add default rules

charts/postgres-cluster/templates/prometheus-rule.yaml

@@ -27,4 +27,71 @@ spec:
         - {{ $tpl }}
         {{- end -}}
         {{- end -}}
+    {{- if .Values.cluster.monitoring.prometheusRule.enableDefaultRules }}
+    - name: cloudnative-pg/default-rules
+      rules:
+        - alert: LongRunningTransaction
+          annotations:
+            description: Pod {{ $labels.pod }} is taking more than 5 minutes (300 seconds) for a query.
+            summary: A query is taking longer than 5 minutes.
+          expr: |-
+            cnpg_backends_max_tx_duration_seconds > 300
+          for: 1m
+          labels:
+            severity: warning
+        - alert: BackendsWaiting
+          annotations:
+            description: Pod {{ $labels.pod  }} has been waiting for longer than 5 minutes
+            summary: If a backend is waiting for longer than 5 minutes
+          expr: |-
+            cnpg_backends_waiting_total > 300
+          for: 1m
+          labels:
+            severity: warning
+        - alert: PGDatabaseXidAge
+          annotations:
+            description: Over 300,000,000 transactions from frozen xid on pod {{ $labels.pod  }}
+            summary: Number of transactions from the frozen XID to the current one
+          expr: |-
+            cnpg_pg_database_xid_age > 300000000
+          for: 1m
+          labels:
+            severity: warning
+        - alert: PGReplication
+          annotations:
+            description: Standby is lagging behind by over 300 seconds (5 minutes)
+            summary: The standby is lagging behind the primary
+          expr: |-
+            cnpg_pg_replication_lag > 300
+          for: 1m
+          labels:
+            severity: warning
+        - alert: LastFailedArchiveTime
+          annotations:
+            description: Archiving failed for {{ $labels.pod }}
+            summary: Checks the last time archiving failed. Will be < 0 when it has not failed.
+          expr: |-
+            (cnpg_pg_stat_archiver_last_failed_time - cnpg_pg_stat_archiver_last_archived_time) > 1
+          for: 1m
+          labels:
+            severity: warning
+        - alert: DatabaseDeadlockConflicts
+          annotations:
+            description: There are over 10 deadlock conflicts in {{ $labels.pod }}
+            summary: Checks the number of database conflicts
+          expr: |-
+            cnpg_pg_stat_database_deadlocks > 10
+          for: 1m
+          labels:
+            severity: warning
+        - alert: ReplicaFailingReplication
+          annotations:
+            description: Replica {{ $labels.pod }} is failing to replicate
+            summary: Checks if the replica is failing to replicate
+          expr: |-
+            cnpg_pg_replication_in_recovery > cnpg_pg_replication_is_wal_receiver_up
+          for: 1m
+          labels:
+            severity: warning
+    {{- end }}
 {{ end }}