prometheus:
  config:
    scrape_configs:
    - job_name: apps
      kubernetes_sd_configs:
      - role: pod
        selectors:
        - role: pod
          # only scrape data from pods running on the same node as collector
          field: "spec.nodeName=${NODE_NAME}"
      relabel_configs:
      # scrape pods annotated with "prometheus.io/scrape: true"
      - source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_scrape]
        regex: "true"
        action: keep
      # read the port from "prometheus.io/port: <port>" annotation and update scraping address accordingly
      - source_labels: [__address__, __meta_kubernetes_pod_annotation_prometheus_io_port]
        action: replace
        target_label: __address__
        regex: ([^:]+)(?::\d+)?;(\d+)
        # escaped $1:$2
        replacement: $$1:$$2
      - source_labels: [__meta_kubernetes_namespace]
        action: replace
        target_label: kubernetes_namespace
      - source_labels: [__meta_kubernetes_pod_name]
        action: replace
        target_label: kubernetes_pod_name