plugins.d/alarm-notify.sh

   1 #!/usr/bin/env bash
   2
   3 # (C) Costa Tsaousis
   4 # pushover support by Jan Arnold
   5
   6 me="${0}"
   7
   8 # -----------------------------------------------------------------------------
   9 # parse command line parameters
  10
  11 recipient="${1}"   # the recepient of the email
  12 hostname="${2}"    # the hostname this event refers to
  13 unique_id="${3}"   # the unique id of this event
  14 alarm_id="${4}"    # the unique id of the alarm that generated this event
  15 event_id="${5}"    # the incremental id of the event, for this alarm
  16 when="${6}"        # the timestamp this event occured
  17 name="${7}"        # the name of the alarm, as given in netdata health.d entries
  18 chart="${8}"       # the name of the chart (type.id)
  19 family="${9}"      # the family of the chart
  20 status="${10}"     # the current status : UNITIALIZED, UNDEFINED, CLEAR, WARNING, CRITICAL
  21 old_status="${11}" # the previous status: UNITIALIZED, UNDEFINED, CLEAR, WARNING, CRITICAL
  22 value="${12}"      # the current value
  23 old_value="${13}"  # the previous value
  24 src="${14}"        # the line number and file the alarm has been configured
  25 duration="${15}"   # the duration in seconds the previous state took
  26 non_clear_duration="${16}" # the total duration in seconds this is non-clear
  27 units="${17}"      # the units of the value
  28 info="${18}"       # a short description of the alarm
  29
  30 # -----------------------------------------------------------------------------
  31 # screen statuses we don't need to send a notification
  32
  33 # don't do anything if this is not WARNING, CRITICAL or CLEAR
  34 if [ "${status}" != "WARNING" -a "${status}" != "CRITICAL" -a "${status}" != "CLEAR" ]
  35 then
  36     echo >&2 "${me}: not sending notification for ${status} on '${chart}.${name}'"
  37     exit 1
  38 fi
  39
  40 # don't do anything if this is CLEAR, but it was not WARNING or CRITICAL
  41 if [ "${old_status}" != "WARNING" -a "${old_status}" != "CRITICAL" -a "${status}" = "CLEAR" ]
  42 then
  43     echo >&2 "${me}: not sending notification for ${status} on '${chart}.${name}' (last status was ${old_status})"
  44     exit 1
  45 fi
  46
  47 # -----------------------------------------------------------------------------
  48 # load configuration
  49
  50 # needed commands
  51 # if empty they will be searched in the system path
  52 curl=
  53 sendmail=
  54
  55 # enable / disable features
  56 SEND_SLACK="YES"
  57 SEND_PUSHOVER="YES"
  58 SEND_EMAIL="YES"
  59
  60 # slack configs
  61 SLACK_WEBHOOK_URL=
  62 DEFAULT_RECIPIENT_SLACK=
  63 declare -A role_recipients_slack=()
  64
  65 # pushover configs
  66 PUSHOVER_APP_TOKEN=
  67 DEFAULT_RECIPIENT_PUSHOVER=
  68 declare -A role_recipients_pushover=()
  69
  70 # email configs
  71 DEFAULT_RECIPIENT_EMAIL="root"
  72 declare -A role_recipients_email=()
  73
  74 # load the user configuration
  75 # this will overwrite the variables above
  76 if [ -f "${NETDATA_CONFIG_DIR}/health_alarm_notify.conf" ]
  77     then
  78     source "${NETDATA_CONFIG_DIR}/health_alarm_notify.conf"
  79 fi
  80
  81 # -----------------------------------------------------------------------------
  82 # find the exact recipient per method
  83
  84 declare -A arr_slack=()
  85 declare -A arr_pushover=()
  86 declare -A arr_email=()
  87
  88 # netdata may call us with multiple recipients
  89 # so, here we find the unique ones
  90 for x in ${recipient}
  91 do
  92     # email
  93     a="${role_recipients_email[${recipient}]}"
