PetSet + (example) ConfigMap + Governing Service + Client Service for HA Alertmanager

alertmanager-cluster-client-service.yaml

apiVersion: v1
kind: Service
metadata:
  labels:
    app: alertmanager-cluster
  name: alertmanager-cluster-client
spec:
  ports:
  - name: alertmanager-web
    nodePort: 30900
    port: 9093
    protocol: TCP
    targetPort: 9093
  selector:
    app: alertmanager-cluster
  sessionAffinity: None
  type: NodePort

alertmanager-cluster-configmap.yaml

apiVersion: v1
kind: ConfigMap
metadata:
  name: alertmanager
data:
  alertmanager.yaml: |-
    global:
      resolve_timeout: 5m
    route:
      group_by: ['alertname']
      group_wait: 10s
      group_interval: 10s 
      repeat_interval: 1h
      receiver: 'webhook'
    receivers:
    - name: 'webhook'
      webhook_configs:
      - url: 'http://alertmanagerwh:30500/'

alertmanager-cluster-governing-service.yaml

apiVersion: v1
kind: Service
metadata:
  labels:
    app: alertmanager-cluster
  name: alertmanager-cluster
spec:
  clusterIP: None
  ports:
  - name: mesh
    port: 6783
    protocol: TCP
    targetPort: 6783
  selector:
    app: alertmanager-cluster
  sessionAffinity: None
  type: ClusterIP

alertmanager-cluster.yaml

apiVersion: apps/v1alpha1
kind: PetSet
metadata:
  labels:
    app: alertmanager-cluster
  name: alertmanager-cluster
spec:
  replicas: 3
  selector:
    matchLabels:
      app: alertmanager-cluster
  serviceName: alertmanager-cluster
  template:
    metadata:
      annotations:
        pod.alpha.kubernetes.io/initialized: "true"
      creationTimestamp: null
      labels:
        app: alertmanager-cluster
    spec:
      containers:
      - command:
        - /bin/alertmanager
        - -config.file=/etc/prometheus/alertmanager.yaml
        - -web.listen-address=:9093
        - -mesh.listen-address=:6783
        - -storage.path=/tmp/alertmanager-data
        - -mesh.peer=alertmanager-cluster-0.alertmanager-cluster.default.svc
        - -mesh.peer=alertmanager-cluster-1.alertmanager-cluster.default.svc
        - -mesh.peer=alertmanager-cluster-2.alertmanager-cluster.default.svc
        image: quay.io/prometheus/alertmanager:v0.5.0-alpha.0
        imagePullPolicy: IfNotPresent
        name: alertmanager-cluster
        ports:
        - containerPort: 9093
          name: web
          protocol: TCP
        - containerPort: 6783
          name: mesh
          protocol: TCP
        resources: {}
        terminationMessagePath: /dev/termination-log
        volumeMounts:
        - mountPath: /etc/prometheus
          name: config-volume
      dnsPolicy: ClusterFirst
      restartPolicy: Always
      securityContext: {}
      terminationGracePeriodSeconds: 0
      volumes:
      - configMap:
          defaultMode: 420
          name: alertmanager
        name: config-volume