Alertmanager: use global string constant/variable in multiply templates

[Eugene Brusilovsky]

I want to re-use string constant like "KubeDeploymentReplicasMismatch|KubeHpaReplicasMismatch|KubePodNotReady|KubeContainerWaiting" in several Alertmanager template definitions.

let me illustrate by example (I know the below wouldn't work):


{{ $myAlertGroup := "KubeDeploymentReplicasMismatch|KubeHpaReplicasMismatch|KubePodNotReady|KubeContainerWaiting" }}

{{ define "__alert_message_title" -}}

{{ if match .GroupLabels.alertname $myAlertGroup -}}

   {{ .CommonAnnotations.message }}
{{- end }}

{{ define "__alert_message_body" -}}

{{ if match .GroupLabels.alertname $myAlertGroup -}}

      {{- range .Alerts.Firing }}      

      • `{{ .Labels.namespace -}}`/`{{ .Labels.pod -}}`

      {{- end }}

{{- end }}

Is there a way to achieve this?

It's possible to move variable definition inside {{ define .. }} block but then I need to define the same value twice, once per template definition. I want to manage the value in one place.