  94     [ -z "${a}" ] && a="${DEFAULT_RECIPIENT_EMAIL}"
  95     for r in ${a//,/ }; do arr_email[${r}]="1"; done
  96
  97     # pushover
  98     a="${role_recipients_pushover[${recipient}]}"
  99     [ -z "${a}" ] && a="${DEFAULT_RECIPIENT_PUSHOVER}"
 100     for r in ${a//,/ }; do arr_pushover[${r}]="1"; done
 101
 102     # slack
 103     a="${role_recipients_slack[${recipient}]}"
 104     [ -z "${a}" ] && a="${DEFAULT_RECIPIENT_SLACK}"
 105     for r in ${a//,/ }; do arr_slack[${r}]="1"; done
 106 done
 107
 108 # build the list of slack recipients (channels)
 109 to_slack="${!arr_slack[*]}"
 110 [ -z "${to_slack}" ] && SEND_SLACK="NO"
 111
 112 # build the list of pushover recipients (user tokens)
 113 to_pushover="${!arr_pushover[*]}"
 114 [ -z "${to_pushover}" ] && SEND_PUSHOVER="NO"
 115
 116 # build the list of email recipients (email addresses)
 117 to_email=
 118 for x in "${!arr_email[*]}"
 119 do
 120     [ ! -z "${to_email}" ] && to_email="${to_email}, "
 121     to_email="${to_email}${x}"
 122 done
 123 [ -z "${to_email}" ] && to_email="root"
 124
 125
 126 # -----------------------------------------------------------------------------
 127 # verify the delivery methods supported
 128
 129 # check slack
 130 [ -z "${SLACK_WEBHOOK_URL}" ] && SEND_SLACK="NO"
 131
 132 # check pushover
 133 [ -z "${PUSHOVER_APP_TOKEN}" ] && SEND_PUSHOVER="NO"
 134
 135 if [ \( "${SEND_PUSHOVER}" = "YES" -o "${SEND_SLACK}" = "YES" \) -a -z "${curl}" ]
 136     then
 137     curl="$(which curl 2>/dev/null || command -v curl 2>/dev/null)"
 138     if [ -z "${curl}" ]
 139         then
 140         SEND_PUSHOVER="NO"
 141         SEND_SLACK="NO"
 142     fi
 143 fi
 144
 145 if [ "${SEND_EMAIL}" = "YES" -a -z "${sendmail}" ]
 146     then
 147     sendmail="$(which sendmail 2>/dev/null || command -v sendmail 2>/dev/null)"
 148     [ -z "${sendmail}" ] && SEND_EMAIL="NO"
 149 fi
 150
 151 # check that we have at least a method enabled
 152 if [ "${SEND_EMAIL}" != "YES" -a "${SEND_PUSHOVER}" != "YES" -a "${SEND_SLACK}" != "YES" ]
 153     then
 154     echo >&2 "I don't have a means to send a notification. Sorry!"
 155     exit 1
 156 fi
 157
 158 # -----------------------------------------------------------------------------
 159 # get the system hostname
 160
 161 [ -z "${hostname}" ] && hostname="${NETDATA_HOSTNAME}"
 162 [ -z "${hostname}" ] && hostname="${NETDATA_REGISTRY_HOSTNAME}"
 163 [ -z "${hostname}" ] && hostname="$(hostname 2>/dev/null)"
 164
 165 # -----------------------------------------------------------------------------
 166 # get the date the alarm happened
 167
 168 date="$(date --date=@${when} 2>/dev/null)"
 169 [ -z "${date}" ] && date="$(date 2>/dev/null)"
 170
 171 # -----------------------------------------------------------------------------
 172 # URL encode a string
 173
 174 urlencode() {
 175     local string="${1}" strlen encoded pos c o
 176
 177     strlen=${#string}
 178     for (( pos=0 ; pos<strlen ; pos++ ))
 179     do
 180         c=${string:$pos:1}
 181         case "$c" in
 182             [-_.~a-zA-Z0-9])
 183                 o="${c}"
 184                 ;;
 185
 186             *)
 187                 printf -v o '%%%02x' "'$c"
 188                 ;;
 189         esac
 190         encoded+="${o}"
 191     done
 192     echo "${encoded}"
 193 }
 194
 195 # -----------------------------------------------------------------------------
 196 # convert a duration in seconds, to a human readable duration
 197 # using DAYS, MINUTES, SECONDS
 198
 199 duration4human() {
 200     local s="${1}" d=0 h=0 m=0 ds="day" hs="hour" ms="minute" ss="second"
