For Medium

prometheus.yml

      global:
        scrape_interval: 10s
        scrape_timeout: 10s
      scrape_configs:
        - job_name: my-kubernetes-job
          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 "pod", or whatever
            - role: pod
          relabel_configs:
          - source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_slave]
            action: keep
            regex: slaveA
          - source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_path]
            action: replace
            target_label: __metrics_path__
            regex: (.+)
          - source_labels: [__address__, __meta_kubernetes_pod_annotation_prometheus_io_port]
            action: replace
            regex: ([^:]+)(?::\d+)?;(\d+)
            replacement: $1:$2
            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

Used here: https://medium.com/@JoelTakvorian/prometheus-federation-in-kubernetes-4ce46bda834e