apiVersion: v1
kind: ServiceAccount
metadata:
  name: heartbeat
  namespace: kube-system
  labels:
    k8s-app: heartbeat
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: heartbeat
  labels:
    k8s-app: heartbeat
rules:
- apiGroups: [""]
  resources:
  - nodes
  - namespaces
  - pods
  - services
  verbs: ["get", "list", "watch"]
- apiGroups: ["apps"]
  resources:
    - replicasets
  verbs: ["get", "list", "watch"]
- apiGroups: ["batch"]
  resources:
    - jobs
  verbs: ["get", "list", "watch"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  name: heartbeat
  # should be the namespace where heartbeat is running
  namespace: kube-system
  labels:
    k8s-app: heartbeat
rules:
  - apiGroups:
      - coordination.k8s.io
    resources:
      - leases
    verbs: ["get", "create", "update"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  name: heartbeat-kubeadm-config
  namespace: kube-system
  labels:
    k8s-app: heartbeat
rules:
  - apiGroups: [""]
    resources:
      - configmaps
    resourceNames:
      - kubeadm-config
    verbs: ["get"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: heartbeat
subjects:
- kind: ServiceAccount
  name: heartbeat
  namespace: kube-system
roleRef:
  kind: ClusterRole
  name: heartbeat
  apiGroup: rbac.authorization.k8s.io
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: heartbeat
  namespace: kube-system
subjects:
  - kind: ServiceAccount
    name: heartbeat
    namespace: kube-system
roleRef:
  kind: Role
  name: heartbeat
  apiGroup: rbac.authorization.k8s.io
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: heartbeat-kubeadm-config
  namespace: kube-system
subjects:
  - kind: ServiceAccount
    name: heartbeat
    namespace: kube-system
roleRef:
  kind: Role
  name: heartbeat-kubeadm-config
  apiGroup: rbac.authorization.k8s.io
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: heartbeat-deployment-config
  namespace: kube-system
  labels:
    k8s-app: heartbeat
data:
  heartbeat.yml: |-
    #heartbeat.autodiscover: # Enable one or more of the providers below
    #  providers:
    #    - type: kubernetes
    #      resource: pod
    #      scope: cluster
    #      node: ${NODE_NAME}
    #      hints.enabled: true
    #
    #    - type: kubernetes
    #      resource: service
    #      scope: cluster
    #      node: ${NODE_NAME}
    #      hints.enabled: true
    #
    #    - type: kubernetes
    #      resource: node
    #      node: ${NODE_NAME}
    #      scope: cluster
    #      templates:
    #        # Example, check SSH port of all cluster nodes:
    #        - condition: ~
    #          config:
    #            - hosts:
    #                - ${data.host}:22
    #              name: ${data.kubernetes.node.name}
    #              schedule: '@every 10s'
    #              timeout: 5s
    #              type: tcp

    processors:
      - add_cloud_metadata:

    cloud.id: ${ELASTIC_CLOUD_ID}
    cloud.auth: ${ELASTIC_CLOUD_AUTH}

    output.elasticsearch:
      hosts: ['${ELASTICSEARCH_HOST:elasticsearch}:${ELASTICSEARCH_PORT:9200}']
      username: ${ELASTICSEARCH_USERNAME}
      password: ${ELASTICSEARCH_PASSWORD}
---
# Deploy singleton instance in the whole cluster for some unique data sources, like kube-state-metrics
apiVersion: apps/v1
kind: Deployment
metadata:
  name: heartbeat
  namespace: kube-system
  labels:
    k8s-app: heartbeat
spec:
  selector:
    matchLabels:
      k8s-app: heartbeat
  template:
    metadata:
      labels:
        k8s-app: heartbeat
    spec:
      serviceAccountName: heartbeat
      hostNetwork: true
      dnsPolicy: ClusterFirstWithHostNet
      containers:
      - name: heartbeat
        image: docker.elastic.co/beats/heartbeat:8.7.1
        args: [
          "-c", "/etc/heartbeat.yml",
          "-e",
        ]
        env:
        - name: ELASTICSEARCH_HOST
          value: elasticsearch
        - name: ELASTICSEARCH_PORT
          value: "9200"
        - name: ELASTICSEARCH_USERNAME
          value: elastic
        - name: ELASTICSEARCH_PASSWORD
          value: changeme
        - name: ELASTIC_CLOUD_ID
          value:
        - name: ELASTIC_CLOUD_AUTH
          value:
        - name: NODE_NAME
          valueFrom:
            fieldRef:
              fieldPath: spec.nodeName
        securityContext:
          runAsUser: 0
        resources:
          limits:
            memory: 1536Mi
          requests:
            # for synthetics, 2 full cores is a good starting point for relatively consistent perform of a single concurrent check
            # For lightweight checks as low as 100m is fine
            cpu: 2000m 
            # A high value like this is encouraged for browser based monitors. 
            # Lightweight checks use substantially less, even 128Mi is fine for those.
            memory: 1536Mi 
        volumeMounts:
        - name: config
          mountPath: /etc/heartbeat.yml
          readOnly: true
          subPath: heartbeat.yml
        - name: data
          mountPath: /usr/share/heartbeat/data
      volumes:
      - name: config
        configMap:
          defaultMode: 0600
          name: heartbeat-deployment-config
      - name: data
        hostPath:
          path: /var/lib/heartbeat-data
          type: DirectoryOrCreate

---