auto-regenerate .pb.go files (#312)

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diff --git a/googleapis/cloud/dialogflow/v2/agent.pb.go b/googleapis/cloud/dialogflow/v2/agent.pb.go
index a1764ad..73a8cdb 100644
--- a/googleapis/cloud/dialogflow/v2/agent.pb.go
+++ b/googleapis/cloud/dialogflow/v2/agent.pb.go
@@ -909,6 +909,61 @@
 	}
 }
 
+// The request message for [Agents.GetValidationResult][google.cloud.dialogflow.v2.Agents.GetValidationResult].
+type GetValidationResultRequest struct {
+	// Required. The project that the agent is associated with.
+	// Format: `projects/<Project ID>`.
+	Parent string `protobuf:"bytes,1,opt,name=parent,proto3" json:"parent,omitempty"`
+	// Optional. The language for which you want a validation result. If not
+	// specified, the agent's default language is used. [Many
+	// languages](https://cloud.google.com/dialogflow/docs/reference/language)
+	// are supported. Note: languages must be enabled in the agent before they can
+	// be used.
+	LanguageCode         string   `protobuf:"bytes,3,opt,name=language_code,json=languageCode,proto3" json:"language_code,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *GetValidationResultRequest) Reset()         { *m = GetValidationResultRequest{} }
+func (m *GetValidationResultRequest) String() string { return proto.CompactTextString(m) }
+func (*GetValidationResultRequest) ProtoMessage()    {}
+func (*GetValidationResultRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_59198d2091110e70, []int{11}
+}
+
+func (m *GetValidationResultRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_GetValidationResultRequest.Unmarshal(m, b)
+}
+func (m *GetValidationResultRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_GetValidationResultRequest.Marshal(b, m, deterministic)
+}
+func (m *GetValidationResultRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_GetValidationResultRequest.Merge(m, src)
+}
+func (m *GetValidationResultRequest) XXX_Size() int {
+	return xxx_messageInfo_GetValidationResultRequest.Size(m)
+}
+func (m *GetValidationResultRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_GetValidationResultRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_GetValidationResultRequest proto.InternalMessageInfo
+
+func (m *GetValidationResultRequest) GetParent() string {
+	if m != nil {
+		return m.Parent
+	}
+	return ""
+}
+
+func (m *GetValidationResultRequest) GetLanguageCode() string {
+	if m != nil {
+		return m.LanguageCode
+	}
+	return ""
+}
+
 func init() {
 	proto.RegisterEnum("google.cloud.dialogflow.v2.Agent_MatchMode", Agent_MatchMode_name, Agent_MatchMode_value)
 	proto.RegisterEnum("google.cloud.dialogflow.v2.Agent_ApiVersion", Agent_ApiVersion_name, Agent_ApiVersion_value)
@@ -924,6 +979,7 @@
 	proto.RegisterType((*ExportAgentResponse)(nil), "google.cloud.dialogflow.v2.ExportAgentResponse")
 	proto.RegisterType((*ImportAgentRequest)(nil), "google.cloud.dialogflow.v2.ImportAgentRequest")
 	proto.RegisterType((*RestoreAgentRequest)(nil), "google.cloud.dialogflow.v2.RestoreAgentRequest")
+	proto.RegisterType((*GetValidationResultRequest)(nil), "google.cloud.dialogflow.v2.GetValidationResultRequest")
 }
 
 func init() {
@@ -931,96 +987,102 @@
 }
 
 var fileDescriptor_59198d2091110e70 = []byte{
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+	// 1506 bytes of a gzipped FileDescriptorProto
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+	0x21, 0x9e, 0xf5, 0xca, 0x3f, 0x01, 0x00, 0x00, 0xff, 0xff, 0xad, 0x7d, 0xe4, 0x5e, 0x69, 0x12,
+	0x00, 0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -1072,6 +1134,9 @@
 	//
 	// Operation <response: [google.protobuf.Empty][google.protobuf.Empty]>
 	RestoreAgent(ctx context.Context, in *RestoreAgentRequest, opts ...grpc.CallOption) (*longrunning.Operation, error)
+	// Gets agent validation result. Agent validation is performed during
+	// training time and is updated automatically when training is completed.
+	GetValidationResult(ctx context.Context, in *GetValidationResultRequest, opts ...grpc.CallOption) (*ValidationResult, error)
 }
 
