diff --git a/interop/grpc_testing/messages.pb.go b/interop/grpc_testing/messages.pb.go
index e251f17eaea6..0b25d1b0b6b1 100644
--- a/interop/grpc_testing/messages.pb.go
+++ b/interop/grpc_testing/messages.pb.go
@@ -288,7 +288,7 @@ func (x HookRequest_HookRequestCommand) Number() protoreflect.EnumNumber {
 
 // Deprecated: Use HookRequest_HookRequestCommand.Descriptor instead.
 func (HookRequest_HookRequestCommand) EnumDescriptor() ([]byte, []int) {
-	return file_grpc_testing_messages_proto_rawDescGZIP(), []int{20, 0}
+	return file_grpc_testing_messages_proto_rawDescGZIP(), []int{21, 0}
 }
 
 // TODO(dgq): Go back to using well-known types once
@@ -1619,6 +1619,62 @@ func (x *TestOrcaReport) GetUtilization() map[string]float64 {
 	return nil
 }
 
+// Status that will be return to callers of the Hook method
+type SetReturnStatusRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	GrpcCodeToReturn      int32  `protobuf:"varint,1,opt,name=grpc_code_to_return,json=grpcCodeToReturn,proto3" json:"grpc_code_to_return,omitempty"`
+	GrpcStatusDescription string `protobuf:"bytes,2,opt,name=grpc_status_description,json=grpcStatusDescription,proto3" json:"grpc_status_description,omitempty"`
+}
+
+func (x *SetReturnStatusRequest) Reset() {
+	*x = SetReturnStatusRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_grpc_testing_messages_proto_msgTypes[20]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *SetReturnStatusRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*SetReturnStatusRequest) ProtoMessage() {}
+
+func (x *SetReturnStatusRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_grpc_testing_messages_proto_msgTypes[20]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use SetReturnStatusRequest.ProtoReflect.Descriptor instead.
+func (*SetReturnStatusRequest) Descriptor() ([]byte, []int) {
+	return file_grpc_testing_messages_proto_rawDescGZIP(), []int{20}
+}
+
+func (x *SetReturnStatusRequest) GetGrpcCodeToReturn() int32 {
+	if x != nil {
+		return x.GrpcCodeToReturn
+	}
+	return 0
+}
+
+func (x *SetReturnStatusRequest) GetGrpcStatusDescription() string {
+	if x != nil {
+		return x.GrpcStatusDescription
+	}
+	return ""
+}
+
 type HookRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1634,7 +1690,7 @@ type HookRequest struct {
 func (x *HookRequest) Reset() {
 	*x = HookRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_grpc_testing_messages_proto_msgTypes[20]
+		mi := &file_grpc_testing_messages_proto_msgTypes[21]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1647,7 +1703,7 @@ func (x *HookRequest) String() string {
 func (*HookRequest) ProtoMessage() {}
 
 func (x *HookRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_grpc_testing_messages_proto_msgTypes[20]
+	mi := &file_grpc_testing_messages_proto_msgTypes[21]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1660,7 +1716,7 @@ func (x *HookRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use HookRequest.ProtoReflect.Descriptor instead.
 func (*HookRequest) Descriptor() ([]byte, []int) {
-	return file_grpc_testing_messages_proto_rawDescGZIP(), []int{20}
+	return file_grpc_testing_messages_proto_rawDescGZIP(), []int{21}
 }
 
 func (x *HookRequest) GetCommand() HookRequest_HookRequestCommand {
@@ -1700,7 +1756,7 @@ type HookResponse struct {
 func (x *HookResponse) Reset() {
 	*x = HookResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_grpc_testing_messages_proto_msgTypes[21]
+		mi := &file_grpc_testing_messages_proto_msgTypes[22]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1713,7 +1769,7 @@ func (x *HookResponse) String() string {
 func (*HookResponse) ProtoMessage() {}
 
 func (x *HookResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_grpc_testing_messages_proto_msgTypes[21]
+	mi := &file_grpc_testing_messages_proto_msgTypes[22]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1726,7 +1782,7 @@ func (x *HookResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use HookResponse.ProtoReflect.Descriptor instead.
 func (*HookResponse) Descriptor() ([]byte, []int) {
-	return file_grpc_testing_messages_proto_rawDescGZIP(), []int{21}
+	return file_grpc_testing_messages_proto_rawDescGZIP(), []int{22}
 }
 
 type LoadBalancerStatsResponse_MetadataEntry struct {
@@ -1746,7 +1802,7 @@ type LoadBalancerStatsResponse_MetadataEntry struct {
 func (x *LoadBalancerStatsResponse_MetadataEntry) Reset() {
 	*x = LoadBalancerStatsResponse_MetadataEntry{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_grpc_testing_messages_proto_msgTypes[22]
+		mi := &file_grpc_testing_messages_proto_msgTypes[23]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1759,7 +1815,7 @@ func (x *LoadBalancerStatsResponse_MetadataEntry) String() string {
 func (*LoadBalancerStatsResponse_MetadataEntry) ProtoMessage() {}
 
 func (x *LoadBalancerStatsResponse_MetadataEntry) ProtoReflect() protoreflect.Message {
-	mi := &file_grpc_testing_messages_proto_msgTypes[22]
+	mi := &file_grpc_testing_messages_proto_msgTypes[23]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1809,7 +1865,7 @@ type LoadBalancerStatsResponse_RpcMetadata struct {
 func (x *LoadBalancerStatsResponse_RpcMetadata) Reset() {
 	*x = LoadBalancerStatsResponse_RpcMetadata{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_grpc_testing_messages_proto_msgTypes[23]
+		mi := &file_grpc_testing_messages_proto_msgTypes[24]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1822,7 +1878,7 @@ func (x *LoadBalancerStatsResponse_RpcMetadata) String() string {
 func (*LoadBalancerStatsResponse_RpcMetadata) ProtoMessage() {}
 
 func (x *LoadBalancerStatsResponse_RpcMetadata) ProtoReflect() protoreflect.Message {
-	mi := &file_grpc_testing_messages_proto_msgTypes[23]
+	mi := &file_grpc_testing_messages_proto_msgTypes[24]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1857,7 +1913,7 @@ type LoadBalancerStatsResponse_MetadataByPeer struct {
 func (x *LoadBalancerStatsResponse_MetadataByPeer) Reset() {
 	*x = LoadBalancerStatsResponse_MetadataByPeer{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_grpc_testing_messages_proto_msgTypes[24]
+		mi := &file_grpc_testing_messages_proto_msgTypes[25]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1870,7 +1926,7 @@ func (x *LoadBalancerStatsResponse_MetadataByPeer) String() string {
 func (*LoadBalancerStatsResponse_MetadataByPeer) ProtoMessage() {}
 
