tempo-query: register gRPC health server

Signed-off-by: Benedikt Bongartz <bongartz@klimlive.de>

CHANGELOG.md

@@ -1,5 +1,6 @@
 ## main / unreleased
 
+* [ENHANCEMENT] Register gRPC health server to tempo-query [#4178](https://github.com/grafana/tempo/pull/4178) (@frzifus)
 * [ENHANCEMENT] Send semver version in api/stattus/buildinfo for cloud deployments [#4110](https://github.com/grafana/tempo/pull/4110) [@Aki0x137]
 * [ENHANCEMENT] Speedup tempo-query trace search by allowing parallel queries [#4159](https://github.com/grafana/tempo/pull/4159) (@pavolloffay)
 * [CHANGE] tempo-cli: add support for /api/v2/traces endpoint [#4127](https://github.com/grafana/tempo/pull/4127) (@electron0zero)

cmd/tempo-query/main.go

@@ -15,6 +15,8 @@ import (
 	"go.uber.org/zap/zapcore"
 	google_grpc "google.golang.org/grpc"
 	"google.golang.org/grpc/credentials"
+	"google.golang.org/grpc/health"
+	"google.golang.org/grpc/health/grpc_health_v1"
 
 	"github.com/grafana/tempo/cmd/tempo-query/tempo"
 )
@@ -72,6 +74,10 @@ func main() {
 	storage_v1.RegisterDependenciesReaderPluginServer(srv, backend)
 	storage_v1.RegisterSpanWriterPluginServer(srv, backend)
 
+	healthServer := health.NewServer()
+	grpc_health_v1.RegisterHealthServer(srv, healthServer)
+	healthServer.SetServingStatus("", grpc_health_v1.HealthCheckResponse_SERVING)
+
 	lis, err := net.Listen("tcp", cfg.Address)
 	if err != nil {
 		logger.Error("failed to listen", zap.Error(err))