diff --git a/interop/grpc_testing/messages.pb.go b/interop/grpc_testing/messages.pb.go
index de3cb7aff..e251f17ea 100644
--- a/interop/grpc_testing/messages.pb.go
+++ b/interop/grpc_testing/messages.pb.go
@@ -139,74 +139,25 @@ func (GrpclbRouteType) EnumDescriptor() ([]byte, []int) {
 	return file_grpc_testing_messages_proto_rawDescGZIP(), []int{1}
 }
 
-type HookRequestCommand int32
-
-const (
-	// Start the HTTP endpoint
-	HookRequestCommand_START HookRequestCommand = 0
-	// Stop
-	HookRequestCommand_STOP HookRequestCommand = 1
-	// Return from HTTP GET/POST
-	HookRequestCommand_RETURN HookRequestCommand = 2
-)
-
-// Enum value maps for HookRequestCommand.
-var (
-	HookRequestCommand_name = map[int32]string{
-		0: "START",
-		1: "STOP",
-		2: "RETURN",
-	}
-	HookRequestCommand_value = map[string]int32{
-		"START":  0,
-		"STOP":   1,
-		"RETURN": 2,
-	}
-)
-
-func (x HookRequestCommand) Enum() *HookRequestCommand {
-	p := new(HookRequestCommand)
-	*p = x
-	return p
-}
-
-func (x HookRequestCommand) String() string {
-	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
-}
-
-func (HookRequestCommand) Descriptor() protoreflect.EnumDescriptor {
-	return file_grpc_testing_messages_proto_enumTypes[2].Descriptor()
-}
-
-func (HookRequestCommand) Type() protoreflect.EnumType {
-	return &file_grpc_testing_messages_proto_enumTypes[2]
-}
-
-func (x HookRequestCommand) Number() protoreflect.EnumNumber {
-	return protoreflect.EnumNumber(x)
-}
-
-// Deprecated: Use HookRequestCommand.Descriptor instead.
-func (HookRequestCommand) EnumDescriptor() ([]byte, []int) {
-	return file_grpc_testing_messages_proto_rawDescGZIP(), []int{2}
-}
-
 type LoadBalancerStatsResponse_MetadataType int32
 
 const (
-	LoadBalancerStatsResponse_Initial  LoadBalancerStatsResponse_MetadataType = 0
-	LoadBalancerStatsResponse_Trailing LoadBalancerStatsResponse_MetadataType = 1
+	LoadBalancerStatsResponse_UNKNOWN  LoadBalancerStatsResponse_MetadataType = 0
+	LoadBalancerStatsResponse_INITIAL  LoadBalancerStatsResponse_MetadataType = 1
+	LoadBalancerStatsResponse_TRAILING LoadBalancerStatsResponse_MetadataType = 2
 )
 
 // Enum value maps for LoadBalancerStatsResponse_MetadataType.
 var (
 	LoadBalancerStatsResponse_MetadataType_name = map[int32]string{
-		0: "Initial",
-		1: "Trailing",
+		0: "UNKNOWN",
+		1: "INITIAL",
+		2: "TRAILING",
 	}
 	LoadBalancerStatsResponse_MetadataType_value = map[string]int32{
-		"Initial":  0,
-		"Trailing": 1,
+		"UNKNOWN":  0,
+		"INITIAL":  1,
+		"TRAILING": 2,
 	}
 )
 
@@ -221,11 +172,11 @@ func (x LoadBalancerStatsResponse_MetadataType) String() string {
 }
 
 func (LoadBalancerStatsResponse_MetadataType) Descriptor() protoreflect.EnumDescriptor {
-	return file_grpc_testing_messages_proto_enumTypes[3].Descriptor()
+	return file_grpc_testing_messages_proto_enumTypes[2].Descriptor()
 }
 
 func (LoadBalancerStatsResponse_MetadataType) Type() protoreflect.EnumType {
-	return &file_grpc_testing_messages_proto_enumTypes[3]
+	return &file_grpc_testing_messages_proto_enumTypes[2]
 }
 
 func (x LoadBalancerStatsResponse_MetadataType) Number() protoreflect.EnumNumber {
@@ -268,11 +219,11 @@ func (x ClientConfigureRequest_RpcType) String() string {
 }
 
