diff --git a/.gitmodules b/.gitmodules
index 7ae9daf..958ce0c 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,4 +1,4 @@
 [submodule "opentelemetry-proto"]
 	path = opentelemetry-proto
 	url = https://github.com/open-telemetry/opentelemetry-proto
-	branch = v0.19.0
+	branch = v0.20.0
diff --git a/opentelemetry-proto b/opentelemetry-proto
index 6459e1a..1608f92 160000
--- a/opentelemetry-proto
+++ b/opentelemetry-proto
@@ -1 +1 @@
-Subproject commit 6459e1aae1c22e273ac92be86016f0ae55a2430a
+Subproject commit 1608f92cf08119f9aec237c910b200d1317ec696
diff --git a/otlp/collector/trace/v1/trace_service.pb.gw.go b/otlp/collector/trace/v1/trace_service.pb.gw.go
index 9e05db0..bb1bd26 100644
--- a/otlp/collector/trace/v1/trace_service.pb.gw.go
+++ b/otlp/collector/trace/v1/trace_service.pb.gw.go
@@ -79,7 +79,7 @@ func RegisterTraceServiceHandlerServer(ctx context.Context, mux *runtime.ServeMu
 		inboundMarshaler, outboundMarshaler := runtime.MarshalerForRequest(mux, req)
 		var err error
 		var annotatedContext context.Context
-		annotatedContext, err = runtime.AnnotateIncomingContext(ctx, mux, req, "/opentelemetry.proto.collector.trace.v1.TraceService/Export", runtime.WithHTTPPathPattern("/v1/trace"))
+		annotatedContext, err = runtime.AnnotateIncomingContext(ctx, mux, req, "/opentelemetry.proto.collector.trace.v1.TraceService/Export", runtime.WithHTTPPathPattern("/v1/traces"))
 		if err != nil {
 			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
 			return
@@ -143,7 +143,7 @@ func RegisterTraceServiceHandlerClient(ctx context.Context, mux *runtime.ServeMu
 		inboundMarshaler, outboundMarshaler := runtime.MarshalerForRequest(mux, req)
 		var err error
 		var annotatedContext context.Context
-		annotatedContext, err = runtime.AnnotateContext(ctx, mux, req, "/opentelemetry.proto.collector.trace.v1.TraceService/Export", runtime.WithHTTPPathPattern("/v1/trace"))
+		annotatedContext, err = runtime.AnnotateContext(ctx, mux, req, "/opentelemetry.proto.collector.trace.v1.TraceService/Export", runtime.WithHTTPPathPattern("/v1/traces"))
 		if err != nil {
 			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
 			return
@@ -163,7 +163,7 @@ func RegisterTraceServiceHandlerClient(ctx context.Context, mux *runtime.ServeMu
 }
 
 var (
-	pattern_TraceService_Export_0 = runtime.MustPattern(runtime.NewPattern(1, []int{2, 0, 2, 1}, []string{"v1", "trace"}, ""))
+	pattern_TraceService_Export_0 = runtime.MustPattern(runtime.NewPattern(1, []int{2, 0, 2, 1}, []string{"v1", "traces"}, ""))
 )
 
 var (
diff --git a/otlp/common/v1/common.pb.go b/otlp/common/v1/common.pb.go
index 645cd62..852209b 100644
--- a/otlp/common/v1/common.pb.go
+++ b/otlp/common/v1/common.pb.go
@@ -361,8 +361,11 @@ type InstrumentationScope struct {
 	unknownFields protoimpl.UnknownFields
 
 	// An empty instrumentation scope name means the name is unknown.
-	Name                   string      `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
-	Version                string      `protobuf:"bytes,2,opt,name=version,proto3" json:"version,omitempty"`
+	Name    string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
+	Version string `protobuf:"bytes,2,opt,name=version,proto3" json:"version,omitempty"`
+	// Additional attributes that describe the scope. [Optional].
+	// Attribute keys MUST be unique (it is not allowed to have more than one
+	// attribute with the same key).
 	Attributes             []*KeyValue `protobuf:"bytes,3,rep,name=attributes,proto3" json:"attributes,omitempty"`
 	DroppedAttributesCount uint32      `protobuf:"varint,4,opt,name=dropped_attributes_count,json=droppedAttributesCount,proto3" json:"dropped_attributes_count,omitempty"`
 }
diff --git a/otlp/logs/v1/logs.pb.go b/otlp/logs/v1/logs.pb.go
index 43f188e..5314b4e 100644
--- a/otlp/logs/v1/logs.pb.go
+++ b/otlp/logs/v1/logs.pb.go
@@ -153,23 +153,31 @@ func (SeverityNumber) EnumDescriptor() ([]byte, []int) {
 	return file_opentelemetry_proto_logs_v1_logs_proto_rawDescGZIP(), []int{0}
 }
 
-// Masks for LogRecord.flags field.
+// LogRecordFlags is defined as a protobuf 'uint32' type and is to be used as
+// bit-fields. Each non-zero value defined in this enum is a bit-mask.