 201     d=$(( s / 86400 ))
 202     s=$(( s - (d * 86400) ))
 203     h=$(( s / 3600 ))
 204     s=$(( s - (h * 3600) ))
 205     m=$(( s / 60 ))
 206     s=$(( s - (m * 60) ))
 207
 208     if [ ${d} -gt 0 ]
 209     then
 210         [ ${m} -ge 30 ] && h=$(( h + 1 ))
 211         [ ${d} -gt 1 ] && ds="days"
 212         [ ${h} -gt 1 ] && hs="hours"
 213         if [ ${h} -gt 0 ]
 214         then
 215             echo "${d} ${ds} and ${h} ${hs}"
 216         else
 217             echo "${d} ${ds}"
 218         fi
 219     elif [ ${h} -gt 0 ]
 220     then
 221         [ ${s} -ge 30 ] && m=$(( m + 1 ))
 222         [ ${h} -gt 1 ] && hs="hours"
 223         [ ${m} -gt 1 ] && ms="minutes"
 224         if [ ${m} -gt 0 ]
 225         then
 226             echo "${h} ${hs} and ${m} ${ms}"
 227         else
 228             echo "${h} ${hs}"
 229         fi
 230     elif [ ${m} -gt 0 ]
 231     then
 232         [ ${m} -gt 1 ] && ms="minutes"
 233         [ ${s} -gt 1 ] && ss="seconds"
 234         if [ ${s} -gt 0 ]
 235         then
 236             echo "${m} ${ms} and ${s} ${ss}"
 237         else
 238             echo "${m} ${ms}"
 239         fi
 240     else
 241         [ ${s} -gt 1 ] && ss="seconds"
 242         echo "${s} ${ss}"
 243     fi
 244 }
 245
 246 # -----------------------------------------------------------------------------
 247 # email sender
 248
 249 send_email() {
 250     if [ "${SEND_EMAIL}" = "YES" ]
 251         then
 252
 253         "${sendmail}" -t
 254
 255         if [ $? -eq 0 ]
 256         then
 257             echo >&2 "${me}: Sent notification email for ${status} on '${chart}.${name}' to '${to_email}'"
 258             return 0
 259         else
 260             echo >&2 "${me}: FAILED to send notification email for ${status} on '${chart}.${name}' to '${to_email}'"
 261             return 1
 262         fi
 263     fi
 264
 265     return 1
 266 }
 267
 268 # -----------------------------------------------------------------------------
 269 # pushover sender
 270
 271 send_pushover() {
 272     local apptoken="${1}" usertokens="${2}" when="${3}" url="${4}" status="${5}" title="${6}" message="${7}" httpcode sent=0 user priority
 273
 274     if [ "${SEND_PUSHOVER}" = "YES" -a ! -z "${apptoken}" -a ! -z "${usertokens}" -a ! -z "${title}" -a ! -z "${message}" ]
 275         then
 276
 277         priority=0
 278         [ "${status}" = "CRITICAL" ] && priority=1
 279
 280         for user in ${usertokens}
 281         do
 282             httpcode=$(${curl} --write-out %{http_code} --silent --output /dev/null \
 283                 --form-string "token=${apptoken}" \
 284                 --form-string "user=${user}" \
 285                 --form-string "html=1" \
 286                 --form-string "title=${title}" \
 287                 --form-string "message=${message}" \
 288                 --form-string "timestamp=${when}" \
 289                 --form-string "url=${url}" \
 290                 --form-string "url_title=Open netdata dashboard to view the alarm" \
 291                 --form-string "priority=${priority}" \
 292                 https://api.pushover.net/1/messages.json)
 293
 294             if [ "${httpcode}" == "200" ]
 295             then
 296                 echo >&2 "${me}: Sent pushover notification for: ${host} ${chart}.${name} is ${status} to '${user}'"
 297                 sent=$((sent + 1))
 298             else
 299                 echo >&2 "${me}: Failed to send pushover notification for: ${host} ${chart}.${name} is ${status} to '${user}' with HTTP error code ${httpcode}."
