plugins.d/alarm-email.sh

   1 #!/usr/bin/env bash
   2
   3 me="${0}"
   4
   5 sendmail="$(which sendmail 2>/dev/null || command -v sendmail 2>/dev/null)"
   6 if [ -z "${sendmail}" ]
   7 then
   8     echo >&2 "I cannot send emails - there is no sendmail command available."
   9 fi
  10
  11 default_recipient_for_all_roles="root"
  12 declare -A recipients=()
  13 if [ -f "${NETDATA_CONFIG_DIR}/health_email_recipients.conf" ]
  14     then
  15     source "${NETDATA_CONFIG_DIR}/health_email_recipients.conf"
  16 fi
  17
  18 sendmail_from_pipe() {
  19     "${sendmail}" -t
  20
  21     if [ $? -eq 0 ]
  22     then
  23         echo >&2 "${me}: Sent notification email for ${status} on '${chart}.${name}'"
  24         return 0
  25     else
  26         echo >&2 "${me}: FAILED to send notification email for ${status} on '${chart}.${name}'"
  27         return 1
  28     fi
  29 }
  30
  31 recipient="${1}"   # the recepient of the email
  32 hostname="${2}"    # the hostname this event refers to
  33 unique_id="${3}"   # the unique id of this event
  34 alarm_id="${4}"    # the unique id of the alarm that generated this event
  35 event_id="${5}"    # the incremental id of the event, for this alarm
  36 when="${6}"        # the timestamp this event occured
  37 name="${7}"        # the name of the alarm, as given in netdata health.d entries
  38 chart="${8}"       # the name of the chart (type.id)
  39 family="${9}"      # the family of the chart
  40 status="${10}"     # the current status : UNITIALIZED, UNDEFINED, CLEAR, WARNING, CRITICAL
  41 old_status="${11}" # the previous status: UNITIALIZED, UNDEFINED, CLEAR, WARNING, CRITICAL
  42 value="${12}"      # the current value
  43 old_value="${13}"  # the previous value
  44 src="${14}"        # the line number and file the alarm has been configured
  45 duration="${15}"   # the duration in seconds the previous state took
  46 non_clear_duration="${16}" # the total duration in seconds this is non-clear
  47 units="${17}"      # the units of the value
  48 info="${18}"       # a short description of the alarm
  49
  50 to="${recipients[${recipient}]}"
  51 [ -z "${to}" ] && to="${default_recipient_for_all_roles}"
  52 [ -z "${to}" ] && to="root"
  53
  54 [ ! -z "${info}" ] && info=" <small><br/>${info}</small>"
  55
  56 # get the system hostname
  57 [ -z "${hostname}" ] && hostname="${NETDATA_HOSTNAME}"
  58 [ -z "${hostname}" ] && hostname="${NETDATA_REGISTRY_HOSTNAME}"
  59 [ -z "${hostname}" ] && hostname="$(hostname 2>/dev/null)"
  60
  61 goto_url="${NETDATA_REGISTRY_URL}/goto-host-from-alarm.html?machine_guid=${NETDATA_REGISTRY_UNIQUE_ID}&chart=${chart}&family=${family}"
  62
  63 date="$(date --date=@${when} 2>/dev/null)"
  64 [ -z "${date}" ] && date="$(date 2>/dev/null)"
  65
  66 # convert a duration in seconds, to a human readable duration
  67 # using DAYS, MINUTES, SECONDS
  68 duration4human() {
  69     local s="${1}" d=0 h=0 m=0 ds="day" hs="hour" ms="minute" ss="second"
  70     d=$(( s / 86400 ))
  71     s=$(( s - (d * 86400) ))
  72     h=$(( s / 3600 ))
  73     s=$(( s - (h * 3600) ))
  74     m=$(( s / 60 ))
  75     s=$(( s - (m * 60) ))
  76
  77     if [ ${d} -gt 0 ]
  78     then
  79         [ ${m} -ge 30 ] && h=$(( h + 1 ))
  80         [ ${d} -gt 1 ] && ds="days"
  81         [ ${h} -gt 1 ] && hs="hours"
  82         if [ ${h} -gt 0 ]
  83         then
  84             echo "${d} ${ds} and ${h} ${hs}"
  85         else
  86             echo "${d} ${ds}"
  87         fi
  88     elif [ ${h} -gt 0 ]
  89     then
  90         [ ${s} -ge 30 ] && m=$(( m + 1 ))
  91         [ ${h} -gt 1 ] && hs="hours"
  92         [ ${m} -gt 1 ] && ms="minutes"
  93         if [ ${m} -gt 0 ]
  94         then
  95             echo "${h} ${hs} and ${m} ${ms}"
  96         else
  97             echo "${h} ${hs}"
  98         fi
  99     elif [ ${m} -gt 0 ]
 100     then
 101         [ ${m} -gt 1 ] && ms="minutes"
 102         [ ${s} -gt 1 ] && ss="seconds"
 103         if [ ${s} -gt 0 ]
 104         then
 105             echo "${m} ${ms} and ${s} ${ss}"
 106         else
 107             echo "${m} ${ms}"
 108         fi
 109     else
 110         [ ${s} -gt 1 ] && ss="seconds"
 111         echo "${s} ${ss}"
 112     fi
 113 }
 114
 115 severity="${status}"
 116 raised_for="<br/><small>(was ${old_status,,} for $(duration4human ${duration}))</small>"
 117 status_message="status unknown"
 118 color="grey"
 119 alarm="${name} = ${value} ${units}"
 120
 121 # prepare the title based on status
 122 case "${status}" in
 123         CRITICAL)
 124         status_message="is critical"
 125         color="#ca414b"
 126         ;;