+// To extract the bit-field, for example, use an expression like:
+//
+//   (logRecord.flags & LOG_RECORD_FLAGS_TRACE_FLAGS_MASK)
+//
 type LogRecordFlags int32
 
 const (
-	LogRecordFlags_LOG_RECORD_FLAG_UNSPECIFIED      LogRecordFlags = 0
-	LogRecordFlags_LOG_RECORD_FLAG_TRACE_FLAGS_MASK LogRecordFlags = 255
+	// The zero value for the enum. Should not be used for comparisons.
+	// Instead use bitwise "and" with the appropriate mask as shown above.
+	LogRecordFlags_LOG_RECORD_FLAGS_DO_NOT_USE LogRecordFlags = 0
+	// Bits 0-7 are used for trace flags.
+	LogRecordFlags_LOG_RECORD_FLAGS_TRACE_FLAGS_MASK LogRecordFlags = 255
 )
 
 // Enum value maps for LogRecordFlags.
 var (
 	LogRecordFlags_name = map[int32]string{
-		0:   "LOG_RECORD_FLAG_UNSPECIFIED",
-		255: "LOG_RECORD_FLAG_TRACE_FLAGS_MASK",
+		0:   "LOG_RECORD_FLAGS_DO_NOT_USE",
+		255: "LOG_RECORD_FLAGS_TRACE_FLAGS_MASK",
 	}
 	LogRecordFlags_value = map[string]int32{
-		"LOG_RECORD_FLAG_UNSPECIFIED":      0,
-		"LOG_RECORD_FLAG_TRACE_FLAGS_MASK": 255,
+		"LOG_RECORD_FLAGS_DO_NOT_USE":       0,
+		"LOG_RECORD_FLAGS_TRACE_FLAGS_MASK": 255,
 	}
 )
 
@@ -446,17 +454,32 @@ type LogRecord struct {
 	// defined in W3C Trace Context specification. 24 most significant bits are reserved
 	// and must be set to 0. Readers must not assume that 24 most significant bits
 	// will be zero and must correctly mask the bits when reading 8-bit trace flag (use
-	// flags & TRACE_FLAGS_MASK). [Optional].
+	// flags & LOG_RECORD_FLAGS_TRACE_FLAGS_MASK). [Optional].
 	Flags uint32 `protobuf:"fixed32,8,opt,name=flags,proto3" json:"flags,omitempty"`
 	// A unique identifier for a trace. All logs from the same trace share
-	// the same `trace_id`. The ID is a 16-byte array. An ID with all zeroes
-	// is considered invalid. Can be set for logs that are part of request processing
-	// and have an assigned trace id. [Optional].
+	// the same `trace_id`. The ID is a 16-byte array. An ID with all zeroes OR
+	// of length other than 16 bytes is considered invalid (empty string in OTLP/JSON
+	// is zero-length and thus is also invalid).
+	//
+	// This field is optional.
+	//
+	// The receivers SHOULD assume that the log record is not associated with a
+	// trace if any of the following is true:
+	//   - the field is not present,
+	//   - the field contains an invalid value.
 	TraceId []byte `protobuf:"bytes,9,opt,name=trace_id,json=traceId,proto3" json:"trace_id,omitempty"`
 	// A unique identifier for a span within a trace, assigned when the span
-	// is created. The ID is an 8-byte array. An ID with all zeroes is considered
-	// invalid. Can be set for logs that are part of a particular processing span.
-	// If span_id is present trace_id SHOULD be also present. [Optional].
+	// is created. The ID is an 8-byte array. An ID with all zeroes OR of length
+	// other than 8 bytes is considered invalid (empty string in OTLP/JSON
+	// is zero-length and thus is also invalid).
+	//
+	// This field is optional. If the sender specifies a valid span_id then it SHOULD also
+	// specify a valid trace_id.
+	//
+	// The receivers SHOULD assume that the log record is not associated with a
+	// span if any of the following is true:
+	//   - the field is not present,
+	//   - the field contains an invalid value.
