Fabric: Health check

# Prometheus
  - ORDERER_OPERATIONS_LISTENADDRESS=0.0.0.0:8008   # operation RESTful API
  - ORDERER_METRICS_PROVIDER=prometheus             # prometheus will pull metrics from orderer via /metrics RESTful API

# StatsD
  - ORDERER_METRICS_PROVIDER=statsd
  - ORDERER_METRICS_STATSD_PREFIX=orderer  # PREFIX来进行区分节点。
  - ORDERER_METRICS_STATSD_ADDRESS=192.168.5.10:8008 # StatsD的地址和端口