 127
 128     WARNING)
 129         status_message="needs attention"
 130         color="#caca4b"
 131                 ;;
 132
 133         CLEAR)
 134         status_message="recovered"
 135                 color="#77ca6d"
 136
 137                 # don't show the value when the status is CLEAR
 138                 # for certain alarms, this value might not have any meaning
 139                 alarm="${name}"
 140                 ;;
 141 esac
 142
 143 if [ "${status}" != "WARNING" -a "${status}" != "CRITICAL" -a "${status}" != "CLEAR" ]
 144 then
 145     # don't do anything if this is not WARNING, CRITICAL or CLEAR
 146     echo >&2 "${me}: not sending notification email for ${status} on '${chart}.${name}'"
 147     exit 0
 148 elif [ "${old_status}" != "WARNING" -a "${old_status}" != "CRITICAL" -a "${status}" = "CLEAR" ]
 149 then
 150     # don't do anything if this is CLEAR, but it was not WARNING or CRITICAL
 151     echo >&2 "${me}: not sending notification email for ${status} on '${chart}.${name}' (last status was ${old_status})"
 152     exit 0
 153 elif [ "${status}" = "CLEAR" ]
 154 then
 155     severity="Recovered from ${old_status}"
 156     if [ $non_clear_duration -gt $duration ]
 157     then
 158         raised_for="<br/><small>(had issues for $(duration4human ${non_clear_duration}))</small>"
 159     fi
 160
 161 elif [ "${old_status}" = "WARNING" -a "${status}" = "CRITICAL" ]
 162 then
 163     severity="Escalated to ${status}"
 164     if [ $non_clear_duration -gt $duration ]
 165     then
 166         raised_for="<br/><small>(has issues for $(duration4human ${non_clear_duration}))</small>"
 167     fi
 168
 169 elif [ "${old_status}" = "CRITICAL" -a "${status}" = "WARNING" ]
 170 then
 171     severity="Demoted to ${status}"
 172     if [ $non_clear_duration -gt $duration ]
 173     then
 174         raised_for="<br/><small>(has issues for $(duration4human ${non_clear_duration}))</small>"
 175     fi
 176
 177 else
 178     raised_for=
 179 fi
 180
 181 # send the email
 182 cat <<EOF | sendmail_from_pipe
 183 To: ${to}
 184 Subject: ${hostname} ${status_message} - ${chart}.${name}
 185 Content-Type: text/html
 186
 187 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 188 <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;">
 189 <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">
 190 <table>
 191     <tbody>
 192     <tr>
 193         <td style="vertical-align:top;" valign="top"></td>
 194         <td width="700" style="vertical-align:top;display:block!important;max-width:700px!important;clear:both!important;margin:0 auto;padding:0" valign="top">
 195             <div style="max-width:700px;display:block;margin:0 auto;padding:20px">
 196                 <table width="100%" cellpadding="0" cellspacing="0"
 197                        style="background:#fff;border:1px solid #e9e9e9">
 198                     <tbody>
 199                     <tr>
 200                         <td bgcolor="#eee"
 201                             style="padding: 5px 20px 5px 20px;background-color:#eee;">
 202                             <div style="font-size:20px;color:#777;font-weight: bold;">netdata notification</div>
 203                         </td>
 204                     </tr>
 205                     <tr>
 206                         <td bgcolor="${color}"
 207                             style="font-size:16px;vertical-align:top;font-weight:400;text-align:center;margin:0;padding:10px;color:#ffffff;background:${color}!important;border:1px solid ${color};border-top-color:${color}" align="center" valign="top">
 208                             <h1 style="font-weight:400;margin:0">${hostname} ${status_message}</h1>
 209                         </td>
 210                     </tr>
 211                     <tr>
 212                         <td style="vertical-align:top" valign="top">
 213                             <div style="margin:0;padding:20px;max-width:700px">
 214                                 <table width="100%" cellpadding="0" cellspacing="0" style="max-width:700px">
 215                                     <tbody>
 216                                     <tr>
 217                                         <td style="font-size:18px;vertical-align:top;margin:0;padding:0 0 20px"
 218                                             align="left" valign="top">
 219                                             <span>${chart}</span>
 220                                             <span style="display:block;color:#666666;font-size:12px;font-weight:300;line-height:1;text-transform:uppercase">Chart</span>
 221                                         </td>