 func (x *LoadBalancerStatsResponse_MetadataByPeer) ProtoReflect() protoreflect.Message {
-	mi := &file_grpc_testing_messages_proto_msgTypes[24]
+	mi := &file_grpc_testing_messages_proto_msgTypes[25]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1905,7 +1961,7 @@ type LoadBalancerStatsResponse_RpcsByPeer struct {
 func (x *LoadBalancerStatsResponse_RpcsByPeer) Reset() {
 	*x = LoadBalancerStatsResponse_RpcsByPeer{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_grpc_testing_messages_proto_msgTypes[25]
+		mi := &file_grpc_testing_messages_proto_msgTypes[26]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1918,7 +1974,7 @@ func (x *LoadBalancerStatsResponse_RpcsByPeer) String() string {
 func (*LoadBalancerStatsResponse_RpcsByPeer) ProtoMessage() {}
 
 func (x *LoadBalancerStatsResponse_RpcsByPeer) ProtoReflect() protoreflect.Message {
-	mi := &file_grpc_testing_messages_proto_msgTypes[25]
+	mi := &file_grpc_testing_messages_proto_msgTypes[26]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1956,7 +2012,7 @@ type LoadBalancerAccumulatedStatsResponse_MethodStats struct {
 func (x *LoadBalancerAccumulatedStatsResponse_MethodStats) Reset() {
 	*x = LoadBalancerAccumulatedStatsResponse_MethodStats{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_grpc_testing_messages_proto_msgTypes[33]
+		mi := &file_grpc_testing_messages_proto_msgTypes[34]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1969,7 +2025,7 @@ func (x *LoadBalancerAccumulatedStatsResponse_MethodStats) String() string {
 func (*LoadBalancerAccumulatedStatsResponse_MethodStats) ProtoMessage() {}
 
 func (x *LoadBalancerAccumulatedStatsResponse_MethodStats) ProtoReflect() protoreflect.Message {
-	mi := &file_grpc_testing_messages_proto_msgTypes[33]
+	mi := &file_grpc_testing_messages_proto_msgTypes[34]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2013,7 +2069,7 @@ type ClientConfigureRequest_Metadata struct {
 func (x *ClientConfigureRequest_Metadata) Reset() {
 	*x = ClientConfigureRequest_Metadata{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_grpc_testing_messages_proto_msgTypes[36]
+		mi := &file_grpc_testing_messages_proto_msgTypes[37]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2026,7 +2082,7 @@ func (x *ClientConfigureRequest_Metadata) String() string {
 func (*ClientConfigureRequest_Metadata) ProtoMessage() {}
 
 func (x *ClientConfigureRequest_Metadata) ProtoReflect() protoreflect.Message {
-	mi := &file_grpc_testing_messages_proto_msgTypes[36]
+	mi := &file_grpc_testing_messages_proto_msgTypes[37]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2406,38 +2462,46 @@ var file_grpc_testing_messages_proto_rawDesc = []byte{
 	0x69, 0x7a, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x45, 0x6e, 0x74, 0x72, 0x79, 0x12, 0x10, 0x0a, 0x03,
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+	0x0f, 0x0a, 0x0b, 0x55, 0x4e, 0x53, 0x50, 0x45, 0x43, 0x49, 0x46, 0x49, 0x45, 0x44, 0x10, 0x00,
+	0x12, 0x09, 0x0a, 0x05, 0x53, 0x54, 0x41, 0x52, 0x54, 0x10, 0x01, 0x12, 0x08, 0x0a, 0x04, 0x53,
+	0x54, 0x4f, 0x50, 0x10, 0x02, 0x12, 0x0a, 0x0a, 0x06, 0x52, 0x45, 0x54, 0x55, 0x52, 0x4e, 0x10,
+	0x03, 0x22, 0x0e, 0x0a, 0x0c, 0x48, 0x6f, 0x6f, 0x6b, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73,
+	0x65, 0x2a, 0x1f, 0x0a, 0x0b, 0x50, 0x61, 0x79, 0x6c, 0x6f, 0x61, 0x64, 0x54, 0x79, 0x70, 0x65,
+	0x12, 0x10, 0x0a, 0x0c, 0x43, 0x4f, 0x4d, 0x50, 0x52, 0x45, 0x53, 0x53, 0x41, 0x42, 0x4c, 0x45,
+	0x10, 0x00, 0x2a, 0x6f, 0x0a, 0x0f, 0x47, 0x72, 0x70, 0x63, 0x6c, 0x62, 0x52, 0x6f, 0x75, 0x74,
+	0x65, 0x54, 0x79, 0x70, 0x65, 0x12, 0x1d, 0x0a, 0x19, 0x47, 0x52, 0x50, 0x43, 0x4c, 0x42, 0x5f,
+	0x52, 0x4f, 0x55, 0x54, 0x45, 0x5f, 0x54, 0x59, 0x50, 0x45, 0x5f, 0x55, 0x4e, 0x4b, 0x4e, 0x4f,
+	0x57, 0x4e, 0x10, 0x00, 0x12, 0x1e, 0x0a, 0x1a, 0x47, 0x52, 0x50, 0x43, 0x4c, 0x42, 0x5f, 0x52,
+	0x4f, 0x55, 0x54, 0x45, 0x5f, 0x54, 0x59, 0x50, 0x45, 0x5f, 0x46, 0x41, 0x4c, 0x4c, 0x42, 0x41,
+	0x43, 0x4b, 0x10, 0x01, 0x12, 0x1d, 0x0a, 0x19, 0x47, 0x52, 0x50, 0x43, 0x4c, 0x42, 0x5f, 0x52,
+	0x4f, 0x55, 0x54, 0x45, 0x5f, 0x54, 0x59, 0x50, 0x45, 0x5f, 0x42, 0x41, 0x43, 0x4b, 0x45, 0x4e,
+	0x44, 0x10, 0x02, 0x42, 0x1d, 0x0a, 0x1b, 0x69, 0x6f, 0x2e, 0x67, 0x72, 0x70, 0x63, 0x2e, 0x74,
+	0x65, 0x73, 0x74, 0x69, 0x6e, 0x67, 0x2e, 0x69, 0x6e, 0x74, 0x65, 0x67, 0x72, 0x61, 0x74, 0x69,
+	0x6f, 0x6e, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -2453,7 +2517,7 @@ func file_grpc_testing_messages_proto_rawDescGZIP() []byte {
 }
 
