go/src/google.golang.org/grpc/health/grpc_health_v1/health.proto

syntax = "proto3";

package grpc.health.v1;

message HealthCheckRequest {
  string service = 1;
}

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

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