syntax = "proto3"; package com.ql.health; message HealthCheckRequest { string service = 1; } message HealthCheckResponse { enum ServingStatus { UNKNOWN = 0; SERVING = 1; NOT_SERVING = 2; SERVICE_UNKNOWN = 3; } ServingStatus status = 1; } service Health { rpc Check(HealthCheckRequest) returns (HealthCheckResponse); rpc Watch(HealthCheckRequest) returns (stream HealthCheckResponse); }