docker/prometheus-dcos/prometheus.yml

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global:
  scrape_interval: 15s

scrape_configs:
  - job_name: 'marathon'
    scrape_interval: '15s'
    marathon_sd_configs:
    # set to marathon sever
      - servers: ['http://marathon.mesos:8080']
    relabel_configs:
      # disable all targets which do not have a METRICS_PATH on them
      - source_labels: [__meta_marathon_port_definition_label_METRICS_PATH]
        action: keep
        regex: (.+)

      # assign the value of METRICS_PATH to the prometheus target's metrics path
      - source_labels: [__meta_marathon_port_definition_label_METRICS_PATH]
        action: replace
        target_label: __metrics_path__
        regex: (.+)