Example of a custom template

Here’s an example of how to use a custom template. You can also use the default template included in the setup.

Step 1: Configure a template to render a single alert.

  1. {{ define "myalert" }}
  2.   [{{.Status}}] {{ .Labels.alertname }}
  4.   Labels:
  5.   {{ range .Labels.SortedPairs }}
  6.     {{ .Name }}: {{ .Value }}
  7.   {{ end }}
  9.   {{ if gt (len .Annotations) 0 }}
  10.   Annotations:
  11.   {{ range .Annotations.SortedPairs }}
  12.     {{ .Name }}: {{ .Value }}
  13.   {{ end }}
  14.   {{ end }}
  16.   {{ if gt (len .SilenceURL ) 0 }}
  17.     Silence alert: {{ .SilenceURL }}
  18.   {{ end }}
  19.   {{ if gt (len .DashboardURL ) 0 }}
  20.     Go to dashboard: {{ .DashboardURL }}
  21.   {{ end }}
  22. {{ end }}

Step 2: Configure a template to render entire notification message.

  1. {{ define "mymessage" }}
  2.   {{ if gt (len .Alerts.Firing) 0 }}
  3.     {{ len .Alerts.Firing }} firing:
  4.     {{ range .Alerts.Firing }} {{ template "myalert" .}} {{ end }}
  5.   {{ end }}
  6.   {{ if gt (len .Alerts.Resolved) 0 }}
  7.     {{ len .Alerts.Resolved }} resolved:
  8.     {{ range .Alerts.Resolved }} {{ template "myalert" .}} {{ end }}
  9.   {{ end }}
  10. {{ end }}

Step 3: Add mymessage in the notification message field.

  1. Alert summary:
  2. {{ template "mymessage" . }}