 type agentsClient struct {
@@ -1154,6 +1219,15 @@
 	return out, nil
 }
 
+func (c *agentsClient) GetValidationResult(ctx context.Context, in *GetValidationResultRequest, opts ...grpc.CallOption) (*ValidationResult, error) {
+	out := new(ValidationResult)
+	err := c.cc.Invoke(ctx, "/google.cloud.dialogflow.v2.Agents/GetValidationResult", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // AgentsServer is the server API for Agents service.
 type AgentsServer interface {
 	// Retrieves the specified agent.
@@ -1193,6 +1267,9 @@
 	//
 	// Operation <response: [google.protobuf.Empty][google.protobuf.Empty]>
 	RestoreAgent(context.Context, *RestoreAgentRequest) (*longrunning.Operation, error)
+	// Gets agent validation result. Agent validation is performed during
+	// training time and is updated automatically when training is completed.
+	GetValidationResult(context.Context, *GetValidationResultRequest) (*ValidationResult, error)
 }
 
 // UnimplementedAgentsServer can be embedded to have forward compatible implementations.
@@ -1223,6 +1300,9 @@
 func (*UnimplementedAgentsServer) RestoreAgent(ctx context.Context, req *RestoreAgentRequest) (*longrunning.Operation, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method RestoreAgent not implemented")
 }
+func (*UnimplementedAgentsServer) GetValidationResult(ctx context.Context, req *GetValidationResultRequest) (*ValidationResult, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method GetValidationResult not implemented")
+}
 
 func RegisterAgentsServer(s *grpc.Server, srv AgentsServer) {
 	s.RegisterService(&_Agents_serviceDesc, srv)
@@ -1372,6 +1452,24 @@
 	return interceptor(ctx, in, info, handler)
 }
 
+func _Agents_GetValidationResult_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(GetValidationResultRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(AgentsServer).GetValidationResult(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/google.cloud.dialogflow.v2.Agents/GetValidationResult",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(AgentsServer).GetValidationResult(ctx, req.(*GetValidationResultRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 var _Agents_serviceDesc = grpc.ServiceDesc{
 	ServiceName: "google.cloud.dialogflow.v2.Agents",
 	HandlerType: (*AgentsServer)(nil),
@@ -1408,6 +1506,10 @@
 			MethodName: "RestoreAgent",
 			Handler:    _Agents_RestoreAgent_Handler,
 		},
+		{
+			MethodName: "GetValidationResult",
+			Handler:    _Agents_GetValidationResult_Handler,
+		},
 	},
 	Streams:  []grpc.StreamDesc{},
 	Metadata: "google/cloud/dialogflow/v2/agent.proto",
diff --git a/googleapis/cloud/dialogflow/v2/audio_config.pb.go b/googleapis/cloud/dialogflow/v2/audio_config.pb.go
index e5bb34c..c4c1644 100644
--- a/googleapis/cloud/dialogflow/v2/audio_config.pb.go
+++ b/googleapis/cloud/dialogflow/v2/audio_config.pb.go
@@ -696,13 +696,13 @@
 type OutputAudioConfig struct {
 	// Required. Audio encoding of the synthesized audio content.
 	AudioEncoding OutputAudioEncoding `protobuf:"varint,1,opt,name=audio_encoding,json=audioEncoding,proto3,enum=google.cloud.dialogflow.v2.OutputAudioEncoding" json:"audio_encoding,omitempty"`
-	// Optional. The synthesis sample rate (in hertz) for this audio. If not
+	// The synthesis sample rate (in hertz) for this audio. If not
 	// provided, then the synthesizer will use the default sample rate based on
 	// the audio encoding. If this is different from the voice's natural sample
 	// rate, then the synthesizer will honor this request by converting to the
 	// desired sample rate (which might result in worse audio quality).
 	SampleRateHertz int32 `protobuf:"varint,2,opt,name=sample_rate_hertz,json=sampleRateHertz,proto3" json:"sample_rate_hertz,omitempty"`
-	// Optional. Configuration of how speech should be synthesized.
+	// Configuration of how speech should be synthesized.
 	SynthesizeSpeechConfig *SynthesizeSpeechConfig `protobuf:"bytes,3,opt,name=synthesize_speech_config,json=synthesizeSpeechConfig,proto3" json:"synthesize_speech_config,omitempty"`
 	XXX_NoUnkeyedLiteral   struct{}                `json:"-"`
 	XXX_unrecognized       []byte                  `json:"-"`
@@ -773,78 +773,78 @@
 }
 