 	SpanId []byte `protobuf:"bytes,10,opt,name=span_id,json=spanId,proto3" json:"span_id,omitempty"`
 }
 
@@ -681,20 +704,20 @@ var file_opentelemetry_proto_logs_v1_logs_proto_rawDesc = []byte{
 	0x52, 0x49, 0x54, 0x59, 0x5f, 0x4e, 0x55, 0x4d, 0x42, 0x45, 0x52, 0x5f, 0x46, 0x41, 0x54, 0x41,
 	0x4c, 0x33, 0x10, 0x17, 0x12, 0x1a, 0x0a, 0x16, 0x53, 0x45, 0x56, 0x45, 0x52, 0x49, 0x54, 0x59,
 	0x5f, 0x4e, 0x55, 0x4d, 0x42, 0x45, 0x52, 0x5f, 0x46, 0x41, 0x54, 0x41, 0x4c, 0x34, 0x10, 0x18,
-	0x2a, 0x58, 0x0a, 0x0e, 0x4c, 0x6f, 0x67, 0x52, 0x65, 0x63, 0x6f, 0x72, 0x64, 0x46, 0x6c, 0x61,
+	0x2a, 0x59, 0x0a, 0x0e, 0x4c, 0x6f, 0x67, 0x52, 0x65, 0x63, 0x6f, 0x72, 0x64, 0x46, 0x6c, 0x61,
 	0x67, 0x73, 0x12, 0x1f, 0x0a, 0x1b, 0x4c, 0x4f, 0x47, 0x5f, 0x52, 0x45, 0x43, 0x4f, 0x52, 0x44,
-	0x5f, 0x46, 0x4c, 0x41, 0x47, 0x5f, 0x55, 0x4e, 0x53, 0x50, 0x45, 0x43, 0x49, 0x46, 0x49, 0x45,
-	0x44, 0x10, 0x00, 0x12, 0x25, 0x0a, 0x20, 0x4c, 0x4f, 0x47, 0x5f, 0x52, 0x45, 0x43, 0x4f, 0x52,
-	0x44, 0x5f, 0x46, 0x4c, 0x41, 0x47, 0x5f, 0x54, 0x52, 0x41, 0x43, 0x45, 0x5f, 0x46, 0x4c, 0x41,
-	0x47, 0x53, 0x5f, 0x4d, 0x41, 0x53, 0x4b, 0x10, 0xff, 0x01, 0x42, 0x73, 0x0a, 0x1e, 0x69, 0x6f,
-	0x2e, 0x6f, 0x70, 0x65, 0x6e, 0x74, 0x65, 0x6c, 0x65, 0x6d, 0x65, 0x74, 0x72, 0x79, 0x2e, 0x70,
-	0x72, 0x6f, 0x74, 0x6f, 0x2e, 0x6c, 0x6f, 0x67, 0x73, 0x2e, 0x76, 0x31, 0x42, 0x09, 0x4c, 0x6f,
-	0x67, 0x73, 0x50, 0x72, 0x6f, 0x74, 0x6f, 0x50, 0x01, 0x5a, 0x26, 0x67, 0x6f, 0x2e, 0x6f, 0x70,
-	0x65, 0x6e, 0x74, 0x65, 0x6c, 0x65, 0x6d, 0x65, 0x74, 0x72, 0x79, 0x2e, 0x69, 0x6f, 0x2f, 0x70,
-	0x72, 0x6f, 0x74, 0x6f, 0x2f, 0x6f, 0x74, 0x6c, 0x70, 0x2f, 0x6c, 0x6f, 0x67, 0x73, 0x2f, 0x76,
-	0x31, 0xaa, 0x02, 0x1b, 0x4f, 0x70, 0x65, 0x6e, 0x54, 0x65, 0x6c, 0x65, 0x6d, 0x65, 0x74, 0x72,
-	0x79, 0x2e, 0x50, 0x72, 0x6f, 0x74, 0x6f, 0x2e, 0x4c, 0x6f, 0x67, 0x73, 0x2e, 0x56, 0x31, 0x62,
-	0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+	0x5f, 0x46, 0x4c, 0x41, 0x47, 0x53, 0x5f, 0x44, 0x4f, 0x5f, 0x4e, 0x4f, 0x54, 0x5f, 0x55, 0x53,
+	0x45, 0x10, 0x00, 0x12, 0x26, 0x0a, 0x21, 0x4c, 0x4f, 0x47, 0x5f, 0x52, 0x45, 0x43, 0x4f, 0x52,
+	0x44, 0x5f, 0x46, 0x4c, 0x41, 0x47, 0x53, 0x5f, 0x54, 0x52, 0x41, 0x43, 0x45, 0x5f, 0x46, 0x4c,
+	0x41, 0x47, 0x53, 0x5f, 0x4d, 0x41, 0x53, 0x4b, 0x10, 0xff, 0x01, 0x42, 0x73, 0x0a, 0x1e, 0x69,
+	0x6f, 0x2e, 0x6f, 0x70, 0x65, 0x6e, 0x74, 0x65, 0x6c, 0x65, 0x6d, 0x65, 0x74, 0x72, 0x79, 0x2e,
+	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2e, 0x6c, 0x6f, 0x67, 0x73, 0x2e, 0x76, 0x31, 0x42, 0x09, 0x4c,
+	0x6f, 0x67, 0x73, 0x50, 0x72, 0x6f, 0x74, 0x6f, 0x50, 0x01, 0x5a, 0x26, 0x67, 0x6f, 0x2e, 0x6f,
+	0x70, 0x65, 0x6e, 0x74, 0x65, 0x6c, 0x65, 0x6d, 0x65, 0x74, 0x72, 0x79, 0x2e, 0x69, 0x6f, 0x2f,
+	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2f, 0x6f, 0x74, 0x6c, 0x70, 0x2f, 0x6c, 0x6f, 0x67, 0x73, 0x2f,
+	0x76, 0x31, 0xaa, 0x02, 0x1b, 0x4f, 0x70, 0x65, 0x6e, 0x54, 0x65, 0x6c, 0x65, 0x6d, 0x65, 0x74,
+	0x72, 0x79, 0x2e, 0x50, 0x72, 0x6f, 0x74, 0x6f, 0x2e, 0x4c, 0x6f, 0x67, 0x73, 0x2e, 0x56, 0x31,
+	0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
diff --git a/otlp/metrics/v1/metrics.pb.go b/otlp/metrics/v1/metrics.pb.go
index 4a68113..dfa59a6 100644
--- a/otlp/metrics/v1/metrics.pb.go
+++ b/otlp/metrics/v1/metrics.pb.go
@@ -153,27 +153,29 @@ func (AggregationTemporality) EnumDescriptor() ([]byte, []int) {
 // enum is a bit-mask.  To test the presence of a single flag in the flags of
 // a data point, for example, use an expression like:
 //
-//   (point.flags & FLAG_NO_RECORDED_VALUE) == FLAG_NO_RECORDED_VALUE
+//   (point.flags & DATA_POINT_FLAGS_NO_RECORDED_VALUE_MASK) == DATA_POINT_FLAGS_NO_RECORDED_VALUE_MASK
 //
 type DataPointFlags int32
 
 const (
-	DataPointFlags_FLAG_NONE DataPointFlags = 0
+	// The zero value for the enum. Should not be used for comparisons.
