Update ydb/core/mon/mon.cpp

Co-authored-by: Alexey Efimov <xeno@prnwatch.com>

Author: StekPerepolnen

ydb/core/mon/mon.cpp

@@ -1026,7 +1026,7 @@ class THttpMonInitializator : public TActorBootstrapped<THttpMonInitializator> {
 class THttpMonAuthorizedActorRequest : public TActorBootstrapped<THttpMonAuthorizedActorRequest> {
 public:
     NHttp::TEvHttpProxy::TEvHttpIncomingRequest::TPtr Event;
-    TMon::TRegisterHandlerFields& Fields;
+    TMon::TRegisterHandlerFields Fields;
     TMon::TRequestAuthorizer Authorizer;
     NHttp::TEvHttpProxy::TEvSubscribeForCancel::TPtr CancelSubscriber;