GRPC Healthcheck

example.proto

syntax = "proto3";

package example;

message HealthCheckRequest {
  string service = 1;
}

message HealthCheckResponse {
  enum ServingStatus {
    UNKNOWN = 0;
    SERVING = 1;
    NOT_SERVING = 2;
  }
  ServingStatus status = 1;
}

service Example {
  rpc Check(HealthCheckRequest) returns (HealthCheckResponse);
}