+	// Instead use bitwise "and" with the appropriate mask as shown above.
+	DataPointFlags_DATA_POINT_FLAGS_DO_NOT_USE DataPointFlags = 0
 	// This DataPoint is valid but has no recorded value.  This value
 	// SHOULD be used to reflect explicitly missing data in a series, as
 	// for an equivalent to the Prometheus "staleness marker".
-	DataPointFlags_FLAG_NO_RECORDED_VALUE DataPointFlags = 1
+	DataPointFlags_DATA_POINT_FLAGS_NO_RECORDED_VALUE_MASK DataPointFlags = 1
 )
 
 // Enum value maps for DataPointFlags.
 var (
 	DataPointFlags_name = map[int32]string{
-		0: "FLAG_NONE",
-		1: "FLAG_NO_RECORDED_VALUE",
+		0: "DATA_POINT_FLAGS_DO_NOT_USE",
+		1: "DATA_POINT_FLAGS_NO_RECORDED_VALUE_MASK",
 	}
 	DataPointFlags_value = map[string]int32{
-		"FLAG_NONE":              0,
-		"FLAG_NO_RECORDED_VALUE": 1,
+		"DATA_POINT_FLAGS_DO_NOT_USE":             0,
+		"DATA_POINT_FLAGS_NO_RECORDED_VALUE_MASK": 1,
 	}
 )
 
@@ -1312,8 +1314,8 @@ type ExponentialHistogramDataPoint struct {
 	//   base = (2^(2^-scale))
 	//
 	// The histogram bucket identified by `index`, a signed integer,
-	// contains values that are greater than or equal to (base^index) and
-	// less than (base^(index+1)).
+	// contains values that are greater than (base^index) and
+	// less than or equal to (base^(index+1)).
 	//
 	// The positive and negative ranges of the histogram are expressed
 	// separately.  Negative values are mapped by their absolute value
@@ -1345,6 +1347,13 @@ type ExponentialHistogramDataPoint struct {
 	Min *float64 `protobuf:"fixed64,12,opt,name=min,proto3,oneof" json:"min,omitempty"`
 	// max is the maximum value over (start_time, end_time].
 	Max *float64 `protobuf:"fixed64,13,opt,name=max,proto3,oneof" json:"max,omitempty"`
+	// ZeroThreshold may be optionally set to convey the width of the zero
+	// region. Where the zero region is defined as the closed interval
+	// [-ZeroThreshold, ZeroThreshold].
+	// When ZeroThreshold is 0, zero count bucket stores values that cannot be
+	// expressed using the standard exponential formula as well as values that
+	// have been rounded to zero.
+	ZeroThreshold float64 `protobuf:"fixed64,14,opt,name=zero_threshold,json=zeroThreshold,proto3" json:"zero_threshold,omitempty"`
 }
 
 func (x *ExponentialHistogramDataPoint) Reset() {
@@ -1470,6 +1479,13 @@ func (x *ExponentialHistogramDataPoint) GetMax() float64 {
 	return 0
 }
 
+func (x *ExponentialHistogramDataPoint) GetZeroThreshold() float64 {
+	if x != nil {
+		return x.ZeroThreshold
+	}
+	return 0
+}
+
 // SummaryDataPoint is a single data point in a timeseries that describes the
 // time-varying values of a Summary metric.
 type SummaryDataPoint struct {
@@ -1737,9 +1753,9 @@ type ExponentialHistogramDataPoint_Buckets struct {
 	//
 	// Note: This uses a varint encoding as a simple form of compression.
 	Offset int32 `protobuf:"zigzag32,1,opt,name=offset,proto3" json:"offset,omitempty"`
-	// Count is an array of counts, where count[i] carries the count
-	// of the bucket at index (offset+i).  count[i] is the count of
-	// values greater than or equal to base^(offset+i) and less than
+	// bucket_counts is an array of count values, where bucket_counts[i] carries
+	// the count of the bucket at index (offset+i). bucket_counts[i] is the count
+	// of values greater than base^(offset+i) and less than or equal to
 	// base^(offset+i+1).