 var file_grpc_testing_messages_proto_enumTypes = make([]protoimpl.EnumInfo, 5)
-var file_grpc_testing_messages_proto_msgTypes = make([]protoimpl.MessageInfo, 39)
+var file_grpc_testing_messages_proto_msgTypes = make([]protoimpl.MessageInfo, 40)
 var file_grpc_testing_messages_proto_goTypes = []interface{}{
 	(PayloadType)(0),                                 // 0: grpc.testing.PayloadType
 	(GrpclbRouteType)(0),                             // 1: grpc.testing.GrpclbRouteType
@@ -2480,25 +2544,26 @@ var file_grpc_testing_messages_proto_goTypes = []interface{}{
 	(*ClientConfigureResponse)(nil),                  // 22: grpc.testing.ClientConfigureResponse
 	(*MemorySize)(nil),                               // 23: grpc.testing.MemorySize
 	(*TestOrcaReport)(nil),                           // 24: grpc.testing.TestOrcaReport
-	(*HookRequest)(nil),                              // 25: grpc.testing.HookRequest
-	(*HookResponse)(nil),                             // 26: grpc.testing.HookResponse
-	(*LoadBalancerStatsResponse_MetadataEntry)(nil),  // 27: grpc.testing.LoadBalancerStatsResponse.MetadataEntry
-	(*LoadBalancerStatsResponse_RpcMetadata)(nil),    // 28: grpc.testing.LoadBalancerStatsResponse.RpcMetadata
-	(*LoadBalancerStatsResponse_MetadataByPeer)(nil), // 29: grpc.testing.LoadBalancerStatsResponse.MetadataByPeer
-	(*LoadBalancerStatsResponse_RpcsByPeer)(nil),     // 30: grpc.testing.LoadBalancerStatsResponse.RpcsByPeer
-	nil, // 31: grpc.testing.LoadBalancerStatsResponse.RpcsByPeerEntry
-	nil, // 32: grpc.testing.LoadBalancerStatsResponse.RpcsByMethodEntry
-	nil, // 33: grpc.testing.LoadBalancerStatsResponse.MetadatasByPeerEntry
-	nil, // 34: grpc.testing.LoadBalancerStatsResponse.RpcsByPeer.RpcsByPeerEntry
-	nil, // 35: grpc.testing.LoadBalancerAccumulatedStatsResponse.NumRpcsStartedByMethodEntry
-	nil, // 36: grpc.testing.LoadBalancerAccumulatedStatsResponse.NumRpcsSucceededByMethodEntry
-	nil, // 37: grpc.testing.LoadBalancerAccumulatedStatsResponse.NumRpcsFailedByMethodEntry
-	(*LoadBalancerAccumulatedStatsResponse_MethodStats)(nil), // 38: grpc.testing.LoadBalancerAccumulatedStatsResponse.MethodStats
-	nil,                                     // 39: grpc.testing.LoadBalancerAccumulatedStatsResponse.StatsPerMethodEntry
-	nil,                                     // 40: grpc.testing.LoadBalancerAccumulatedStatsResponse.MethodStats.ResultEntry
-	(*ClientConfigureRequest_Metadata)(nil), // 41: grpc.testing.ClientConfigureRequest.Metadata
-	nil,                                     // 42: grpc.testing.TestOrcaReport.RequestCostEntry
-	nil,                                     // 43: grpc.testing.TestOrcaReport.UtilizationEntry
+	(*SetReturnStatusRequest)(nil),                   // 25: grpc.testing.SetReturnStatusRequest
+	(*HookRequest)(nil),                              // 26: grpc.testing.HookRequest
+	(*HookResponse)(nil),                             // 27: grpc.testing.HookResponse
+	(*LoadBalancerStatsResponse_MetadataEntry)(nil),  // 28: grpc.testing.LoadBalancerStatsResponse.MetadataEntry
+	(*LoadBalancerStatsResponse_RpcMetadata)(nil),    // 29: grpc.testing.LoadBalancerStatsResponse.RpcMetadata
+	(*LoadBalancerStatsResponse_MetadataByPeer)(nil), // 30: grpc.testing.LoadBalancerStatsResponse.MetadataByPeer
+	(*LoadBalancerStatsResponse_RpcsByPeer)(nil),     // 31: grpc.testing.LoadBalancerStatsResponse.RpcsByPeer
+	nil, // 32: grpc.testing.LoadBalancerStatsResponse.RpcsByPeerEntry
+	nil, // 33: grpc.testing.LoadBalancerStatsResponse.RpcsByMethodEntry
+	nil, // 34: grpc.testing.LoadBalancerStatsResponse.MetadatasByPeerEntry
+	nil, // 35: grpc.testing.LoadBalancerStatsResponse.RpcsByPeer.RpcsByPeerEntry
+	nil, // 36: grpc.testing.LoadBalancerAccumulatedStatsResponse.NumRpcsStartedByMethodEntry
+	nil, // 37: grpc.testing.LoadBalancerAccumulatedStatsResponse.NumRpcsSucceededByMethodEntry
+	nil, // 38: grpc.testing.LoadBalancerAccumulatedStatsResponse.NumRpcsFailedByMethodEntry
+	(*LoadBalancerAccumulatedStatsResponse_MethodStats)(nil), // 39: grpc.testing.LoadBalancerAccumulatedStatsResponse.MethodStats
+	nil,                                     // 40: grpc.testing.LoadBalancerAccumulatedStatsResponse.StatsPerMethodEntry
+	nil,                                     // 41: grpc.testing.LoadBalancerAccumulatedStatsResponse.MethodStats.ResultEntry
+	(*ClientConfigureRequest_Metadata)(nil), // 42: grpc.testing.ClientConfigureRequest.Metadata
+	nil,                                     // 43: grpc.testing.TestOrcaReport.RequestCostEntry
+	nil,                                     // 44: grpc.testing.TestOrcaReport.UtilizationEntry
 }
 var file_grpc_testing_messages_proto_depIdxs = []int32{
 	0,  // 0: grpc.testing.Payload.type:type_name -> grpc.testing.PayloadType
@@ -2519,26 +2584,26 @@ var file_grpc_testing_messages_proto_depIdxs = []int32{
 	7,  // 15: grpc.testing.StreamingOutputCallRequest.response_status:type_name -> grpc.testing.EchoStatus
 	24, // 16: grpc.testing.StreamingOutputCallRequest.orca_oob_report:type_name -> grpc.testing.TestOrcaReport
 	6,  // 17: grpc.testing.StreamingOutputCallResponse.payload:type_name -> grpc.testing.Payload
-	31, // 18: grpc.testing.LoadBalancerStatsResponse.rpcs_by_peer:type_name -> grpc.testing.LoadBalancerStatsResponse.RpcsByPeerEntry
-	32, // 19: grpc.testing.LoadBalancerStatsResponse.rpcs_by_method:type_name -> grpc.testing.LoadBalancerStatsResponse.RpcsByMethodEntry
-	33, // 20: grpc.testing.LoadBalancerStatsResponse.metadatas_by_peer:type_name -> grpc.testing.LoadBalancerStatsResponse.MetadatasByPeerEntry
-	35, // 21: grpc.testing.LoadBalancerAccumulatedStatsResponse.num_rpcs_started_by_method:type_name -> grpc.testing.LoadBalancerAccumulatedStatsResponse.NumRpcsStartedByMethodEntry
-	36, // 22: grpc.testing.LoadBalancerAccumulatedStatsResponse.num_rpcs_succeeded_by_method:type_name -> grpc.testing.LoadBalancerAccumulatedStatsResponse.NumRpcsSucceededByMethodEntry
-	37, // 23: grpc.testing.LoadBalancerAccumulatedStatsResponse.num_rpcs_failed_by_method:type_name -> grpc.testing.LoadBalancerAccumulatedStatsResponse.NumRpcsFailedByMethodEntry
-	39, // 24: grpc.testing.LoadBalancerAccumulatedStatsResponse.stats_per_method:type_name -> grpc.testing.LoadBalancerAccumulatedStatsResponse.StatsPerMethodEntry
