code: func Init() {
  	// Register to libkv
  	zookeeper.Register()
  	consul.Register()
  	etcd.Register()
  
  	// Register to internal discovery service
  	discovery.Register("zk", &Discovery{backend: store.ZK})
  	discovery.Register("consul", &Discovery{backend: store.CONSUL})
  	discovery.Register("etcd", &Discovery{backend: store.ETCD})
  }
docs: // Init is exported