 func (ClientConfigureRequest_RpcType) Descriptor() protoreflect.EnumDescriptor {
-	return file_grpc_testing_messages_proto_enumTypes[4].Descriptor()
+	return file_grpc_testing_messages_proto_enumTypes[3].Descriptor()
 }
 
 func (ClientConfigureRequest_RpcType) Type() protoreflect.EnumType {
-	return &file_grpc_testing_messages_proto_enumTypes[4]
+	return &file_grpc_testing_messages_proto_enumTypes[3]
 }
 
 func (x ClientConfigureRequest_RpcType) Number() protoreflect.EnumNumber {
@@ -284,6 +235,62 @@ func (ClientConfigureRequest_RpcType) EnumDescriptor() ([]byte, []int) {
 	return file_grpc_testing_messages_proto_rawDescGZIP(), []int{16, 0}
 }
 
+type HookRequest_HookRequestCommand int32
+
+const (
+	// Default value
+	HookRequest_UNSPECIFIED HookRequest_HookRequestCommand = 0
+	// Start the HTTP endpoint
+	HookRequest_START HookRequest_HookRequestCommand = 1
+	// Stop
+	HookRequest_STOP HookRequest_HookRequestCommand = 2
+	// Return from HTTP GET/POST
+	HookRequest_RETURN HookRequest_HookRequestCommand = 3
+)
+
+// Enum value maps for HookRequest_HookRequestCommand.
+var (
+	HookRequest_HookRequestCommand_name = map[int32]string{
+		0: "UNSPECIFIED",
+		1: "START",
+		2: "STOP",
+		3: "RETURN",
+	}
+	HookRequest_HookRequestCommand_value = map[string]int32{
+		"UNSPECIFIED": 0,
+		"START":       1,
+		"STOP":        2,
+		"RETURN":      3,
+	}
+)
+
+func (x HookRequest_HookRequestCommand) Enum() *HookRequest_HookRequestCommand {
+	p := new(HookRequest_HookRequestCommand)
+	*p = x
+	return p
+}
+
+func (x HookRequest_HookRequestCommand) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (HookRequest_HookRequestCommand) Descriptor() protoreflect.EnumDescriptor {
+	return file_grpc_testing_messages_proto_enumTypes[4].Descriptor()
+}
+
+func (HookRequest_HookRequestCommand) Type() protoreflect.EnumType {
+	return &file_grpc_testing_messages_proto_enumTypes[4]
+}
+
+func (x HookRequest_HookRequestCommand) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Use HookRequest_HookRequestCommand.Descriptor instead.
+func (HookRequest_HookRequestCommand) EnumDescriptor() ([]byte, []int) {
+	return file_grpc_testing_messages_proto_rawDescGZIP(), []int{20, 0}
+}
+
 // TODO(dgq): Go back to using well-known types once
 // https://github.com/grpc/grpc/issues/6980 has been fixed.
 // import "google/protobuf/wrappers.proto";
@@ -1617,9 +1624,9 @@ type HookRequest struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Command               HookRequestCommand `protobuf:"varint,1,opt,name=command,proto3,enum=grpc.testing.HookRequestCommand" json:"command,omitempty"`
-	GrpcCodeToReturn      int32              `protobuf:"varint,2,opt,name=grpc_code_to_return,json=grpcCodeToReturn,proto3" json:"grpc_code_to_return,omitempty"`
-	GrpcStatusDescription string             `protobuf:"bytes,3,opt,name=grpc_status_description,json=grpcStatusDescription,proto3" json:"grpc_status_description,omitempty"`
+	Command               HookRequest_HookRequestCommand `protobuf:"varint,1,opt,name=command,proto3,enum=grpc.testing.HookRequest_HookRequestCommand" json:"command,omitempty"`
+	GrpcCodeToReturn      int32                          `protobuf:"varint,2,opt,name=grpc_code_to_return,json=grpcCodeToReturn,proto3" json:"grpc_code_to_return,omitempty"`
+	GrpcStatusDescription string                         `protobuf:"bytes,3,opt,name=grpc_status_description,json=grpcStatusDescription,proto3" json:"grpc_status_description,omitempty"`
 	// Server port to listen to
 	ServerPort int32 `protobuf:"varint,4,opt,name=server_port,json=serverPort,proto3" json:"server_port,omitempty"`
 }
@@ -1656,11 +1663,11 @@ func (*HookRequest) Descriptor() ([]byte, []int) {
 	return file_grpc_testing_messages_proto_rawDescGZIP(), []int{20}
 }
 