+	32, // 18: grpc.testing.LoadBalancerStatsResponse.rpcs_by_peer:type_name -> grpc.testing.LoadBalancerStatsResponse.RpcsByPeerEntry
+	33, // 19: grpc.testing.LoadBalancerStatsResponse.rpcs_by_method:type_name -> grpc.testing.LoadBalancerStatsResponse.RpcsByMethodEntry
+	34, // 20: grpc.testing.LoadBalancerStatsResponse.metadatas_by_peer:type_name -> grpc.testing.LoadBalancerStatsResponse.MetadatasByPeerEntry
+	36, // 21: grpc.testing.LoadBalancerAccumulatedStatsResponse.num_rpcs_started_by_method:type_name -> grpc.testing.LoadBalancerAccumulatedStatsResponse.NumRpcsStartedByMethodEntry
+	37, // 22: grpc.testing.LoadBalancerAccumulatedStatsResponse.num_rpcs_succeeded_by_method:type_name -> grpc.testing.LoadBalancerAccumulatedStatsResponse.NumRpcsSucceededByMethodEntry
+	38, // 23: grpc.testing.LoadBalancerAccumulatedStatsResponse.num_rpcs_failed_by_method:type_name -> grpc.testing.LoadBalancerAccumulatedStatsResponse.NumRpcsFailedByMethodEntry
+	40, // 24: grpc.testing.LoadBalancerAccumulatedStatsResponse.stats_per_method:type_name -> grpc.testing.LoadBalancerAccumulatedStatsResponse.StatsPerMethodEntry
 	3,  // 25: grpc.testing.ClientConfigureRequest.types:type_name -> grpc.testing.ClientConfigureRequest.RpcType
-	41, // 26: grpc.testing.ClientConfigureRequest.metadata:type_name -> grpc.testing.ClientConfigureRequest.Metadata
-	42, // 27: grpc.testing.TestOrcaReport.request_cost:type_name -> grpc.testing.TestOrcaReport.RequestCostEntry
-	43, // 28: grpc.testing.TestOrcaReport.utilization:type_name -> grpc.testing.TestOrcaReport.UtilizationEntry
+	42, // 26: grpc.testing.ClientConfigureRequest.metadata:type_name -> grpc.testing.ClientConfigureRequest.Metadata
+	43, // 27: grpc.testing.TestOrcaReport.request_cost:type_name -> grpc.testing.TestOrcaReport.RequestCostEntry
+	44, // 28: grpc.testing.TestOrcaReport.utilization:type_name -> grpc.testing.TestOrcaReport.UtilizationEntry
 	4,  // 29: grpc.testing.HookRequest.command:type_name -> grpc.testing.HookRequest.HookRequestCommand
 	2,  // 30: grpc.testing.LoadBalancerStatsResponse.MetadataEntry.type:type_name -> grpc.testing.LoadBalancerStatsResponse.MetadataType
-	27, // 31: grpc.testing.LoadBalancerStatsResponse.RpcMetadata.metadata:type_name -> grpc.testing.LoadBalancerStatsResponse.MetadataEntry
-	28, // 32: grpc.testing.LoadBalancerStatsResponse.MetadataByPeer.rpc_metadata:type_name -> grpc.testing.LoadBalancerStatsResponse.RpcMetadata
-	34, // 33: grpc.testing.LoadBalancerStatsResponse.RpcsByPeer.rpcs_by_peer:type_name -> grpc.testing.LoadBalancerStatsResponse.RpcsByPeer.RpcsByPeerEntry
-	30, // 34: grpc.testing.LoadBalancerStatsResponse.RpcsByMethodEntry.value:type_name -> grpc.testing.LoadBalancerStatsResponse.RpcsByPeer
-	29, // 35: grpc.testing.LoadBalancerStatsResponse.MetadatasByPeerEntry.value:type_name -> grpc.testing.LoadBalancerStatsResponse.MetadataByPeer
-	40, // 36: grpc.testing.LoadBalancerAccumulatedStatsResponse.MethodStats.result:type_name -> grpc.testing.LoadBalancerAccumulatedStatsResponse.MethodStats.ResultEntry
-	38, // 37: grpc.testing.LoadBalancerAccumulatedStatsResponse.StatsPerMethodEntry.value:type_name -> grpc.testing.LoadBalancerAccumulatedStatsResponse.MethodStats
+	28, // 31: grpc.testing.LoadBalancerStatsResponse.RpcMetadata.metadata:type_name -> grpc.testing.LoadBalancerStatsResponse.MetadataEntry
+	29, // 32: grpc.testing.LoadBalancerStatsResponse.MetadataByPeer.rpc_metadata:type_name -> grpc.testing.LoadBalancerStatsResponse.RpcMetadata
+	35, // 33: grpc.testing.LoadBalancerStatsResponse.RpcsByPeer.rpcs_by_peer:type_name -> grpc.testing.LoadBalancerStatsResponse.RpcsByPeer.RpcsByPeerEntry
+	31, // 34: grpc.testing.LoadBalancerStatsResponse.RpcsByMethodEntry.value:type_name -> grpc.testing.LoadBalancerStatsResponse.RpcsByPeer
+	30, // 35: grpc.testing.LoadBalancerStatsResponse.MetadatasByPeerEntry.value:type_name -> grpc.testing.LoadBalancerStatsResponse.MetadataByPeer
+	41, // 36: grpc.testing.LoadBalancerAccumulatedStatsResponse.MethodStats.result:type_name -> grpc.testing.LoadBalancerAccumulatedStatsResponse.MethodStats.ResultEntry
+	39, // 37: grpc.testing.LoadBalancerAccumulatedStatsResponse.StatsPerMethodEntry.value:type_name -> grpc.testing.LoadBalancerAccumulatedStatsResponse.MethodStats
 	3,  // 38: grpc.testing.ClientConfigureRequest.Metadata.type:type_name -> grpc.testing.ClientConfigureRequest.RpcType
 	39, // [39:39] is the sub-list for method output_type
 	39, // [39:39] is the sub-list for method input_type
@@ -2794,7 +2859,7 @@ func file_grpc_testing_messages_proto_init() {
 			}
 		}
 		file_grpc_testing_messages_proto_msgTypes[20].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*HookRequest); i {
+			switch v := v.(*SetReturnStatusRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2806,7 +2871,7 @@ func file_grpc_testing_messages_proto_init() {
 			}
 		}
 		file_grpc_testing_messages_proto_msgTypes[21].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*HookResponse); i {
+			switch v := v.(*HookRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2818,7 +2883,7 @@ func file_grpc_testing_messages_proto_init() {
 			}
 		}
 		file_grpc_testing_messages_proto_msgTypes[22].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*LoadBalancerStatsResponse_MetadataEntry); i {
+			switch v := v.(*HookResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2830,7 +2895,7 @@ func file_grpc_testing_messages_proto_init() {
 			}
 		}
 		file_grpc_testing_messages_proto_msgTypes[23].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*LoadBalancerStatsResponse_RpcMetadata); i {
+			switch v := v.(*LoadBalancerStatsResponse_MetadataEntry); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2842,7 +2907,7 @@ func file_grpc_testing_messages_proto_init() {
 			}
 		}
 		file_grpc_testing_messages_proto_msgTypes[24].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*LoadBalancerStatsResponse_MetadataByPeer); i {
+			switch v := v.(*LoadBalancerStatsResponse_RpcMetadata); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2854,6 +2919,18 @@ func file_grpc_testing_messages_proto_init() {
 			}
 		}
 		file_grpc_testing_messages_proto_msgTypes[25].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*LoadBalancerStatsResponse_MetadataByPeer); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_grpc_testing_messages_proto_msgTypes[26].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*LoadBalancerStatsResponse_RpcsByPeer); i {