 300             fi
 301         done
 302
 303         [ ${sent} -gt 0 ] && return 0
 304     fi
 305
 306     return 1
 307 }
 308
 309 # -----------------------------------------------------------------------------
 310 # slack sender
 311
 312 send_slack() {
 313     local webhook="${1}" channels="${2}" when="${3}" username="${4}" image="${5}" author="${6}" httpcode sent=0 channel color
 314
 315     if [ "${SEND_SLACK}" = "YES" -a ! -z "${webhook}" -a ! -z "${channels}" -a ! -z "${username}" -a ! -z "${image}" -a ! -z "${author}" ]
 316         then
 317
 318         case "${status}" in
 319             WARNING) color="warning" ;;
 320             CRITICAL) color="danger" ;;
 321             CLEAR) color="good" ;;
 322             *) color="#777777" ;;
 323         esac
 324
 325         for channel in ${channels}
 326         do
 327             httpcode=$(${curl} --write-out %{http_code} --silent --output /dev/null -X POST --data-urlencode \
 328                 "payload={\"channel\": \"#${channel}\", \"username\": \"${username}\", \"text\": \"${hostname} ${status_message} - ${author} ${raised_for} - click <${goto_url}|here> to view the netdata dashboard.\", \"icon_url\": \"${image}\", \"attachments\": [{\"fallback\": \"${alarm} - ${info}\", \"color\": \"${color}\", \"title\": \"${alarm}\", \"title_link\": \"${goto_url}\", \"text\": \"${info}\", \"footer\": \"netdata\", \"footer_icon\": \"${NETDATA_REGISTRY_URL}/images/seo-performance-128.png\", \"ts\": ${when}}]}" \
 329                 "${webhook}")
 330
 331             if [ "${httpcode}" == "200" ]
 332             then
 333                 echo >&2 "${me}: Sent slack notification for: ${host} ${chart}.${name} is ${status} to '${channel}'"
 334                 sent=$((sent + 1))
 335             else
 336                 echo >&2 "${me}: Failed to send slack notification for: ${host} ${chart}.${name} is ${status} to '${channel}', with HTTP error code ${httpcode}."
 337             fi
 338         done
 339
 340         [ ${sent} -gt 0 ] && return 0
 341     fi
 342
 343     return 1
 344 }
 345
 346
 347 # -----------------------------------------------------------------------------
 348 # prepare the content of the notification
 349
 350 # the url to send the user on click
 351 goto_url="${NETDATA_REGISTRY_URL}/goto-host-from-alarm.html?host=$(urlencode "${NETDATA_REGISTRY_HOSTNAME}")&chart=${chart}&family=${family}"
 352
 353 # the severity of the alarm
 354 severity="${status}"
 355
 356 # the time the alarm was raised
 357 raised_for="(was ${old_status,,} for $(duration4human ${duration}))"
 358
 359 # the key status message
 360 status_message="status unknown"
 361
 362 # the color of the alarm
 363 color="grey"
 364
 365 # the alarm value
 366 alarm="${name//_/ } = ${value} ${units}"
 367
 368 # the image of the alarm
 369 image="${NETDATA_REGISTRY_URL}/images/seo-performance-128.png"
 370
 371 # prepare the title based on status
 372 case "${status}" in
 373         CRITICAL)
 374         image="${NETDATA_REGISTRY_URL}/images/alert-128-red.png"
 375         status_message="is critical"
 376         color="#ca414b"
 377         ;;
 378
 379     WARNING)
 380         image="${NETDATA_REGISTRY_URL}/images/alert-128-orange.png"
 381         status_message="needs attention"
 382         color="#caca4b"
 383                 ;;
 384
 385         CLEAR)
 386         image="${NETDATA_REGISTRY_URL}/images/check-mark-2-128-green.png"
 387         status_message="recovered"
 388                 color="#77ca6d"
 389
 390                 # don't show the value when the status is CLEAR
 391                 # for certain alarms, this value might not have any meaning
 392                 alarm="${name//_/ }"
 393                 ;;
 394 esac
 395
 396 if [ "${status}" = "CLEAR" ]
 397 then
 398     severity="Recovered from ${old_status}"
 399     if [ $non_clear_duration -gt $duration ]
 400     then
 401         raised_for="(had issues for $(duration4human ${non_clear_duration}))"
 402     fi
 403
 404 elif [ "${old_status}" = "WARNING" -a "${status}" = "CRITICAL" ]
 405 then
 406     severity="Escalated to ${status}"
 407     if [ $non_clear_duration -gt $duration ]
 408     then
 409         raised_for="(has issues for $(duration4human ${non_clear_duration}))"
 410     fi
 411
 412 elif [ "${old_status}" = "CRITICAL" -a "${status}" = "WARNING" ]
 413 then
 414     severity="Demoted to ${status}"
 415     if [ $non_clear_duration -gt $duration ]
 416     then
 417         raised_for="(has issues for $(duration4human ${non_clear_duration}))"
 418     fi
 419
 420 else
 421     raised_for=
 422 fi
 423
 424 # prepare HTML versions of elements
 425 info_html=
 426 [ ! -z "${info}" ] && info_html=" <small><br/>${info}</small>"
 427
 428 raised_for_html=
 429 [ ! -z "${raised_for}" ] && raised_for_html="<br/><small>${raised_for}</small>"
 430
 431 # -----------------------------------------------------------------------------
 432 # send the slack notification
 433
 434 # slack aggregates posts from the same username
 435 # so we use "${hostname} ${status}" as the bot username, to make them diff
 436
 437 send_slack "${SLACK_WEBHOOK_URL}" "${to_slack}" "${when}" "${hostname} ${status}" "${image}" "${chart} (${family})"
