apiVersion: apps/v1
kind: Deployment
metadata:
  name: ot-express
spec:
  replicas: 1
  selector:
    matchLabels:
      app: ot-express  
  template:
    metadata:
      labels: # labels to select/identify the deployment
        app: ot-express  
      annotations:
        prometheus.io/scrape: "true"
        prometheus.io/port: "9091"  
    spec:
      containers: 
      - name: ot-express 
        image: ot-express
        imagePullPolicy: Never
        ports:
        - name: express-app
          containerPort: 3000
        - name: express-metrics
          containerPort: 9091
---
apiVersion: v1
kind: Service
metadata:
  name: ot-express
  labels:
    app: ot-express
spec:
  ports:
  - name: express-app
    port: 3000
    targetPort: express-app
  - name: express-metrics
    port: 9091
    targetPort: express-metrics
  selector:
    app: ot-express
  type: NodePort
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: prometheus
rules:
- apiGroups: [""]
  resources:
  - nodes
  - services
  - endpoints
  - pods
  verbs: ["get", "list", "watch"]
- apiGroups: [""]
  resources:
  - configmaps
  verbs: ["get"]
- nonResourceURLs: ["/metrics"]
  verbs: ["get"]
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: prometheus
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: prometheus
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: prometheus
subjects:
- kind: ServiceAccount
  name: prometheus
  namespace: default
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: prometheus-deployment
spec:
  replicas: 1
  selector:
    matchLabels:
      app: prometheus
  template:
    metadata:
      labels:
        app: prometheus
    spec:
      containers:
      - name: prometheus-cont
        image: prom/prometheus
        volumeMounts:
        - name: config-volume
          mountPath: /etc/prometheus/prometheus.yml
          subPath: prom-conf.yml
        ports:
        - containerPort: 9090
      volumes:
      - name: config-volume
        configMap:
          name: prometheus-config
      serviceAccountName: prometheus
---
kind: Service
apiVersion: v1
metadata:
  name: prometheus-service
spec:
  selector:
    app: prometheus
  ports:
  - name: promui
    nodePort: 30900
    protocol: TCP
    port: 9090
    targetPort: 9090
  type: NodePort