-func (x *HookRequest) GetCommand() HookRequestCommand {
+func (x *HookRequest) GetCommand() HookRequest_HookRequestCommand {
 	if x != nil {
 		return x.Command
 	}
-	return HookRequestCommand_START
+	return HookRequest_UNSPECIFIED
 }
 
 func (x *HookRequest) GetGrpcCodeToReturn() int32 {
@@ -1732,7 +1739,7 @@ type LoadBalancerStatsResponse_MetadataEntry struct {
 	Key string `protobuf:"bytes,1,opt,name=key,proto3" json:"key,omitempty"`
 	// Value, exactly as received from the server.
 	Value string `protobuf:"bytes,2,opt,name=value,proto3" json:"value,omitempty"`
-	// Metadata type is either Initial or Trailing
+	// Metadata type
 	Type LoadBalancerStatsResponse_MetadataType `protobuf:"varint,3,opt,name=type,proto3,enum=grpc.testing.LoadBalancerStatsResponse_MetadataType" json:"type,omitempty"`
 }
 
@@ -1786,7 +1793,7 @@ func (x *LoadBalancerStatsResponse_MetadataEntry) GetType() LoadBalancerStatsRes
 	if x != nil {
 		return x.Type
 	}
-	return LoadBalancerStatsResponse_Initial
+	return LoadBalancerStatsResponse_UNKNOWN
 }
 
 type LoadBalancerStatsResponse_RpcMetadata struct {
@@ -2196,7 +2203,7 @@ var file_grpc_testing_messages_proto_rawDesc = []byte{
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@@ -2269,165 +2276,168 @@ var file_grpc_testing_messages_proto_rawDesc = []byte{
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 var (
@@ -2447,9 +2457,9 @@ var file_grpc_testing_messages_proto_msgTypes = make([]protoimpl.MessageInfo, 39
 var file_grpc_testing_messages_proto_goTypes = []interface{}{
 	(PayloadType)(0),                                 // 0: grpc.testing.PayloadType
 	(GrpclbRouteType)(0),                             // 1: grpc.testing.GrpclbRouteType
-	(HookRequestCommand)(0),                          // 2: grpc.testing.HookRequestCommand
-	(LoadBalancerStatsResponse_MetadataType)(0),      // 3: grpc.testing.LoadBalancerStatsResponse.MetadataType
-	(ClientConfigureRequest_RpcType)(0),              // 4: grpc.testing.ClientConfigureRequest.RpcType
+	(LoadBalancerStatsResponse_MetadataType)(0),      // 2: grpc.testing.LoadBalancerStatsResponse.MetadataType
+	(ClientConfigureRequest_RpcType)(0),              // 3: grpc.testing.ClientConfigureRequest.RpcType
+	(HookRequest_HookRequestCommand)(0),              // 4: grpc.testing.HookRequest.HookRequestCommand
 	(*BoolValue)(nil),                                // 5: grpc.testing.BoolValue
 	(*Payload)(nil),                                  // 6: grpc.testing.Payload
 	(*EchoStatus)(nil),                               // 7: grpc.testing.EchoStatus
@@ -2516,12 +2526,12 @@ var file_grpc_testing_messages_proto_depIdxs = []int32{
 	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
-	4,  // 25: grpc.testing.ClientConfigureRequest.types:type_name -> grpc.testing.ClientConfigureRequest.RpcType
+	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
-	2,  // 29: grpc.testing.HookRequest.command:type_name -> grpc.testing.HookRequestCommand
-	3,  // 30: grpc.testing.LoadBalancerStatsResponse.MetadataEntry.type:type_name -> grpc.testing.LoadBalancerStatsResponse.MetadataType
+	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
@@ -2529,7 +2539,7 @@ var file_grpc_testing_messages_proto_depIdxs = []int32{
 	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
-	4,  // 38: grpc.testing.ClientConfigureRequest.Metadata.type:type_name -> grpc.testing.ClientConfigureRequest.RpcType
+	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
 	39, // [39:39] is the sub-list for extension type_name