 222                                     </tr>
 223                                     <tr style="margin:0;padding:0">
 224                                         <td style="font-size:18px;vertical-align:top;margin:0;padding:0 0 20px"
 225                                             align="left" valign="top">
 226                                             <span><b>${alarm}</b>${info}</span>
 227                                             <span style="display:block;color:#666666;font-size:12px;font-weight:300;line-height:1;text-transform:uppercase">Alarm</span>
 228                                         </td>
 229                                     </tr>
 230                                     <tr>
 231                                         <td style="font-size:18px;vertical-align:top;margin:0;padding:0 0 20px"
 232                                             align="left" valign="top">
 233                                             <span>${family}</span>
 234                                             <span style="display:block;color:#666666;font-size:12px;font-weight:300;line-height:1;text-transform:uppercase">Family</span>
 235                                         </td>
 236                                     </tr>
 237                                     <tr style="margin:0;padding:0">
 238                                         <td style="font-size:18px;vertical-align:top;margin:0;padding:0 0 20px"
 239                                             align="left" valign="top">
 240                                             <span>${severity}</span>
 241                                             <span style="display:block;color:#666666;font-size:12px;font-weight:300;line-height:1;text-transform:uppercase">Severity</span>
 242                                         </td>
 243                                     </tr>
 244                                     <tr style="margin:0;padding:0">
 245                                         <td style="font-size:18px;vertical-align:top;margin:0;padding:0 0 20px"
 246                                             align="left" valign="top"><span>${date}</span>
 247                                             <span>${raised_for}</span> <span
 248                                                     style="display:block;color:#666666;font-size:12px;font-weight:300;line-height:1;text-transform:uppercase">Time</span>
 249                                         </td>
 250                                     </tr>
 251                                     <!--
 252                                     <tr style="margin:0;padding:0">
 253                                         <td style="font-size:18px;vertical-align:top;margin:0;padding:0 0 20px">
 254                                             <a href="${goto_url}" style="font-size:14px;color:#ffffff;text-decoration:none;line-height:1.5;font-weight:bold;text-align:center;display:inline-block;text-transform:capitalize;background:#35568d;border-width:1px;border-style:solid;border-color:#2b4c86;margin:0;padding:10px 15px" target="_blank">View Netdata</a>
 255                                         </td>
 256                                     </tr>
 257                                     -->
 258                                     <tr style="text-align:center;margin:0;padding:0">
 259                                         <td style="font-size:11px;vertical-align:top;margin:0;padding:10px 0 0 0;color:#666666"
 260                                             align="center" valign="bottom">The source of this alarm is line <code>${src}</code>
 261                                         </td>
 262                                     </tr>
 263                                     <tr style="text-align:center;margin:0;padding:0">
 264                                         <td style="font-size:12px;vertical-align:top;margin:0;padding:20px 0 0 0;color:#666666;border-top:1px solid #f0f0f0"
 265                                             align="center" valign="bottom">Sent by
 266                                             <a href="https://mynetdata.io/" target="_blank">netdata</a>, the real-time performance monitoring.
 267                                         </td>
 268                                     </tr>
 269                                     </tbody>
 270                                 </table>
 271                             </div>
 272                         </td>
 273                     </tr>
 274                     </tbody>
 275                 </table>
 276             </div>
 277         </td>
 278     </tr>
 279     </tbody>
 280 </table>
 281 </body>
 282 </html>
 283 EOF