 			case 0:
 				return &v.state
@@ -2865,7 +2942,7 @@ func file_grpc_testing_messages_proto_init() {
 				return nil
 			}
 		}
-		file_grpc_testing_messages_proto_msgTypes[33].Exporter = func(v interface{}, i int) interface{} {
+		file_grpc_testing_messages_proto_msgTypes[34].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*LoadBalancerAccumulatedStatsResponse_MethodStats); i {
 			case 0:
 				return &v.state
@@ -2877,7 +2954,7 @@ func file_grpc_testing_messages_proto_init() {
 				return nil
 			}
 		}
-		file_grpc_testing_messages_proto_msgTypes[36].Exporter = func(v interface{}, i int) interface{} {
+		file_grpc_testing_messages_proto_msgTypes[37].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*ClientConfigureRequest_Metadata); i {
 			case 0:
 				return &v.state
@@ -2896,7 +2973,7 @@ func file_grpc_testing_messages_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_grpc_testing_messages_proto_rawDesc,
 			NumEnums:      5,
-			NumMessages:   39,
+			NumMessages:   40,
 			NumExtensions: 0,
 			NumServices:   0,
 		},
diff --git a/interop/grpc_testing/test.pb.go b/interop/grpc_testing/test.pb.go
index 58305cd3fcc3..a48378177c53 100644
--- a/interop/grpc_testing/test.pb.go
+++ b/interop/grpc_testing/test.pb.go
@@ -120,35 +120,44 @@ var file_grpc_testing_test_proto_rawDesc = []byte{
 	0x73, 0x74, 0x1a, 0x32, 0x2e, 0x67, 0x72, 0x70, 0x63, 0x2e, 0x74, 0x65, 0x73, 0x74, 0x69, 0x6e,
 	0x67, 0x2e, 0x4c, 0x6f, 0x61, 0x64, 0x42, 0x61, 0x6c, 0x61, 0x6e, 0x63, 0x65, 0x72, 0x41, 0x63,
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-	0x53, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x12, 0x30, 0x0a, 0x04, 0x48, 0x6f, 0x6f, 0x6b, 0x12,
-	0x13, 0x2e, 0x67, 0x72, 0x70, 0x63, 0x2e, 0x74, 0x65, 0x73, 0x74, 0x69, 0x6e, 0x67, 0x2e, 0x45,
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 	0x67, 0x72, 0x70, 0x63, 0x2e, 0x74, 0x65, 0x73, 0x74, 0x69, 0x6e, 0x67, 0x2e, 0x45, 0x6d, 0x70,
 	0x74, 0x79, 0x1a, 0x13, 0x2e, 0x67, 0x72, 0x70, 0x63, 0x2e, 0x74, 0x65, 0x73, 0x74, 0x69, 0x6e,
-	0x67, 0x2e, 0x45, 0x6d, 0x70, 0x74, 0x79, 0x12, 0x48, 0x0a, 0x0f, 0x53, 0x65, 0x6e, 0x64, 0x48,
-	0x6f, 0x6f, 0x6b, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x12, 0x19, 0x2e, 0x67, 0x72, 0x70,
-	0x63, 0x2e, 0x74, 0x65, 0x73, 0x74, 0x69, 0x6e, 0x67, 0x2e, 0x48, 0x6f, 0x6f, 0x6b, 0x52, 0x65,
-	0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x1a, 0x2e, 0x67, 0x72, 0x70, 0x63, 0x2e, 0x74, 0x65, 0x73,
-	0x74, 0x69, 0x6e, 0x67, 0x2e, 0x48, 0x6f, 0x6f, 0x6b, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73,
-	0x65, 0x32, 0x7b, 0x0a, 0x1f, 0x58, 0x64, 0x73, 0x55, 0x70, 0x64, 0x61, 0x74, 0x65, 0x43, 0x6c,
-	0x69, 0x65, 0x6e, 0x74, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x75, 0x72, 0x65, 0x53, 0x65, 0x72,
-	0x76, 0x69, 0x63, 0x65, 0x12, 0x58, 0x0a, 0x09, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x75, 0x72,
-	0x65, 0x12, 0x24, 0x2e, 0x67, 0x72, 0x70, 0x63, 0x2e, 0x74, 0x65, 0x73, 0x74, 0x69, 0x6e, 0x67,
-	0x2e, 0x43, 0x6c, 0x69, 0x65, 0x6e, 0x74, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x75, 0x72, 0x65,
-	0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x25, 0x2e, 0x67, 0x72, 0x70, 0x63, 0x2e, 0x74,
-	0x65, 0x73, 0x74, 0x69, 0x6e, 0x67, 0x2e, 0x43, 0x6c, 0x69, 0x65, 0x6e, 0x74, 0x43, 0x6f, 0x6e,
-	0x66, 0x69, 0x67, 0x75, 0x72, 0x65, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x42, 0x1d,
-	0x0a, 0x1b, 0x69, 0x6f, 0x2e, 0x67, 0x72, 0x70, 0x63, 0x2e, 0x74, 0x65, 0x73, 0x74, 0x69, 0x6e,
-	0x67, 0x2e, 0x69, 0x6e, 0x74, 0x65, 0x67, 0x72, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x62, 0x06, 0x70,
-	0x72, 0x6f, 0x74, 0x6f, 0x33,
+	0x67, 0x2e, 0x45, 0x6d, 0x70, 0x74, 0x79, 0x32, 0xd5, 0x01, 0x0a, 0x16, 0x58, 0x64, 0x73, 0x55,
+	0x70, 0x64, 0x61, 0x74, 0x65, 0x48, 0x65, 0x61, 0x6c, 0x74, 0x68, 0x53, 0x65, 0x72, 0x76, 0x69,
+	0x63, 0x65, 0x12, 0x36, 0x0a, 0x0a, 0x53, 0x65, 0x74, 0x53, 0x65, 0x72, 0x76, 0x69, 0x6e, 0x67,
+	0x12, 0x13, 0x2e, 0x67, 0x72, 0x70, 0x63, 0x2e, 0x74, 0x65, 0x73, 0x74, 0x69, 0x6e, 0x67, 0x2e,
+	0x45, 0x6d, 0x70, 0x74, 0x79, 0x1a, 0x13, 0x2e, 0x67, 0x72, 0x70, 0x63, 0x2e, 0x74, 0x65, 0x73,
+	0x74, 0x69, 0x6e, 0x67, 0x2e, 0x45, 0x6d, 0x70, 0x74, 0x79, 0x12, 0x39, 0x0a, 0x0d, 0x53, 0x65,
+	0x74, 0x4e, 0x6f, 0x74, 0x53, 0x65, 0x72, 0x76, 0x69, 0x6e, 0x67, 0x12, 0x13, 0x2e, 0x67, 0x72,
+	0x70, 0x63, 0x2e, 0x74, 0x65, 0x73, 0x74, 0x69, 0x6e, 0x67, 0x2e, 0x45, 0x6d, 0x70, 0x74, 0x79,
+	0x1a, 0x13, 0x2e, 0x67, 0x72, 0x70, 0x63, 0x2e, 0x74, 0x65, 0x73, 0x74, 0x69, 0x6e, 0x67, 0x2e,
+	0x45, 0x6d, 0x70, 0x74, 0x79, 0x12, 0x48, 0x0a, 0x0f, 0x53, 0x65, 0x6e, 0x64, 0x48, 0x6f, 0x6f,
+	0x6b, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x12, 0x19, 0x2e, 0x67, 0x72, 0x70, 0x63, 0x2e,
+	0x74, 0x65, 0x73, 0x74, 0x69, 0x6e, 0x67, 0x2e, 0x48, 0x6f, 0x6f, 0x6b, 0x52, 0x65, 0x71, 0x75,
+	0x65, 0x73, 0x74, 0x1a, 0x1a, 0x2e, 0x67, 0x72, 0x70, 0x63, 0x2e, 0x74, 0x65, 0x73, 0x74, 0x69,
+	0x6e, 0x67, 0x2e, 0x48, 0x6f, 0x6f, 0x6b, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x32,
+	0x7b, 0x0a, 0x1f, 0x58, 0x64, 0x73, 0x55, 0x70, 0x64, 0x61, 0x74, 0x65, 0x43, 0x6c, 0x69, 0x65,
+	0x6e, 0x74, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x75, 0x72, 0x65, 0x53, 0x65, 0x72, 0x76, 0x69,
+	0x63, 0x65, 0x12, 0x58, 0x0a, 0x09, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x75, 0x72, 0x65, 0x12,
+	0x24, 0x2e, 0x67, 0x72, 0x70, 0x63, 0x2e, 0x74, 0x65, 0x73, 0x74, 0x69, 0x6e, 0x67, 0x2e, 0x43,
+	0x6c, 0x69, 0x65, 0x6e, 0x74, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x75, 0x72, 0x65, 0x52, 0x65,
+	0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x25, 0x2e, 0x67, 0x72, 0x70, 0x63, 0x2e, 0x74, 0x65, 0x73,
+	0x74, 0x69, 0x6e, 0x67, 0x2e, 0x43, 0x6c, 0x69, 0x65, 0x6e, 0x74, 0x43, 0x6f, 0x6e, 0x66, 0x69,
+	0x67, 0x75, 0x72, 0x65, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x42, 0x1d, 0x0a, 0x1b,
+	0x69, 0x6f, 0x2e, 0x67, 0x72, 0x70, 0x63, 0x2e, 0x74, 0x65, 0x73, 0x74, 0x69, 0x6e, 0x67, 0x2e,
+	0x69, 0x6e, 0x74, 0x65, 0x67, 0x72, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x62, 0x06, 0x70, 0x72, 0x6f,
+	0x74, 0x6f, 0x33,
 }
 
