{{- $alert := "CNPGClusterHAWarning" -}}
{{- if not (has $alert .excludeRules) -}}
alert: {{ $alert }}
annotations:
  summary: CNPG Cluster less than 2 standby replicas.
  description: |-
    CloudNativePG Cluster "{{ .labels.job }}" has only {{ .value }} standby replicas, putting
    your cluster at risk if another instance fails. The cluster is still able to operate normally, although
    the `-ro` and `-r` endpoints operate at reduced capacity.

    This can happen during a normal fail-over or automated minor version upgrades. The replaced instance may
    need some time to catch-up with the cluster primary instance.

    This alarm will be constantly triggered if your cluster is configured to run with less than 3 instances.
    In this case you may want to silence it.
  runbook_url: https://github.com/cloudnative-pg/charts/blob/main/charts/cluster/docs/runbooks/CNPGClusterHAWarning.md
expr: |
  max by (job) (cnpg_pg_replication_streaming_replicas{namespace="{{ .namespace }}"} - cnpg_pg_replication_is_wal_receiver_up{namespace="{{ .namespace }}"}) < 2
for: 5m
labels:
  severity: warning
  namespace: {{ .namespace }}
  cnpg_cluster: {{ .cluster }}
{{- end -}}