Fix BSC VDisk metrics unknown fields exchange

Author: alexvru

ydb/core/blobstorage/vdisk/skeleton/blobstorage_skeleton.cpp

@@ -99,6 +99,7 @@ namespace NKikimr {
             }
             ctx.Send(*SkeletonFrontIDPtr, ev.release());
             // send VDisk's metric to NodeWarden
+            const bool enableThrottlingReport = AppData()->FeatureFlags.GetEnableThrottlingReport();
             ctx.Send(NodeWardenServiceId,
                      new TEvBlobStorage::TEvControllerUpdateDiskStatus(
                          SelfVDiskId,
@@ -109,8 +110,8 @@ namespace NKikimr {
                          state,
                          replicated,
                          outOfSpaceFlags,
-                         OverloadHandler ? OverloadHandler->IsThrottling() : false,
-                         OverloadHandler ? OverloadHandler->GetThrottlingRate() : 0));
+                         enableThrottlingReport ? std::make_optional(OverloadHandler ? OverloadHandler->IsThrottling() : false) : std::nullopt,
+                         enableThrottlingReport ? std::make_optional(OverloadHandler ? OverloadHandler->GetThrottlingRate() : 0) : std::nullopt));
             // repeat later
             ctx.Schedule(Config->WhiteboardUpdateInterval, new TEvTimeToUpdateWhiteboard());
         }

ydb/core/mind/bscontroller/impl.h

@@ -286,6 +286,7 @@ class TBlobStorageController : public TActor<TBlobStorageController>, public TTa
             const ui64 allocatedSizeBefore = Metrics.GetAllocatedSize();
             const ui32 prevStatusFlags = Metrics.GetStatusFlags();
             Metrics.MergeFrom(vDiskMetrics);
+            Metrics.DiscardUnknownFields();
             MetricsDirty = true;
             UpdateVDiskMetrics();
             *allocatedSizeIncrementPtr = Metrics.GetAllocatedSize() - allocatedSizeBefore;

ydb/core/protos/feature_flags.proto

@@ -207,4 +207,5 @@ message TFeatureFlags {
     optional bool EnableEncryptedExport = 181 [default = false];
     optional bool EnableAlterDatabase = 182 [default = false];
     optional bool EnableExportAutoDropping = 183 [default = false];
+    optional bool EnableThrottlingReport = 184 [default = false];
 }