 438 SENT_SLACK=$?
 439
 440 # -----------------------------------------------------------------------------
 441 # send the pushover notification
 442
 443 send_pushover "${PUSHOVER_APP_TOKEN}" "${to_pushover}" "${when}" "${goto_url}" "${status}" "${hostname} ${status_message} - ${name//_/ } - ${chart}" "
 444 <font color=\"${color}\"><b>${alarm}</b></font>${info_html}<br/>&nbsp;
 445 <small><b>${chart}</b><br/>Chart<br/>&nbsp;</small>
 446 <small><b>${family}</b><br/>Family<br/>&nbsp;</small>
 447 <small><b>${severity}</b><br/>Severity<br/>&nbsp;</small>
 448 <small><b>${date}${raised_for_html}</b><br/>Time<br/>&nbsp;</small>
 449 <a href=\"${goto_url}\">View Netdata</a><br/>&nbsp;
 450 <small><small>The source of this alarm is line ${src}</small></small>
 451 "
 452
 453 SENT_PUSHOVER=$?
 454
 455 # -----------------------------------------------------------------------------
 456 # send the email
 457
 458 send_email <<EOF
 459 To: ${to_email}
 460 Subject: ${hostname} ${status_message} - ${name//_/ } - ${chart}
 461 Content-Type: text/html
 462
 463 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 464 <html xmlns="http://www.w3.org/1999/xhtml" style="font-family: 'Helvetica Neue', 'Helvetica', Helvetica, Arial, sans-serif; box-sizing: border-box; font-size: 14px; margin: 0; padding: 0;">
 465 <body style="font-family: 'Helvetica Neue', 'Helvetica', Helvetica, Arial, sans-serif; font-size: 14px; width: 100% !important; min-height: 100%; line-height: 1.6; background: #f6f6f6; margin:0; padding: 0;">
 466 <table>
 467     <tbody>
 468     <tr>
 469         <td style="vertical-align: top;" valign="top"></td>
 470         <td width="700" style="vertical-align: top; display: block !important; max-width: 700px !important; clear: both !important; margin: 0 auto; padding: 0;" valign="top">
 471             <div style="max-width: 700px; display: block; margin: 0 auto; padding: 20px;">
 472                 <table width="100%" cellpadding="0" cellspacing="0" style="background: #fff; border: 1px solid #e9e9e9;">
 473                     <tbody>
 474                     <tr>
 475                         <td bgcolor="#eee" style="padding: 5px 20px 5px 20px; background-color: #eee;">
 476                             <div style="font-family: 'Helvetica Neue', 'Helvetica', Helvetica, Arial, sans-serif; font-size: 20px; color: #777; font-weight: bold;">netdata notification</div>
 477                         </td>
 478                     </tr>
 479                     <tr>
 480                         <td bgcolor="${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: ${color};" align="center" valign="top">
 481                             <h1 style="font-family: 'Helvetica Neue', 'Helvetica', Helvetica, Arial, sans-serif; font-weight: 400; margin: 0;">${hostname} ${status_message}</h1>
 482                         </td>
 483                     </tr>
 484                     <tr>
 485                         <td style="vertical-align: top;" valign="top">
 486                             <div style="margin: 0; padding: 20px; max-width: 700px;">
 487                                 <table width="100%" cellpadding="0" cellspacing="0" style="max-width:700px">
 488                                     <tbody>
 489                                     <tr>
 490                                         <td style="font-family: 'Helvetica Neue', 'Helvetica', Helvetica, Arial, sans-serif; font-size: 18px; vertical-align: top; margin: 0; padding:0 0 20px;" align="left" valign="top">
 491                                             <span>${chart}</span>
 492                                             <span style="display: block; color: #666666; font-size: 12px; font-weight: 300; line-height: 1; text-transform: uppercase;">Chart</span>
 493                                         </td>
 494                                     </tr>
 495                                     <tr style="margin: 0; padding: 0;">
 496                                         <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">
 497                                             <span><b>${alarm}</b>${info_html}</span>
 498                                             <span style="display: block; color: #666666; font-size: 12px; font-weight: 300; line-height: 1; text-transform: uppercase;">Alarm</span>