 var fileDescriptor_3ff9be2146363af6 = []byte{
-	// 1155 bytes of a gzipped FileDescriptorProto
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+	0x13, 0x70, 0xb7, 0x3d, 0x8b, 0xd6, 0x36, 0xee, 0xfb, 0xf7, 0x6c, 0x5c, 0x69, 0xdb, 0x35, 0x2b,
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+	0x2f, 0xaf, 0xac, 0xbf, 0x35, 0xed, 0xb7, 0x44, 0xc2, 0x3a, 0xfd, 0x23, 0x71, 0x54, 0x8b, 0xcb,
+	0x55, 0xd5, 0xf5, 0xd6, 0xd5, 0xf5, 0xe7, 0xe5, 0xc1, 0x2d, 0x55, 0xf5, 0xd5, 0xbf, 0x01, 0x00,
+	0x00, 0xff, 0xff, 0x5f, 0x98, 0x4d, 0xe2, 0x9a, 0x09, 0x00, 0x00,
 }
diff --git a/googleapis/cloud/dialogflow/v2/session.pb.go b/googleapis/cloud/dialogflow/v2/session.pb.go
index d9ee867..4c2b582 100644
--- a/googleapis/cloud/dialogflow/v2/session.pb.go
+++ b/googleapis/cloud/dialogflow/v2/session.pb.go
@@ -14,6 +14,7 @@
 	_ "google.golang.org/genproto/googleapis/api/annotations"
 	status "google.golang.org/genproto/googleapis/rpc/status"
 	latlng "google.golang.org/genproto/googleapis/type/latlng"
+	field_mask "google.golang.org/genproto/protobuf/field_mask"
 	grpc "google.golang.org/grpc"
 	codes "google.golang.org/grpc/codes"
 	status1 "google.golang.org/grpc/status"
@@ -78,7 +79,7 @@
 	// some type of user identifier (preferably hashed). The length of the session
 	// ID must not exceed 36 bytes.
 	Session string `protobuf:"bytes,1,opt,name=session,proto3" json:"session,omitempty"`
-	// Optional. The parameters of this query.
+	// The parameters of this query.
 	QueryParams *QueryParameters `protobuf:"bytes,2,opt,name=query_params,json=queryParams,proto3" json:"query_params,omitempty"`
 	// Required. The input specification. It can be set to:
 	//
@@ -89,11 +90,18 @@
 	//
 	// 3.  an event that specifies which intent to trigger.
 	QueryInput *QueryInput `protobuf:"bytes,3,opt,name=query_input,json=queryInput,proto3" json:"query_input,omitempty"`
-	// Optional. Instructs the speech synthesizer how to generate the output
+	// Instructs the speech synthesizer how to generate the output
 	// audio. If this field is not set and agent-level speech synthesizer is not
 	// configured, no output audio is generated.
 	OutputAudioConfig *OutputAudioConfig `protobuf:"bytes,4,opt,name=output_audio_config,json=outputAudioConfig,proto3" json:"output_audio_config,omitempty"`
-	// Optional. The natural language speech audio to be processed. This field
+	// Mask for [output_audio_config][google.cloud.dialogflow.v2.DetectIntentRequest.output_audio_config] indicating which settings in this
+	// request-level config should override speech synthesizer settings defined at
+	// agent-level.
+	//
+	// If unspecified or empty, [output_audio_config][google.cloud.dialogflow.v2.DetectIntentRequest.output_audio_config] replaces the agent-level
+	// config in its entirety.
+	OutputAudioConfigMask *field_mask.FieldMask `protobuf:"bytes,7,opt,name=output_audio_config_mask,json=outputAudioConfigMask,proto3" json:"output_audio_config_mask,omitempty"`
+	// The natural language speech audio to be processed. This field
 	// should be populated iff `query_input` is set to an input audio config.
 	// A single request can contain up to 1 minute of speech audio data.
 	InputAudio           []byte   `protobuf:"bytes,5,opt,name=input_audio,json=inputAudio,proto3" json:"input_audio,omitempty"`
@@ -155,6 +163,13 @@
 	return nil
 }
 
