGRAM} -eq 0 -o ${SENT_SLACK} -eq 0 -o ${SENT_PUSHBULLET} -eq 0 ] && exit 0
 
 # we did not send anything
 exit 1