 	//
 	// Note: By contrast, the explicit HistogramDataPoint uses
@@ -2044,7 +2060,7 @@ var file_opentelemetry_proto_metrics_v1_metrics_proto_rawDesc = []byte{
 	0x12, 0x15, 0x0a, 0x03, 0x6d, 0x61, 0x78, 0x18, 0x0c, 0x20, 0x01, 0x28, 0x01, 0x48, 0x02, 0x52,
 	0x03, 0x6d, 0x61, 0x78, 0x88, 0x01, 0x01, 0x42, 0x06, 0x0a, 0x04, 0x5f, 0x73, 0x75, 0x6d, 0x42,
 	0x06, 0x0a, 0x04, 0x5f, 0x6d, 0x69, 0x6e, 0x42, 0x06, 0x0a, 0x04, 0x5f, 0x6d, 0x61, 0x78, 0x4a,
-	0x04, 0x08, 0x01, 0x10, 0x02, 0x22, 0xd3, 0x05, 0x0a, 0x1d, 0x45, 0x78, 0x70, 0x6f, 0x6e, 0x65,
+	0x04, 0x08, 0x01, 0x10, 0x02, 0x22, 0xfa, 0x05, 0x0a, 0x1d, 0x45, 0x78, 0x70, 0x6f, 0x6e, 0x65,
 	0x6e, 0x74, 0x69, 0x61, 0x6c, 0x48, 0x69, 0x73, 0x74, 0x6f, 0x67, 0x72, 0x61, 0x6d, 0x44, 0x61,
 	0x74, 0x61, 0x50, 0x6f, 0x69, 0x6e, 0x74, 0x12, 0x47, 0x0a, 0x0a, 0x61, 0x74, 0x74, 0x72, 0x69,
 	0x62, 0x75, 0x74, 0x65, 0x73, 0x18, 0x01, 0x20, 0x03, 0x28, 0x0b, 0x32, 0x27, 0x2e, 0x6f, 0x70,
@@ -2083,78 +2099,82 @@ var file_opentelemetry_proto_metrics_v1_metrics_proto_rawDesc = []byte{
 	0x61, 0x72, 0x52, 0x09, 0x65, 0x78, 0x65, 0x6d, 0x70, 0x6c, 0x61, 0x72, 0x73, 0x12, 0x15, 0x0a,
 	0x03, 0x6d, 0x69, 0x6e, 0x18, 0x0c, 0x20, 0x01, 0x28, 0x01, 0x48, 0x01, 0x52, 0x03, 0x6d, 0x69,
 	0x6e, 0x88, 0x01, 0x01, 0x12, 0x15, 0x0a, 0x03, 0x6d, 0x61, 0x78, 0x18, 0x0d, 0x20, 0x01, 0x28,
-	0x01, 0x48, 0x02, 0x52, 0x03, 0x6d, 0x61, 0x78, 0x88, 0x01, 0x01, 0x1a, 0x46, 0x0a, 0x07, 0x42,
-	0x75, 0x63, 0x6b, 0x65, 0x74, 0x73, 0x12, 0x16, 0x0a, 0x06, 0x6f, 0x66, 0x66, 0x73, 0x65, 0x74,
-	0x18, 0x01, 0x20, 0x01, 0x28, 0x11, 0x52, 0x06, 0x6f, 0x66, 0x66, 0x73, 0x65, 0x74, 0x12, 0x23,
-	0x0a, 0x0d, 0x62, 0x75, 0x63, 0x6b, 0x65, 0x74, 0x5f, 0x63, 0x6f, 0x75, 0x6e, 0x74, 0x73, 0x18,
-	0x02, 0x20, 0x03, 0x28, 0x04, 0x52, 0x0c, 0x62, 0x75, 0x63, 0x6b, 0x65, 0x74, 0x43, 0x6f, 0x75,
-	0x6e, 0x74, 0x73, 0x42, 0x06, 0x0a, 0x04, 0x5f, 0x73, 0x75, 0x6d, 0x42, 0x06, 0x0a, 0x04, 0x5f,
-	0x6d, 0x69, 0x6e, 0x42, 0x06, 0x0a, 0x04, 0x5f, 0x6d, 0x61, 0x78, 0x22, 0xa6, 0x03, 0x0a, 0x10,
-	0x53, 0x75, 0x6d, 0x6d, 0x61, 0x72, 0x79, 0x44, 0x61, 0x74, 0x61, 0x50, 0x6f, 0x69, 0x6e, 0x74,
-	0x12, 0x47, 0x0a, 0x0a, 0x61, 0x74, 0x74, 0x72, 0x69, 0x62, 0x75, 0x74, 0x65, 0x73, 0x18, 0x07,
-	0x20, 0x03, 0x28, 0x0b, 0x32, 0x27, 0x2e, 0x6f, 0x70, 0x65, 0x6e, 0x74, 0x65, 0x6c, 0x65, 0x6d,
-	0x65, 0x74, 0x72, 0x79, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2e, 0x63, 0x6f, 0x6d, 0x6d, 0x6f,
-	0x6e, 0x2e, 0x76, 0x31, 0x2e, 0x4b, 0x65, 0x79, 0x56, 0x61, 0x6c, 0x75, 0x65, 0x52, 0x0a, 0x61,
