docker/swarm/stack/monitoring/prometheus_relay.yml

parameters:
  docker:
    client:
      stack:
        monitoring:
          network:
            monitoring:
              driver: overlay
              driver_opts:
                encrypted: 1
          service:
            relay:
              networks:
                - monitoring
              deploy:
                replicas: 2
                labels:
                  com.mirantis.monitoring: "relay"
                restart_policy:
                  condition: any
              labels:
                com.mirantis.monitoring: "relay"
              image: ${_param:docker_image_prometheus_relay}
              ports:
                - 15016:8080
              environment:
                PROMETHEUS_RELAY_DNS: 'tasks.monitoring_server'