 var file_grpc_testing_test_proto_goTypes = []interface{}{
@@ -159,16 +168,17 @@ var file_grpc_testing_test_proto_goTypes = []interface{}{
 	(*ReconnectParams)(nil),                      // 4: grpc.testing.ReconnectParams
 	(*LoadBalancerStatsRequest)(nil),             // 5: grpc.testing.LoadBalancerStatsRequest
 	(*LoadBalancerAccumulatedStatsRequest)(nil),  // 6: grpc.testing.LoadBalancerAccumulatedStatsRequest
-	(*HookRequest)(nil),                          // 7: grpc.testing.HookRequest
-	(*ClientConfigureRequest)(nil),               // 8: grpc.testing.ClientConfigureRequest
-	(*SimpleResponse)(nil),                       // 9: grpc.testing.SimpleResponse
-	(*StreamingOutputCallResponse)(nil),          // 10: grpc.testing.StreamingOutputCallResponse
-	(*StreamingInputCallResponse)(nil),           // 11: grpc.testing.StreamingInputCallResponse
-	(*ReconnectInfo)(nil),                        // 12: grpc.testing.ReconnectInfo
-	(*LoadBalancerStatsResponse)(nil),            // 13: grpc.testing.LoadBalancerStatsResponse
-	(*LoadBalancerAccumulatedStatsResponse)(nil), // 14: grpc.testing.LoadBalancerAccumulatedStatsResponse
-	(*HookResponse)(nil),                         // 15: grpc.testing.HookResponse
-	(*ClientConfigureResponse)(nil),              // 16: grpc.testing.ClientConfigureResponse
+	(*SetReturnStatusRequest)(nil),               // 7: grpc.testing.SetReturnStatusRequest
+	(*HookRequest)(nil),                          // 8: grpc.testing.HookRequest
+	(*ClientConfigureRequest)(nil),               // 9: grpc.testing.ClientConfigureRequest
+	(*SimpleResponse)(nil),                       // 10: grpc.testing.SimpleResponse
+	(*StreamingOutputCallResponse)(nil),          // 11: grpc.testing.StreamingOutputCallResponse
+	(*StreamingInputCallResponse)(nil),           // 12: grpc.testing.StreamingInputCallResponse
+	(*ReconnectInfo)(nil),                        // 13: grpc.testing.ReconnectInfo
+	(*LoadBalancerStatsResponse)(nil),            // 14: grpc.testing.LoadBalancerStatsResponse
+	(*LoadBalancerAccumulatedStatsResponse)(nil), // 15: grpc.testing.LoadBalancerAccumulatedStatsResponse
+	(*HookResponse)(nil),                         // 16: grpc.testing.HookResponse
+	(*ClientConfigureResponse)(nil),              // 17: grpc.testing.ClientConfigureResponse
 }
 var file_grpc_testing_test_proto_depIdxs = []int32{
 	0,  // 0: grpc.testing.TestService.EmptyCall:input_type -> grpc.testing.Empty
@@ -185,30 +195,34 @@ var file_grpc_testing_test_proto_depIdxs = []int32{
 	5,  // 11: grpc.testing.LoadBalancerStatsService.GetClientStats:input_type -> grpc.testing.LoadBalancerStatsRequest
 	6,  // 12: grpc.testing.LoadBalancerStatsService.GetClientAccumulatedStats:input_type -> grpc.testing.LoadBalancerAccumulatedStatsRequest
 	0,  // 13: grpc.testing.HookService.Hook:input_type -> grpc.testing.Empty
-	0,  // 14: grpc.testing.XdsUpdateHealthService.SetServing:input_type -> grpc.testing.Empty
-	0,  // 15: grpc.testing.XdsUpdateHealthService.SetNotServing:input_type -> grpc.testing.Empty
-	7,  // 16: grpc.testing.XdsUpdateHealthService.SendHookRequest:input_type -> grpc.testing.HookRequest
-	8,  // 17: grpc.testing.XdsUpdateClientConfigureService.Configure:input_type -> grpc.testing.ClientConfigureRequest
-	0,  // 18: grpc.testing.TestService.EmptyCall:output_type -> grpc.testing.Empty
-	9,  // 19: grpc.testing.TestService.UnaryCall:output_type -> grpc.testing.SimpleResponse
-	9,  // 20: grpc.testing.TestService.CacheableUnaryCall:output_type -> grpc.testing.SimpleResponse
-	10, // 21: grpc.testing.TestService.StreamingOutputCall:output_type -> grpc.testing.StreamingOutputCallResponse
-	11, // 22: grpc.testing.TestService.StreamingInputCall:output_type -> grpc.testing.StreamingInputCallResponse
-	10, // 23: grpc.testing.TestService.FullDuplexCall:output_type -> grpc.testing.StreamingOutputCallResponse
-	10, // 24: grpc.testing.TestService.HalfDuplexCall:output_type -> grpc.testing.StreamingOutputCallResponse
-	0,  // 25: grpc.testing.TestService.UnimplementedCall:output_type -> grpc.testing.Empty
-	0,  // 26: grpc.testing.UnimplementedService.UnimplementedCall:output_type -> grpc.testing.Empty
-	0,  // 27: grpc.testing.ReconnectService.Start:output_type -> grpc.testing.Empty
-	12, // 28: grpc.testing.ReconnectService.Stop:output_type -> grpc.testing.ReconnectInfo
-	13, // 29: grpc.testing.LoadBalancerStatsService.GetClientStats:output_type -> grpc.testing.LoadBalancerStatsResponse
-	14, // 30: grpc.testing.LoadBalancerStatsService.GetClientAccumulatedStats:output_type -> grpc.testing.LoadBalancerAccumulatedStatsResponse
-	0,  // 31: grpc.testing.HookService.Hook:output_type -> grpc.testing.Empty
-	0,  // 32: grpc.testing.XdsUpdateHealthService.SetServing:output_type -> grpc.testing.Empty
-	0,  // 33: grpc.testing.XdsUpdateHealthService.SetNotServing:output_type -> grpc.testing.Empty
-	15, // 34: grpc.testing.XdsUpdateHealthService.SendHookRequest:output_type -> grpc.testing.HookResponse
-	16, // 35: grpc.testing.XdsUpdateClientConfigureService.Configure:output_type -> grpc.testing.ClientConfigureResponse
-	18, // [18:36] is the sub-list for method output_type
-	0,  // [0:18] is the sub-list for method input_type
+	7,  // 14: grpc.testing.HookService.SetReturnStatus:input_type -> grpc.testing.SetReturnStatusRequest
+	0,  // 15: grpc.testing.HookService.ClearReturnStatus:input_type -> grpc.testing.Empty
+	0,  // 16: grpc.testing.XdsUpdateHealthService.SetServing:input_type -> grpc.testing.Empty
+	0,  // 17: grpc.testing.XdsUpdateHealthService.SetNotServing:input_type -> grpc.testing.Empty
+	8,  // 18: grpc.testing.XdsUpdateHealthService.SendHookRequest:input_type -> grpc.testing.HookRequest
+	9,  // 19: grpc.testing.XdsUpdateClientConfigureService.Configure:input_type -> grpc.testing.ClientConfigureRequest
+	0,  // 20: grpc.testing.TestService.EmptyCall:output_type -> grpc.testing.Empty
+	10, // 21: grpc.testing.TestService.UnaryCall:output_type -> grpc.testing.SimpleResponse
+	10, // 22: grpc.testing.TestService.CacheableUnaryCall:output_type -> grpc.testing.SimpleResponse
+	11, // 23: grpc.testing.TestService.StreamingOutputCall:output_type -> grpc.testing.StreamingOutputCallResponse
+	12, // 24: grpc.testing.TestService.StreamingInputCall:output_type -> grpc.testing.StreamingInputCallResponse
+	11, // 25: grpc.testing.TestService.FullDuplexCall:output_type -> grpc.testing.StreamingOutputCallResponse
+	11, // 26: grpc.testing.TestService.HalfDuplexCall:output_type -> grpc.testing.StreamingOutputCallResponse
+	0,  // 27: grpc.testing.TestService.UnimplementedCall:output_type -> grpc.testing.Empty
+	0,  // 28: grpc.testing.UnimplementedService.UnimplementedCall:output_type -> grpc.testing.Empty
+	0,  // 29: grpc.testing.ReconnectService.Start:output_type -> grpc.testing.Empty
+	13, // 30: grpc.testing.ReconnectService.Stop:output_type -> grpc.testing.ReconnectInfo
+	14, // 31: grpc.testing.LoadBalancerStatsService.GetClientStats:output_type -> grpc.testing.LoadBalancerStatsResponse
+	15, // 32: grpc.testing.LoadBalancerStatsService.GetClientAccumulatedStats:output_type -> grpc.testing.LoadBalancerAccumulatedStatsResponse
+	0,  // 33: grpc.testing.HookService.Hook:output_type -> grpc.testing.Empty
+	0,  // 34: grpc.testing.HookService.SetReturnStatus:output_type -> grpc.testing.Empty
+	0,  // 35: grpc.testing.HookService.ClearReturnStatus:output_type -> grpc.testing.Empty
+	0,  // 36: grpc.testing.XdsUpdateHealthService.SetServing:output_type -> grpc.testing.Empty
+	0,  // 37: grpc.testing.XdsUpdateHealthService.SetNotServing:output_type -> grpc.testing.Empty
+	16, // 38: grpc.testing.XdsUpdateHealthService.SendHookRequest:output_type -> grpc.testing.HookResponse
+	17, // 39: grpc.testing.XdsUpdateClientConfigureService.Configure:output_type -> grpc.testing.ClientConfigureResponse
+	20, // [20:40] is the sub-list for method output_type
+	0,  // [0:20] is the sub-list for method input_type
 	0,  // [0:0] is the sub-list for extension type_name
 	0,  // [0:0] is the sub-list for extension extendee
 	0,  // [0:0] is the sub-list for field type_name
diff --git a/interop/grpc_testing/test_grpc.pb.go b/interop/grpc_testing/test_grpc.pb.go
index 2d0181a7f34e..69de6d397c8c 100644
--- a/interop/grpc_testing/test_grpc.pb.go
+++ b/interop/grpc_testing/test_grpc.pb.go
@@ -898,14 +898,22 @@ var LoadBalancerStatsService_ServiceDesc = grpc.ServiceDesc{
 }
 