+func (m *DetectIntentRequest) GetOutputAudioConfigMask() *field_mask.FieldMask {
+	if m != nil {
+		return m.OutputAudioConfigMask
+	}
+	return nil
+}
+
 func (m *DetectIntentRequest) GetInputAudio() []byte {
 	if m != nil {
 		return m.InputAudio
@@ -248,27 +263,27 @@
 
 // Represents the parameters of the conversational query.
 type QueryParameters struct {
-	// Optional. The time zone of this conversational query from the
+	// The time zone of this conversational query from the
 	// [time zone database](https://www.iana.org/time-zones), e.g.,
 	// America/New_York, Europe/Paris. If not provided, the time zone specified in
 	// agent settings is used.
 	TimeZone string `protobuf:"bytes,1,opt,name=time_zone,json=timeZone,proto3" json:"time_zone,omitempty"`
-	// Optional. The geo location of this conversational query.
+	// The geo location of this conversational query.
 	GeoLocation *latlng.LatLng `protobuf:"bytes,2,opt,name=geo_location,json=geoLocation,proto3" json:"geo_location,omitempty"`
-	// Optional. The collection of contexts to be activated before this query is
+	// The collection of contexts to be activated before this query is
 	// executed.
 	Contexts []*Context `protobuf:"bytes,3,rep,name=contexts,proto3" json:"contexts,omitempty"`
-	// Optional. Specifies whether to delete all contexts in the current session
+	// Specifies whether to delete all contexts in the current session
 	// before the new ones are activated.
 	ResetContexts bool `protobuf:"varint,4,opt,name=reset_contexts,json=resetContexts,proto3" json:"reset_contexts,omitempty"`
-	// Optional. Additional session entity types to replace or extend developer
+	// Additional session entity types to replace or extend developer
 	// entity types with. The entity synonyms apply to all languages and persist
 	// for the session of this query.
 	SessionEntityTypes []*SessionEntityType `protobuf:"bytes,5,rep,name=session_entity_types,json=sessionEntityTypes,proto3" json:"session_entity_types,omitempty"`
-	// Optional. This field can be used to pass custom data into the webhook
+	// This field can be used to pass custom data into the webhook
 	// associated with the agent. Arbitrary JSON objects are supported.
 	Payload *_struct.Struct `protobuf:"bytes,6,opt,name=payload,proto3" json:"payload,omitempty"`
-	// Optional. Configures the type of sentiment analysis to perform. If not
+	// Configures the type of sentiment analysis to perform. If not
 	// provided, sentiment analysis is not performed.
 	SentimentAnalysisRequestConfig *SentimentAnalysisRequestConfig `protobuf:"bytes,10,opt,name=sentiment_analysis_request_config,json=sentimentAnalysisRequestConfig,proto3" json:"sentiment_analysis_request_config,omitempty"`
 	XXX_NoUnkeyedLiteral           struct{}                        `json:"-"`
@@ -706,7 +721,7 @@
 	// some type of user identifier (preferably hashed). The length of the session
 	// ID must not exceed 36 characters.
 	Session string `protobuf:"bytes,1,opt,name=session,proto3" json:"session,omitempty"`
-	// Optional. The parameters of this query.
+	// The parameters of this query.
 	QueryParams *QueryParameters `protobuf:"bytes,2,opt,name=query_params,json=queryParams,proto3" json:"query_params,omitempty"`
 	// Required. The input specification. It can be set to:
 	//
@@ -717,7 +732,7 @@
 	//
 	// 3.  an event that specifies which intent to trigger.
 	QueryInput *QueryInput `protobuf:"bytes,3,opt,name=query_input,json=queryInput,proto3" json:"query_input,omitempty"`
-	// Optional. Please use [InputAudioConfig.single_utterance][google.cloud.dialogflow.v2.InputAudioConfig.single_utterance] instead.
+	// Please use [InputAudioConfig.single_utterance][google.cloud.dialogflow.v2.InputAudioConfig.single_utterance] instead.
 	// If `false` (default), recognition does not cease until
 	// the client closes the stream. If `true`, the recognizer will detect a
 	// single spoken utterance in input audio. Recognition ceases when it detects
@@ -726,11 +741,18 @@
 	// request with a new stream as needed.
 	// This setting is ignored when `query_input` is a piece of text or an event.
 	SingleUtterance bool `protobuf:"varint,4,opt,name=single_utterance,json=singleUtterance,proto3" json:"single_utterance,omitempty"` // Deprecated: Do not use.
-	// Optional. Instructs the speech synthesizer how to generate the output
+	// Instructs the speech synthesizer how to generate the output
 	// audio. If this field is not set and agent-level speech synthesizer is not
 	// configured, no output audio is generated.
 	OutputAudioConfig *OutputAudioConfig `protobuf:"bytes,5,opt,name=output_audio_config,json=outputAudioConfig,proto3" json:"output_audio_config,omitempty"`
-	// Optional. The input audio content to be recognized. Must be sent if
+	// Mask for [output_audio_config][google.cloud.dialogflow.v2.StreamingDetectIntentRequest.output_audio_config] indicating which settings in this
+	// request-level config should override speech synthesizer settings defined at
+	// agent-level.
+	//
+	// If unspecified or empty, [output_audio_config][google.cloud.dialogflow.v2.StreamingDetectIntentRequest.output_audio_config] replaces the agent-level
+	// config in its entirety.
+	OutputAudioConfigMask *field_mask.FieldMask `protobuf:"bytes,7,opt,name=output_audio_config_mask,json=outputAudioConfigMask,proto3" json:"output_audio_config_mask,omitempty"`
+	// The input audio content to be recognized. Must be sent if
 	// `query_input` was set to a streaming input audio config. The complete audio
 	// over all streaming messages must not exceed 1 minute.
 	InputAudio           []byte   `protobuf:"bytes,6,opt,name=input_audio,json=inputAudio,proto3" json:"input_audio,omitempty"`
@@ -800,6 +822,13 @@
 	return nil
 }
 
+func (m *StreamingDetectIntentRequest) GetOutputAudioConfigMask() *field_mask.FieldMask {
+	if m != nil {
+		return m.OutputAudioConfigMask
+	}
+	return nil
+}
+
 func (m *StreamingDetectIntentRequest) GetInputAudio() []byte {
 	if m != nil {
 		return m.InputAudio
@@ -1103,7 +1132,7 @@
 type EventInput struct {
 	// Required. The unique identifier of the event.
 	Name string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
-	// Optional. The collection of parameters associated with the event.
+	// The collection of parameters associated with the event.
 	Parameters *_struct.Struct `protobuf:"bytes,2,opt,name=parameters,proto3" json:"parameters,omitempty"`
 	// Required. The language of this query. See [Language
 	// Support](https://cloud.google.com/dialogflow/docs/reference/language)
@@ -1163,7 +1192,7 @@
 
