apiVersion: monitoring.coreos.com/v1
kind: PrometheusRule
metadata:
  name: postgres-alerts
  namespace: data
  labels:
    role: alert-rules
spec:
  groups:
    - name: postgres
      rules:
        - alert: PostgresDown
          expr: cnpg_collector_up == 0
          for: 2m
          labels:
            severity: critical
          annotations:
            summary: "PostgreSQL instance is down"
            description: "CNPG collector reports {{ $labels.namespace }}/{{ $labels.pod }} is down."

        - alert: PostgresDatabaseSizeLarge
          expr: cnpg_pg_database_size_bytes > 7e9
          for: 5m
          labels:
            severity: warning
          annotations:
            summary: "PostgreSQL database size is large"
            description: "Database {{ $labels.datname }} is {{ $value | humanize1024 }} (PVC limit 10Gi)"

        - alert: PostgresHighConnections
          expr: sum by (pod) (cnpg_backends_total) > 80
          for: 5m
          labels:
            severity: warning
          annotations:
            summary: "PostgreSQL connection count is high"
            description: "Pod {{ $labels.pod }} has {{ $value }} active connections."