 const (
-	HookService_Hook_FullMethodName = "/grpc.testing.HookService/Hook"
+	HookService_Hook_FullMethodName              = "/grpc.testing.HookService/Hook"
+	HookService_SetReturnStatus_FullMethodName   = "/grpc.testing.HookService/SetReturnStatus"
+	HookService_ClearReturnStatus_FullMethodName = "/grpc.testing.HookService/ClearReturnStatus"
 )
 
 // HookServiceClient is the client API for HookService service.
 //
 // For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
 type HookServiceClient interface {
+	// Sends a request that will "hang" until the return status is set by a call
+	// to a SetReturnStatus
 	Hook(ctx context.Context, in *Empty, opts ...grpc.CallOption) (*Empty, error)
+	// Sets a return status for pending and upcoming calls to Hook
+	SetReturnStatus(ctx context.Context, in *SetReturnStatusRequest, opts ...grpc.CallOption) (*Empty, error)
+	// Clears the return status. Incoming calls to Hook will "hang"
+	ClearReturnStatus(ctx context.Context, in *Empty, opts ...grpc.CallOption) (*Empty, error)
 }
 
 type hookServiceClient struct {
@@ -925,11 +933,35 @@ func (c *hookServiceClient) Hook(ctx context.Context, in *Empty, opts ...grpc.Ca
 	return out, nil
 }
 
