prometheus_rule.yaml

# Monitor Service (Metrics)
apiVersion: monitoring.coreos.com/v1
kind: PrometheusRule
metadata:
  labels:
    monitoring-key: middleware
    prometheus: application-monitoring
    role: alert-rules
  name: application-monitoring
spec:
  selector:
    matchLabels:
      name: app-metrics-operator
  groups:
    - name: general.rules
      rules:
      - alert: AppMetricsOperatorDown
        expr: absent(up{job="app-metrics-operator"} == 1)
        for: 5m
        labels:
          severity: critical
        annotations:
          description: "The AppMetrics Operator has been down for more than 5 minutes. "
          summary: "The AppMetrics Operator is down. For more information see on the AppMetrics Operator https://github.com/aerogear/app-metrics-operator"
          sop_url: "https://github.com/aerogear/app-metrics-operator/blob/0.1.0/SOP/SOP-operator.adoc"
      - alert: AppMetricsPodcount
        annotations:
          description: "The Pod count for the AppMetrics Server has changed in the last 5 minutes and is lower than the required minimum."
          summary: Pod count for the operator namespace  is {{ printf "%.0f" $value }}. Expected 3 pods at least. For more information see on the AppMetrics Operator https://github.com/aerogear/app-metrics-operator
          sop_url: "https://github.com/aerogear/app-metrics-operator/blob/0.1.0/SOP/SOP-operator.adoc" 
        expr: |
          (1-absent(kube_pod_status_ready{condition="true", namespace="app-metrics"})) or sum(kube_pod_status_ready{condition="true", namespace="app-metrics"}) < 3
        for: 5m
        labels:
          severity: warning