prometheus-example-app.yaml

apiVersion: v1
kind: Namespace
metadata:
  name: ns1
---
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: prometheus-example-app
  name: prometheus-example-app
  namespace: ns1
spec:
  replicas: 1
  selector:
    matchLabels:
      app: prometheus-example-app
  template:
    metadata:
      labels:
        app: prometheus-example-app
    spec:
      containers:
        - image: quay.io/brancz/prometheus-example-app:v0.1.0
          imagePullPolicy: IfNotPresent
          name: prometheus-example-app
---
apiVersion: v1
kind: Service
metadata:
  labels:
    app: prometheus-example-app
  name: prometheus-example-app
  namespace: ns1
spec:
  ports:
    - port: 8080
      protocol: TCP
      targetPort: 8080
      name: web
  selector:
    app: prometheus-example-app
  type: ClusterIP
---
apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
  labels:
    k8s-app: prometheus-example-monitor
  name: prometheus-example-monitor
  namespace: ns1
spec:
  endpoints:
    - interval: 30s
      port: web
      scheme: http
  selector:
    matchLabels:
      app: prometheus-example-app
---
apiVersion: monitoring.coreos.com/v1
kind: PrometheusRule
metadata:
  name: example-alert
  namespace: ns1
spec:
  groups:
    - name: example
      rules:
        - record: CriticalAlert
          expr: version{job="prometheus-example-app"}
        - alert: CriticalAlert
          expr: version{job="prometheus-example-app"} == 0
          for: 1s
          labels:
            severity: critical