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# Custom
Netdata allows you to send custom notifications, to any endpoint you choose.
To configure custom notifications, you will need to define the `custom_sender()` function in `health_alarm_notify.conf`
You can look at the other senders in `/usr/libexec/netdata/plugins.d/alarm-notify.sh` for examples.
As with other notifications, you will also need to define the recipient list in `DEFAULT_RECIPIENT_CUSTOM` and/or the `role_recipients_custom` array.
Variables available to the custom_sender:
- ${to_custom} the list of recipients for the alarm
- ${host} the host generated this event
- ${url_host} same as ${host} but URL encoded
- ${unique_id} the unique id of this event
- ${alarm_id} the unique id of the alarm that generated this event
- ${event_id} the incremental id of the event, for this alarm id
- ${when} the timestamp this event occurred
- ${name} the name of the alarm, as given in netdata health.d entries
- ${url_name} same as ${name} but URL encoded
- ${chart} the name of the chart (type.id)
- ${url_chart} same as ${chart} but URL encoded
- ${family} the family of the chart
- ${url_family} same as ${family} but URL encoded
- ${status} the current status : REMOVED, UNINITIALIZED, UNDEFINED, CLEAR, WARNING, CRITICAL
- ${old_status} the previous status: REMOVED, UNINITIALIZED, UNDEFINED, CLEAR, WARNING, CRITICAL
- ${value} the current value of the alarm
- ${old_value} the previous value of the alarm
- ${src} the line number and file the alarm has been configured
- ${duration} the duration in seconds of the previous alarm state
- ${duration_txt} same as ${duration} for humans
- ${non_clear_duration} the total duration in seconds this is/was non-clear
- ${non_clear_duration_txt} same as ${non_clear_duration} for humans
- ${units} the units of the value
- ${info} a short description of the alarm
- ${value_string} friendly value (with units)
- ${old_value_string} friendly old value (with units)
- ${image} the URL of an image to represent the status of the alarm
- ${color} a color in #AABBCC format for the alarm
- ${goto_url} the URL the user can click to see the netdata dashboard
- ${calc_expression} the expression evaluated to provide the value for the alarm
- ${calc_param_values} the value of the variables in the evaluated expression
- ${total_warnings} the total number of alarms in WARNING state on the host
- ${total_critical} the total number of alarms in CRITICAL state on the host
The following are more human friendly:
- ${alarm} like "name = value units"
- ${status_message} like "needs attention", "recovered", "is critical"
- ${severity} like "Escalated to CRITICAL", "Recovered from WARNING"
- ${raised_for} like "(alarm was raised for 10 minutes)"
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