+func (c *hookServiceClient) SetReturnStatus(ctx context.Context, in *SetReturnStatusRequest, opts ...grpc.CallOption) (*Empty, error) {
+	out := new(Empty)
+	err := c.cc.Invoke(ctx, HookService_SetReturnStatus_FullMethodName, in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *hookServiceClient) ClearReturnStatus(ctx context.Context, in *Empty, opts ...grpc.CallOption) (*Empty, error) {
+	out := new(Empty)
+	err := c.cc.Invoke(ctx, HookService_ClearReturnStatus_FullMethodName, in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // HookServiceServer is the server API for HookService service.
 // All implementations must embed UnimplementedHookServiceServer
 // for forward compatibility
 type HookServiceServer interface {
+	// Sends a request that will "hang" until the return status is set by a call
+	// to a SetReturnStatus
 	Hook(context.Context, *Empty) (*Empty, error)
+	// Sets a return status for pending and upcoming calls to Hook
+	SetReturnStatus(context.Context, *SetReturnStatusRequest) (*Empty, error)
+	// Clears the return status. Incoming calls to Hook will "hang"
+	ClearReturnStatus(context.Context, *Empty) (*Empty, error)
 	mustEmbedUnimplementedHookServiceServer()
 }
 
@@ -940,6 +972,12 @@ type UnimplementedHookServiceServer struct {
 func (UnimplementedHookServiceServer) Hook(context.Context, *Empty) (*Empty, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method Hook not implemented")
 }
+func (UnimplementedHookServiceServer) SetReturnStatus(context.Context, *SetReturnStatusRequest) (*Empty, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method SetReturnStatus not implemented")
+}
+func (UnimplementedHookServiceServer) ClearReturnStatus(context.Context, *Empty) (*Empty, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method ClearReturnStatus not implemented")
+}
 func (UnimplementedHookServiceServer) mustEmbedUnimplementedHookServiceServer() {}
 
 // UnsafeHookServiceServer may be embedded to opt out of forward compatibility for this service.
@@ -971,6 +1009,42 @@ func _HookService_Hook_Handler(srv interface{}, ctx context.Context, dec func(in
 	return interceptor(ctx, in, info, handler)
 }
 
+func _HookService_SetReturnStatus_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(SetReturnStatusRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(HookServiceServer).SetReturnStatus(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: HookService_SetReturnStatus_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(HookServiceServer).SetReturnStatus(ctx, req.(*SetReturnStatusRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _HookService_ClearReturnStatus_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(Empty)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(HookServiceServer).ClearReturnStatus(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: HookService_ClearReturnStatus_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(HookServiceServer).ClearReturnStatus(ctx, req.(*Empty))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 // HookService_ServiceDesc is the grpc.ServiceDesc for HookService service.
 // It's only intended for direct use with grpc.RegisterService,
 // and not to be introspected or modified (even as a copy)
@@ -982,6 +1056,14 @@ var HookService_ServiceDesc = grpc.ServiceDesc{
 			MethodName: "Hook",
 			Handler:    _HookService_Hook_Handler,
 		},
+		{
+			MethodName: "SetReturnStatus",
+			Handler:    _HookService_SetReturnStatus_Handler,
+		},
+		{
+			MethodName: "ClearReturnStatus",
+			Handler:    _HookService_ClearReturnStatus_Handler,
+		},
 	},
 	Streams:  []grpc.StreamDesc{},
 	Metadata: "grpc/testing/test.proto",