-	0x74, 0x74, 0x72, 0x69, 0x62, 0x75, 0x74, 0x65, 0x73, 0x12, 0x2f, 0x0a, 0x14, 0x73, 0x74, 0x61,
-	0x72, 0x74, 0x5f, 0x74, 0x69, 0x6d, 0x65, 0x5f, 0x75, 0x6e, 0x69, 0x78, 0x5f, 0x6e, 0x61, 0x6e,
-	0x6f, 0x18, 0x02, 0x20, 0x01, 0x28, 0x06, 0x52, 0x11, 0x73, 0x74, 0x61, 0x72, 0x74, 0x54, 0x69,
-	0x6d, 0x65, 0x55, 0x6e, 0x69, 0x78, 0x4e, 0x61, 0x6e, 0x6f, 0x12, 0x24, 0x0a, 0x0e, 0x74, 0x69,
-	0x6d, 0x65, 0x5f, 0x75, 0x6e, 0x69, 0x78, 0x5f, 0x6e, 0x61, 0x6e, 0x6f, 0x18, 0x03, 0x20, 0x01,
-	0x28, 0x06, 0x52, 0x0c, 0x74, 0x69, 0x6d, 0x65, 0x55, 0x6e, 0x69, 0x78, 0x4e, 0x61, 0x6e, 0x6f,
-	0x12, 0x14, 0x0a, 0x05, 0x63, 0x6f, 0x75, 0x6e, 0x74, 0x18, 0x04, 0x20, 0x01, 0x28, 0x06, 0x52,
-	0x05, 0x63, 0x6f, 0x75, 0x6e, 0x74, 0x12, 0x10, 0x0a, 0x03, 0x73, 0x75, 0x6d, 0x18, 0x05, 0x20,
-	0x01, 0x28, 0x01, 0x52, 0x03, 0x73, 0x75, 0x6d, 0x12, 0x69, 0x0a, 0x0f, 0x71, 0x75, 0x61, 0x6e,
-	0x74, 0x69, 0x6c, 0x65, 0x5f, 0x76, 0x61, 0x6c, 0x75, 0x65, 0x73, 0x18, 0x06, 0x20, 0x03, 0x28,
-	0x0b, 0x32, 0x40, 0x2e, 0x6f, 0x70, 0x65, 0x6e, 0x74, 0x65, 0x6c, 0x65, 0x6d, 0x65, 0x74, 0x72,
-	0x79, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2e, 0x6d, 0x65, 0x74, 0x72, 0x69, 0x63, 0x73, 0x2e,
-	0x76, 0x31, 0x2e, 0x53, 0x75, 0x6d, 0x6d, 0x61, 0x72, 0x79, 0x44, 0x61, 0x74, 0x61, 0x50, 0x6f,
-	0x69, 0x6e, 0x74, 0x2e, 0x56, 0x61, 0x6c, 0x75, 0x65, 0x41, 0x74, 0x51, 0x75, 0x61, 0x6e, 0x74,
-	0x69, 0x6c, 0x65, 0x52, 0x0e, 0x71, 0x75, 0x61, 0x6e, 0x74, 0x69, 0x6c, 0x65, 0x56, 0x61, 0x6c,
-	0x75, 0x65, 0x73, 0x12, 0x14, 0x0a, 0x05, 0x66, 0x6c, 0x61, 0x67, 0x73, 0x18, 0x08, 0x20, 0x01,
-	0x28, 0x0d, 0x52, 0x05, 0x66, 0x6c, 0x61, 0x67, 0x73, 0x1a, 0x43, 0x0a, 0x0f, 0x56, 0x61, 0x6c,
-	0x75, 0x65, 0x41, 0x74, 0x51, 0x75, 0x61, 0x6e, 0x74, 0x69, 0x6c, 0x65, 0x12, 0x1a, 0x0a, 0x08,
-	0x71, 0x75, 0x61, 0x6e, 0x74, 0x69, 0x6c, 0x65, 0x18, 0x01, 0x20, 0x01, 0x28, 0x01, 0x52, 0x08,
-	0x71, 0x75, 0x61, 0x6e, 0x74, 0x69, 0x6c, 0x65, 0x12, 0x14, 0x0a, 0x05, 0x76, 0x61, 0x6c, 0x75,
-	0x65, 0x18, 0x02, 0x20, 0x01, 0x28, 0x01, 0x52, 0x05, 0x76, 0x61, 0x6c, 0x75, 0x65, 0x4a, 0x04,
-	0x08, 0x01, 0x10, 0x02, 0x22, 0x85, 0x02, 0x0a, 0x08, 0x45, 0x78, 0x65, 0x6d, 0x70, 0x6c, 0x61,
-	0x72, 0x12, 0x58, 0x0a, 0x13, 0x66, 0x69, 0x6c, 0x74, 0x65, 0x72, 0x65, 0x64, 0x5f, 0x61, 0x74,
-	0x74, 0x72, 0x69, 0x62, 0x75, 0x74, 0x65, 0x73, 0x18, 0x07, 0x20, 0x03, 0x28, 0x0b, 0x32, 0x27,
-	0x2e, 0x6f, 0x70, 0x65, 0x6e, 0x74, 0x65, 0x6c, 0x65, 0x6d, 0x65, 0x74, 0x72, 0x79, 0x2e, 0x70,
