apiVersion: monitoring.coreos.com/v1
kind: PrometheusRule
metadata:
  labels:
    prometheus: k8s
    role: alert-rules
  name: postgres-operator-alerts
  namespace: monitoring
spec:
  groups:
  - name: postgres-operator
    rules:
    - alert: PatroniHasNoLeader
      expr: (max by (scope) (patroni_master) < 1) and (max by (scope) (patroni_standby_leader) < 1)
      for: 0m
      labels:
        severity: critical
      annotations:
        summary: Patroni has no Leader (instance {{ $labels.instance }})
        description: "A leader node (neither primary nor standby) cannot be found inside the cluster {{ $labels.scope }}\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"