 499                                         </td>
 500                                     </tr>
 501                                     <tr>
 502                                         <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">
 503                                             <span>${family}</span>
 504                                             <span style="display: block; color: #666666; font-size: 12px; font-weight: 300; line-height: 1; text-transform: uppercase;">Family</span>
 505                                         </td>
 506                                     </tr>
 507                                     <tr style="margin: 0; padding: 0;">
 508                                         <td style="font-family: 'Helvetica Neue', 'Helvetica', Helvetica, Arial, sans-serif; font-size: 18px; vertical-align: top; margin: 0; padding: 0 0 20px;" align="left" valign="top">
 509                                             <span>${severity}</span>
 510                                             <span style="display: block; color: #666666; font-size: 12px; font-weight: 300; line-height: 1; text-transform: uppercase;">Severity</span>
 511                                         </td>
 512                                     </tr>
 513                                     <tr style="margin: 0; padding: 0;">
 514                                         <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>${date}</span>
 515                                             <span>${raised_for_html}</span> <span style="display: block; color: #666666; font-size: 12px; font-weight: 300; line-height: 1; text-transform: uppercase;">Time</span>
 516                                         </td>
 517                                     </tr>
 518                                     <tr style="margin: 0; padding: 0;">
 519                                         <td style="font-family: 'Helvetica Neue', 'Helvetica', Helvetica, Arial, sans-serif; font-size: 18px; vertical-align: top; margin: 0; padding: 0 0 20px;">
 520                                             <a href="${goto_url}" style="font-size: 14px; color: #ffffff; text-decoration: none; line-height: 1.5; font-weight: bold; text-align: center; display: inline-block; text-transform: capitalize; background: #35568d; border-width: 1px; border-style: solid; border-color: #2b4c86; margin: 0; padding: 10px 15px;" target="_blank">View Netdata</a>
 521                                         </td>
 522                                     </tr>
 523                                     <tr style="text-align: center; margin: 0; padding: 0;">
 524                                         <td style="font-family: 'Helvetica Neue', 'Helvetica', Helvetica, Arial, sans-serif; font-size: 11px; vertical-align: top; margin: 0; padding: 10px 0 0 0; color: #666666;" align="center" valign="bottom">The source of this alarm is line <code>${src}</code>
 525                                         </td>
 526                                     </tr>
 527                                     <tr style="text-align: center; margin: 0; padding: 0;">
 528                                         <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
 529                                             <a href="https://mynetdata.io/" target="_blank">netdata</a>, the real-time performance monitoring.
 530                                         </td>
 531                                     </tr>
 532                                     </tbody>
 533                                 </table>
 534                             </div>
 535                         </td>
 536                     </tr>
 537                     </tbody>
 538                 </table>
 539             </div>
 540         </td>
 541     </tr>
 542     </tbody>
 543 </table>
 544 </body>
 545 </html>
 546 EOF
 547
 548 SENT_EMAIL=$?
 549
 550 # -----------------------------------------------------------------------------
 551 # let netdata know
 552
 553 # we did send somehting
 554 [ ${SENT_EMAIL} -eq 0 -o ${SENT_PUSHOVER} -eq 0 -o ${SENT_SLACK} -eq 0 ] && exit 0
 555
 556 # we did not send anything
 557 exit 1