 // Configures the types of sentiment analysis to perform.
 type SentimentAnalysisRequestConfig struct {
-	// Optional. Instructs the service to perform sentiment analysis on
+	// Instructs the service to perform sentiment analysis on
 	// `query_text`. If not provided, sentiment analysis is not performed on
 	// `query_text`.
 	AnalyzeQueryTextSentiment bool     `protobuf:"varint,1,opt,name=analyze_query_text_sentiment,json=analyzeQueryTextSentiment,proto3" json:"analyze_query_text_sentiment,omitempty"`
@@ -1321,122 +1350,123 @@
 }
 
 var fileDescriptor_2f8892c06d516e44 = []byte{
-	// 1836 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xd4, 0x58, 0xcf, 0x73, 0x1b, 0x49,
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+	0xf3, 0xe4, 0x09, 0x16, 0x00, 0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
diff --git a/googleapis/cloud/dialogflow/v2/validation_result.pb.go b/googleapis/cloud/dialogflow/v2/validation_result.pb.go
new file mode 100644
index 0000000..c11572e
--- /dev/null
+++ b/googleapis/cloud/dialogflow/v2/validation_result.pb.go
@@ -0,0 +1,214 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// source: google/cloud/dialogflow/v2/validation_result.proto
+
+package dialogflow
+
+import (
+	fmt "fmt"
+	math "math"
+
+	proto "github.com/golang/protobuf/proto"
+	_ "google.golang.org/genproto/googleapis/api/annotations"
+)
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ = proto.Marshal
+var _ = fmt.Errorf
+var _ = math.Inf
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the proto package it is being compiled against.
+// A compilation error at this line likely means your copy of the
+// proto package needs to be updated.
+const _ = proto.ProtoPackageIsVersion3 // please upgrade the proto package
+
+// Represents a level of severity.
+type ValidationError_Severity int32
+
+const (
+	// Not specified. This value should never be used.
+	ValidationError_SEVERITY_UNSPECIFIED ValidationError_Severity = 0
+	// The agent doesn't follow Dialogflow best practicies.
+	ValidationError_INFO ValidationError_Severity = 1
+	// The agent may not behave as expected.
+	ValidationError_WARNING ValidationError_Severity = 2
+	// The agent may experience partial failures.
+	ValidationError_ERROR ValidationError_Severity = 3
+	// The agent may completely fail.
+	ValidationError_CRITICAL ValidationError_Severity = 4
+)
+
+var ValidationError_Severity_name = map[int32]string{
+	0: "SEVERITY_UNSPECIFIED",
+	1: "INFO",
+	2: "WARNING",
+	3: "ERROR",
+	4: "CRITICAL",
+}
+
+var ValidationError_Severity_value = map[string]int32{
+	"SEVERITY_UNSPECIFIED": 0,
+	"INFO":                 1,
+	"WARNING":              2,
+	"ERROR":                3,
+	"CRITICAL":             4,
+}
+
+func (x ValidationError_Severity) String() string {
+	return proto.EnumName(ValidationError_Severity_name, int32(x))
+}
+
+func (ValidationError_Severity) EnumDescriptor() ([]byte, []int) {
+	return fileDescriptor_7da0ebf221ed64af, []int{0, 0}
+}
+
+// Represents a single validation error.
+type ValidationError struct {
+	// The severity of the error.
+	Severity ValidationError_Severity `protobuf:"varint,1,opt,name=severity,proto3,enum=google.cloud.dialogflow.v2.ValidationError_Severity" json:"severity,omitempty"`
+	// The names of the entries that the error is associated with.
+	// Format:
+	//
+	// - "projects/<Project ID>/agent", if the error is associated with the entire
+	// agent.
+	// - "projects/<Project ID>/agent/intents/<Intent ID>", if the error is
+	// associated with certain intents.
+	// - "projects/<Project
+	// ID>/agent/intents/<Intent Id>/trainingPhrases/<Training Phrase ID>", if the
+	// error is associated with certain intent training phrases.
+	// - "projects/<Project ID>/agent/intents/<Intent Id>/parameters/<Parameter
+	// ID>", if the error is associated with certain intent parameters.
