Storage Api: Adds traces (#85391)

- adds traces and improved logging to the unified storage server
- add a configurable logger to the gRPC server service

pkg/services/grpcserver/interceptors/logging.go

@@ -0,0 +1,29 @@
+package interceptors
+
+import (
+	"context"
+
+	"github.com/grafana/grafana/pkg/infra/log"
+	"github.com/grafana/grafana/pkg/setting"
+	"google.golang.org/grpc"
+)
+
+func LoggingUnaryInterceptor(cfg *setting.Cfg, logger log.Logger) grpc.UnaryServerInterceptor {
+	return func(
+		ctx context.Context,
+		req any,
+		info *grpc.UnaryServerInfo,
+		handler grpc.UnaryHandler,
+	) (resp any, err error) {
+		resp, err = handler(ctx, req)
+		if cfg.GRPCServerEnableLogging {
+			ctxLogger := logger.FromContext(ctx)
+			if err != nil {
+				ctxLogger.Error("gRPC call", "method", info.FullMethod, "req", req, "err", err)
+			} else {
+				ctxLogger.Info("gRPC call", "method", info.FullMethod, "req", req, "resp", resp)
+			}
+		}
+		return resp, err
+	}
+}

pkg/services/grpcserver/service.go

@@ -73,6 +73,7 @@ func ProvideService(cfg *setting.Cfg, features featuremgmt.FeatureToggles, authe
 			grpc_middleware.ChainUnaryServer(
 				grpcAuth.UnaryServerInterceptor(authenticator.Authenticate),
 				interceptors.TracingUnaryInterceptor(tracer),
+				interceptors.LoggingUnaryInterceptor(s.cfg, s.logger), // needs to be registered after tracing interceptor to get trace id
 				middleware.UnaryServerInstrumentInterceptor(grpcRequestDuration),
 			),
 		),