Add tracing capabilities for internode rpc Servers (#6254)

cmd/admin-rpc-server.go

@@ -108,5 +108,5 @@ func registerAdminRPCRouter(router *mux.Router) {
 	rpcServer, err := NewAdminRPCServer()
 	logger.FatalIf(err, "Unable to initialize Lock RPC Server", context.Background())
 	subrouter := router.PathPrefix(minioReservedBucketPath).Subrouter()
-	subrouter.Path(adminServiceSubPath).Handler(rpcServer)
+	subrouter.Path(adminServiceSubPath).HandlerFunc(httpTraceHdrs(rpcServer.ServeHTTP))
 }

cmd/lock-rpc-server.go

@@ -192,5 +192,5 @@ func registerDistNSLockRouter(router *mux.Router) {
 	go startLockMaintenance(globalLockServer)
 
 	subrouter := router.PathPrefix(minioReservedBucketPath).Subrouter()
-	subrouter.Path(lockServiceSubPath).Handler(rpcServer)
+	subrouter.Path(lockServiceSubPath).HandlerFunc(httpTraceHdrs(rpcServer.ServeHTTP))
 }

cmd/peer-rpc-server.go

@@ -203,5 +203,5 @@ func registerPeerRPCRouter(router *mux.Router) {
 	rpcServer, err := NewPeerRPCServer()
 	logger.FatalIf(err, "Unable to initialize peer RPC Server", context.Background())
 	subrouter := router.PathPrefix(minioReservedBucketPath).Subrouter()
-	subrouter.Path(peerServiceSubPath).Handler(rpcServer)
+	subrouter.Path(peerServiceSubPath).HandlerFunc(httpTraceHdrs(rpcServer.ServeHTTP))
 }

cmd/storage-rpc-server.go

@@ -226,7 +226,7 @@ func registerStorageRPCRouters(router *mux.Router, endpoints EndpointList) {
 				logger.Fatal(uiErrUnableToWriteInBackend(err), "Unable to configure one of server's RPC services")
 			}
 			subrouter := router.PathPrefix(minioReservedBucketPath).Subrouter()
-			subrouter.Path(path.Join(storageServiceSubPath, endpoint.Path)).Handler(rpcServer)
+			subrouter.Path(path.Join(storageServiceSubPath, endpoint.Path)).HandlerFunc(httpTraceHdrs(rpcServer.ServeHTTP))
 		}
 	}
 }