-	0x72, 0x6f, 0x74, 0x6f, 0x2e, 0x63, 0x6f, 0x6d, 0x6d, 0x6f, 0x6e, 0x2e, 0x76, 0x31, 0x2e, 0x4b,
-	0x65, 0x79, 0x56, 0x61, 0x6c, 0x75, 0x65, 0x52, 0x12, 0x66, 0x69, 0x6c, 0x74, 0x65, 0x72, 0x65,
-	0x64, 0x41, 0x74, 0x74, 0x72, 0x69, 0x62, 0x75, 0x74, 0x65, 0x73, 0x12, 0x24, 0x0a, 0x0e, 0x74,
-	0x69, 0x6d, 0x65, 0x5f, 0x75, 0x6e, 0x69, 0x78, 0x5f, 0x6e, 0x61, 0x6e, 0x6f, 0x18, 0x02, 0x20,
-	0x01, 0x28, 0x06, 0x52, 0x0c, 0x74, 0x69, 0x6d, 0x65, 0x55, 0x6e, 0x69, 0x78, 0x4e, 0x61, 0x6e,
-	0x6f, 0x12, 0x1d, 0x0a, 0x09, 0x61, 0x73, 0x5f, 0x64, 0x6f, 0x75, 0x62, 0x6c, 0x65, 0x18, 0x03,
-	0x20, 0x01, 0x28, 0x01, 0x48, 0x00, 0x52, 0x08, 0x61, 0x73, 0x44, 0x6f, 0x75, 0x62, 0x6c, 0x65,
-	0x12, 0x17, 0x0a, 0x06, 0x61, 0x73, 0x5f, 0x69, 0x6e, 0x74, 0x18, 0x06, 0x20, 0x01, 0x28, 0x10,
-	0x48, 0x00, 0x52, 0x05, 0x61, 0x73, 0x49, 0x6e, 0x74, 0x12, 0x17, 0x0a, 0x07, 0x73, 0x70, 0x61,
-	0x6e, 0x5f, 0x69, 0x64, 0x18, 0x04, 0x20, 0x01, 0x28, 0x0c, 0x52, 0x06, 0x73, 0x70, 0x61, 0x6e,
-	0x49, 0x64, 0x12, 0x19, 0x0a, 0x08, 0x74, 0x72, 0x61, 0x63, 0x65, 0x5f, 0x69, 0x64, 0x18, 0x05,
-	0x20, 0x01, 0x28, 0x0c, 0x52, 0x07, 0x74, 0x72, 0x61, 0x63, 0x65, 0x49, 0x64, 0x42, 0x07, 0x0a,
-	0x05, 0x76, 0x61, 0x6c, 0x75, 0x65, 0x4a, 0x04, 0x08, 0x01, 0x10, 0x02, 0x2a, 0x8c, 0x01, 0x0a,
-	0x16, 0x41, 0x67, 0x67, 0x72, 0x65, 0x67, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x54, 0x65, 0x6d, 0x70,
-	0x6f, 0x72, 0x61, 0x6c, 0x69, 0x74, 0x79, 0x12, 0x27, 0x0a, 0x23, 0x41, 0x47, 0x47, 0x52, 0x45,
+	0x01, 0x48, 0x02, 0x52, 0x03, 0x6d, 0x61, 0x78, 0x88, 0x01, 0x01, 0x12, 0x25, 0x0a, 0x0e, 0x7a,
+	0x65, 0x72, 0x6f, 0x5f, 0x74, 0x68, 0x72, 0x65, 0x73, 0x68, 0x6f, 0x6c, 0x64, 0x18, 0x0e, 0x20,
+	0x01, 0x28, 0x01, 0x52, 0x0d, 0x7a, 0x65, 0x72, 0x6f, 0x54, 0x68, 0x72, 0x65, 0x73, 0x68, 0x6f,
+	0x6c, 0x64, 0x1a, 0x46, 0x0a, 0x07, 0x42, 0x75, 0x63, 0x6b, 0x65, 0x74, 0x73, 0x12, 0x16, 0x0a,
+	0x06, 0x6f, 0x66, 0x66, 0x73, 0x65, 0x74, 0x18, 0x01, 0x20, 0x01, 0x28, 0x11, 0x52, 0x06, 0x6f,
+	0x66, 0x66, 0x73, 0x65, 0x74, 0x12, 0x23, 0x0a, 0x0d, 0x62, 0x75, 0x63, 0x6b, 0x65, 0x74, 0x5f,
+	0x63, 0x6f, 0x75, 0x6e, 0x74, 0x73, 0x18, 0x02, 0x20, 0x03, 0x28, 0x04, 0x52, 0x0c, 0x62, 0x75,
+	0x63, 0x6b, 0x65, 0x74, 0x43, 0x6f, 0x75, 0x6e, 0x74, 0x73, 0x42, 0x06, 0x0a, 0x04, 0x5f, 0x73,
+	0x75, 0x6d, 0x42, 0x06, 0x0a, 0x04, 0x5f, 0x6d, 0x69, 0x6e, 0x42, 0x06, 0x0a, 0x04, 0x5f, 0x6d,
+	0x61, 0x78, 0x22, 0xa6, 0x03, 0x0a, 0x10, 0x53, 0x75, 0x6d, 0x6d, 0x61, 0x72, 0x79, 0x44, 0x61,
+	0x74, 0x61, 0x50, 0x6f, 0x69, 0x6e, 0x74, 0x12, 0x47, 0x0a, 0x0a, 0x61, 0x74, 0x74, 0x72, 0x69,
