---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRole
metadata:
  name: prometheus
  labels:
    app: prometheus
rules:
  - apiGroups: [""]
    resources:
      - nodes
      - services
      - endpoints
      - pods
      - nodes/proxy
    verbs: ["get", "list", "watch"]
  - apiGroups: [""]
    resources:
      - configmaps
    verbs: ["get"]
  - nonResourceURLs: ["/metrics"]
    verbs: ["get"]
---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRoleBinding
metadata:
  name: prometheus
  labels:
    app: prometheus
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: prometheus
subjects:
  - kind: ServiceAccount
    name: prometheus
    namespace: appmesh-system
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: prometheus
  namespace: appmesh-system
  labels:
    app: prometheus
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: prometheus
  namespace: appmesh-system
  labels:
    app: prometheus
data:
  prometheus.yml: |-
    global:
      scrape_interval: 5s
    scrape_configs:

    # Scrape config for AppMesh Envoy sidecar
    - job_name: 'appmesh-envoy'
      metrics_path: /stats/prometheus
      kubernetes_sd_configs:
      - role: pod

      relabel_configs:
      - source_labels: [__meta_kubernetes_pod_container_name]
        action: keep
        regex: '^envoy$'
      - source_labels: [__address__, __meta_kubernetes_pod_annotation_prometheus_io_port]
        action: replace
        regex: ([^:]+)(?::\d+)?;(\d+)
        replacement: ${1}:9901
        target_label: __address__
      - action: labelmap
        regex: __meta_kubernetes_pod_label_(.+)
      - source_labels: [__meta_kubernetes_namespace]
        action: replace
        target_label: kubernetes_namespace
      - source_labels: [__meta_kubernetes_pod_name]
        action: replace
        target_label: kubernetes_pod_name

      # Exclude high cardinality metrics
      metric_relabel_configs:
      - source_labels: [ cluster_name ]
        regex: '(outbound|inbound|prometheus_stats).*'
        action: drop
      - source_labels: [ tcp_prefix ]
        regex: '(outbound|inbound|prometheus_stats).*'
        action: drop
      - source_labels: [ listener_address ]
        regex: '(.+)'
        action: drop
      - source_labels: [ http_conn_manager_listener_prefix ]
        regex: '(.+)'
        action: drop
      - source_labels: [ http_conn_manager_prefix ]
        regex: '(.+)'
        action: drop
      - source_labels: [ __name__ ]
        regex: 'envoy_tls.*'
        action: drop
      - source_labels: [ __name__ ]
        regex: 'envoy_tcp_downstream.*'
        action: drop
      - source_labels: [ __name__ ]
        regex: 'envoy_http_(stats|admin).*'
        action: drop
      - source_labels: [ __name__ ]
        regex: 'envoy_cluster_(lb|retry|bind|internal|max|original).*'
        action: drop

    # Scrape config for API servers
    - job_name: 'kubernetes-apiservers'
      kubernetes_sd_configs:
      - role: endpoints
        namespaces:
          names:
          - default
      scheme: https
      tls_config:
        ca_file: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt
      bearer_token_file: /var/run/secrets/kubernetes.io/serviceaccount/token
      relabel_configs:
      - source_labels: [__meta_kubernetes_service_name, __meta_kubernetes_endpoint_port_name]
        action: keep
        regex: kubernetes;https

    # Scrape config for nodes
    - job_name: 'kubernetes-nodes'
      scheme: https
      tls_config:
        ca_file: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt
      bearer_token_file: /var/run/secrets/kubernetes.io/serviceaccount/token
      kubernetes_sd_configs:
      - role: node
      relabel_configs:
      - action: labelmap
        regex: __meta_kubernetes_node_label_(.+)
      - target_label: __address__
        replacement: kubernetes.default.svc:443
      - source_labels: [__meta_kubernetes_node_name]
        regex: (.+)
        target_label: __metrics_path__
        replacement: /api/v1/nodes/${1}/proxy/metrics

    # scrape config for cAdvisor
    - job_name: 'kubernetes-cadvisor'
      scheme: https
      tls_config:
        ca_file: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt
      bearer_token_file: /var/run/secrets/kubernetes.io/serviceaccount/token
      kubernetes_sd_configs:
      - role: node
      relabel_configs:
      - action: labelmap
        regex: __meta_kubernetes_node_label_(.+)
      - target_label: __address__
        replacement: kubernetes.default.svc:443
      - source_labels: [__meta_kubernetes_node_name]
        regex: (.+)
        target_label: __metrics_path__
        replacement: /api/v1/nodes/${1}/proxy/metrics/cadvisor

    # scrape config for pods
    - job_name: kubernetes-pods
      kubernetes_sd_configs:
      - role: pod
      relabel_configs:
      - action: keep
        regex: true
        source_labels:
        - __meta_kubernetes_pod_annotation_prometheus_io_scrape
      - source_labels: [ __address__ ]
        regex: '.*9901.*'
        action: drop
      - action: replace
        regex: (.+)
        source_labels:
        - __meta_kubernetes_pod_annotation_prometheus_io_path
        target_label: __metrics_path__
      - action: replace
        regex: ([^:]+)(?::\d+)?;(\d+)
        replacement: $1:$2
        source_labels:
        - __address__
        - __meta_kubernetes_pod_annotation_prometheus_io_port
        target_label: __address__
      - action: labelmap
        regex: __meta_kubernetes_pod_label_(.+)
      - action: replace
        source_labels:
        - __meta_kubernetes_namespace
        target_label: kubernetes_namespace
      - action: replace
        source_labels:
        - __meta_kubernetes_pod_name
        target_label: kubernetes_pod_name
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: prometheus
  namespace: appmesh-system
  labels:
    app: prometheus
spec:
  replicas: 1
  selector:
    matchLabels:
      app: prometheus
  template:
    metadata:
      labels:
        app: prometheus
      annotations:
        version: "appmesh-v1alpha1"
    spec:
      serviceAccountName: prometheus
      containers:
        - name: prometheus
          image: "docker.io/prom/prometheus:v2.7.1"
          imagePullPolicy: IfNotPresent
          args:
            - '--storage.tsdb.retention=6h'
            - '--config.file=/etc/prometheus/prometheus.yml'
          ports:
            - containerPort: 9090
              name: http
          livenessProbe:
            httpGet:
              path: /-/healthy
              port: 9090
          readinessProbe:
            httpGet:
              path: /-/ready
              port: 9090
          resources:
            requests:
              cpu: 10m
              memory: 128Mi
          volumeMounts:
            - name: config-volume
              mountPath: /etc/prometheus
      volumes:
        - name: config-volume
          configMap:
            name: prometheus
---
apiVersion: v1
kind: Service
metadata:
  name: prometheus
  namespace: appmesh-system
  labels:
    name: prometheus
spec:
  selector:
    app: prometheus
  ports:
    - name: http
      protocol: TCP
      port: 9090