parameters:
  prometheus:
    relay:
      backends:
      - host: ${_param:cluster_node01_address}
        port: ${_param:prometheus_server_bind_port}
      - host: ${_param:cluster_node02_address}
        port: ${_param:prometheus_server_bind_port}
      - host: ${_param:cluster_node03_address}
        port: ${_param:prometheus_server_bind_port}