+	// - "projects/<Project ID>/agent/entities/<Entity ID>", if the error is
+	// associated with certain entities.
+	Entries []string `protobuf:"bytes,3,rep,name=entries,proto3" json:"entries,omitempty"`
+	// The detailed error messsage.
+	ErrorMessage         string   `protobuf:"bytes,4,opt,name=error_message,json=errorMessage,proto3" json:"error_message,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *ValidationError) Reset()         { *m = ValidationError{} }
+func (m *ValidationError) String() string { return proto.CompactTextString(m) }
+func (*ValidationError) ProtoMessage()    {}
+func (*ValidationError) Descriptor() ([]byte, []int) {
+	return fileDescriptor_7da0ebf221ed64af, []int{0}
+}
+
+func (m *ValidationError) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_ValidationError.Unmarshal(m, b)
+}
+func (m *ValidationError) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_ValidationError.Marshal(b, m, deterministic)
+}
+func (m *ValidationError) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_ValidationError.Merge(m, src)
+}
+func (m *ValidationError) XXX_Size() int {
+	return xxx_messageInfo_ValidationError.Size(m)
+}
+func (m *ValidationError) XXX_DiscardUnknown() {
+	xxx_messageInfo_ValidationError.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_ValidationError proto.InternalMessageInfo
+
+func (m *ValidationError) GetSeverity() ValidationError_Severity {
+	if m != nil {
+		return m.Severity
+	}
+	return ValidationError_SEVERITY_UNSPECIFIED
+}
+
+func (m *ValidationError) GetEntries() []string {
+	if m != nil {
+		return m.Entries
+	}
+	return nil
+}
+
+func (m *ValidationError) GetErrorMessage() string {
+	if m != nil {
+		return m.ErrorMessage
+	}
+	return ""
+}
+
+// Represents the output of agent validation.
+type ValidationResult struct {
+	// Contains all validation errors.
+	ValidationErrors     []*ValidationError `protobuf:"bytes,1,rep,name=validation_errors,json=validationErrors,proto3" json:"validation_errors,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}           `json:"-"`
+	XXX_unrecognized     []byte             `json:"-"`
+	XXX_sizecache        int32              `json:"-"`
+}
+
+func (m *ValidationResult) Reset()         { *m = ValidationResult{} }
+func (m *ValidationResult) String() string { return proto.CompactTextString(m) }
+func (*ValidationResult) ProtoMessage()    {}
+func (*ValidationResult) Descriptor() ([]byte, []int) {
+	return fileDescriptor_7da0ebf221ed64af, []int{1}
+}
+
+func (m *ValidationResult) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_ValidationResult.Unmarshal(m, b)
+}
+func (m *ValidationResult) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_ValidationResult.Marshal(b, m, deterministic)
+}
+func (m *ValidationResult) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_ValidationResult.Merge(m, src)
+}
+func (m *ValidationResult) XXX_Size() int {
+	return xxx_messageInfo_ValidationResult.Size(m)
+}
+func (m *ValidationResult) XXX_DiscardUnknown() {
+	xxx_messageInfo_ValidationResult.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_ValidationResult proto.InternalMessageInfo
+
+func (m *ValidationResult) GetValidationErrors() []*ValidationError {
+	if m != nil {
+		return m.ValidationErrors
+	}
+	return nil
+}
+
+func init() {
+	proto.RegisterEnum("google.cloud.dialogflow.v2.ValidationError_Severity", ValidationError_Severity_name, ValidationError_Severity_value)
+	proto.RegisterType((*ValidationError)(nil), "google.cloud.dialogflow.v2.ValidationError")
+	proto.RegisterType((*ValidationResult)(nil), "google.cloud.dialogflow.v2.ValidationResult")
+}
+
+func init() {
+	proto.RegisterFile("google/cloud/dialogflow/v2/validation_result.proto", fileDescriptor_7da0ebf221ed64af)
+}
+
+var fileDescriptor_7da0ebf221ed64af = []byte{
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+}