apiVersion: monitoring.coreos.com/v1
kind: PrometheusRule
metadata:
  name: cert-manager
  namespace: cert-manager
  labels:
    app.kubernetes.io/name: cert-manager
    app.kubernetes.io/instance: cert-manager
    app.kubernetes.io/part-of: cert-manager
spec:
  groups:
    - name: EmbeddedExporter
      rules:
        - alert: Cert-ManagerAbsent
          expr: absent(up{job="cert-manager"})
          for: 10m
          labels:
            severity: critical
          annotations:
            summary: Cert-Manager absent (instance {{ $labels.instance }})
            description: "Cert-Manager has disappeared from Prometheus service discovery. New certificates will not be able to be minted, and existing ones can't be renewed until cert-manager is back.\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
        - alert: Cert-ManagerCertificateExpiringSoon
          expr: avg by (exported_namespace, namespace, name) (certmanager_certificate_expiration_timestamp_seconds - time()) < (21 * 24 * 3600)
          for: 1h
          labels:
            severity: warning
          annotations:
            summary: Cert-Manager certificate expiring soon (instance {{ $labels.instance }})
            description: "The certificate {{ $labels.name }} is expiring in less than 21 days.\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
        - alert: Cert-ManagerCertificateNotReady
          expr: max by (name, exported_namespace, namespace, condition) (certmanager_certificate_ready_status{condition!="True"} == 1)
          for: 10m
          labels:
            severity: critical
          annotations:
            summary: Cert-Manager certificate not ready (instance {{ $labels.instance }})
            description: "The certificate {{ $labels.name }} in namespace {{ $labels.exported_namespace }} is not ready to serve traffic.\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
        - alert: Cert-ManagerHittingACMERateLimits
          expr: sum by (host) (rate(certmanager_acme_client_request_count{status="429"}[5m])) > 0
          for: 5m
          labels:
            severity: critical
          annotations:
            summary: Cert-Manager hitting ACME rate limits (instance {{ $labels.instance }})
            description: "Cert-Manager is being rate-limited by the ACME provider. Certificate issuance and renewal may be blocked for up to a week.\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"