{{- $Values := (.helm).Values | default .Values }}
{{- $runbookUrl := ($Values.defaultRules).runbookUrl | default "https://runbooks.prometheus-operator.dev/runbooks" }}
{{- $clusterLabel := ($Values.global).clusterLabel | default "cluster" }}
{{- $additionalGroupByLabels := append $Values.defaultRules.additionalGroupByLabels $clusterLabel }}
{{- $groupLabels := join "," $additionalGroupByLabels }}
{{- $grafanaHost := ternary (index (($Values.grafana).ingress).hosts 0) (($Values.external).grafana).host ($Values.grafana).enabled }}
condition: '{{ ($Values.kubeControllerManager).enabled }}'
name: kubernetes-system-controller-manager
rules:
- alert: KubeControllerManagerDown
  annotations:
    description: 'KubeControllerManager has disappeared from Prometheus target discovery.'
    runbook_url: '{{ $runbookUrl }}/kubernetes/kubecontrollermanagerdown'
    summary: 'Target disappeared from Prometheus target discovery.'
  condition: '{{ ($Values.kubeControllerManager).enabled }}'
  expr: absent(up{job="kube-controller-manager"} == 1)
  for: 15m
  labels:
    severity: critical