cherry pick of #10618 to release 3.3#10630

Merged

hexfusion merged 1 commit intoetcd-io:release-3.3from hexfusion:bp_proxy_metrics-3.3

Apr 11, 2019

+129-11

Commits on Apr 11, 2019

*: Change gRPC proxy to expose etcd server endpoint /metrics
hexfusion
committed