+	0x62, 0x75, 0x74, 0x65, 0x73, 0x18, 0x07, 0x20, 0x03, 0x28, 0x0b, 0x32, 0x27, 0x2e, 0x6f, 0x70,
+	0x65, 0x6e, 0x74, 0x65, 0x6c, 0x65, 0x6d, 0x65, 0x74, 0x72, 0x79, 0x2e, 0x70, 0x72, 0x6f, 0x74,
+	0x6f, 0x2e, 0x63, 0x6f, 0x6d, 0x6d, 0x6f, 0x6e, 0x2e, 0x76, 0x31, 0x2e, 0x4b, 0x65, 0x79, 0x56,
+	0x61, 0x6c, 0x75, 0x65, 0x52, 0x0a, 0x61, 0x74, 0x74, 0x72, 0x69, 0x62, 0x75, 0x74, 0x65, 0x73,
+	0x12, 0x2f, 0x0a, 0x14, 0x73, 0x74, 0x61, 0x72, 0x74, 0x5f, 0x74, 0x69, 0x6d, 0x65, 0x5f, 0x75,
+	0x6e, 0x69, 0x78, 0x5f, 0x6e, 0x61, 0x6e, 0x6f, 0x18, 0x02, 0x20, 0x01, 0x28, 0x06, 0x52, 0x11,
+	0x73, 0x74, 0x61, 0x72, 0x74, 0x54, 0x69, 0x6d, 0x65, 0x55, 0x6e, 0x69, 0x78, 0x4e, 0x61, 0x6e,
+	0x6f, 0x12, 0x24, 0x0a, 0x0e, 0x74, 0x69, 0x6d, 0x65, 0x5f, 0x75, 0x6e, 0x69, 0x78, 0x5f, 0x6e,
+	0x61, 0x6e, 0x6f, 0x18, 0x03, 0x20, 0x01, 0x28, 0x06, 0x52, 0x0c, 0x74, 0x69, 0x6d, 0x65, 0x55,
+	0x6e, 0x69, 0x78, 0x4e, 0x61, 0x6e, 0x6f, 0x12, 0x14, 0x0a, 0x05, 0x63, 0x6f, 0x75, 0x6e, 0x74,
+	0x18, 0x04, 0x20, 0x01, 0x28, 0x06, 0x52, 0x05, 0x63, 0x6f, 0x75, 0x6e, 0x74, 0x12, 0x10, 0x0a,
+	0x03, 0x73, 0x75, 0x6d, 0x18, 0x05, 0x20, 0x01, 0x28, 0x01, 0x52, 0x03, 0x73, 0x75, 0x6d, 0x12,
+	0x69, 0x0a, 0x0f, 0x71, 0x75, 0x61, 0x6e, 0x74, 0x69, 0x6c, 0x65, 0x5f, 0x76, 0x61, 0x6c, 0x75,
+	0x65, 0x73, 0x18, 0x06, 0x20, 0x03, 0x28, 0x0b, 0x32, 0x40, 0x2e, 0x6f, 0x70, 0x65, 0x6e, 0x74,
+	0x65, 0x6c, 0x65, 0x6d, 0x65, 0x74, 0x72, 0x79, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2e, 0x6d,
+	0x65, 0x74, 0x72, 0x69, 0x63, 0x73, 0x2e, 0x76, 0x31, 0x2e, 0x53, 0x75, 0x6d, 0x6d, 0x61, 0x72,
+	0x79, 0x44, 0x61, 0x74, 0x61, 0x50, 0x6f, 0x69, 0x6e, 0x74, 0x2e, 0x56, 0x61, 0x6c, 0x75, 0x65,
+	0x41, 0x74, 0x51, 0x75, 0x61, 0x6e, 0x74, 0x69, 0x6c, 0x65, 0x52, 0x0e, 0x71, 0x75, 0x61, 0x6e,
+	0x74, 0x69, 0x6c, 0x65, 0x56, 0x61, 0x6c, 0x75, 0x65, 0x73, 0x12, 0x14, 0x0a, 0x05, 0x66, 0x6c,
+	0x61, 0x67, 0x73, 0x18, 0x08, 0x20, 0x01, 0x28, 0x0d, 0x52, 0x05, 0x66, 0x6c, 0x61, 0x67, 0x73,
+	0x1a, 0x43, 0x0a, 0x0f, 0x56, 0x61, 0x6c, 0x75, 0x65, 0x41, 0x74, 0x51, 0x75, 0x61, 0x6e, 0x74,
+	0x69, 0x6c, 0x65, 0x12, 0x1a, 0x0a, 0x08, 0x71, 0x75, 0x61, 0x6e, 0x74, 0x69, 0x6c, 0x65, 0x18,
+	0x01, 0x20, 0x01, 0x28, 0x01, 0x52, 0x08, 0x71, 0x75, 0x61, 0x6e, 0x74, 0x69, 0x6c, 0x65, 0x12,
+	0x14, 0x0a, 0x05, 0x76, 0x61, 0x6c, 0x75, 0x65, 0x18, 0x02, 0x20, 0x01, 0x28, 0x01, 0x52, 0x05,
+	0x76, 0x61, 0x6c, 0x75, 0x65, 0x4a, 0x04, 0x08, 0x01, 0x10, 0x02, 0x22, 0x85, 0x02, 0x0a, 0x08,
+	0x45, 0x78, 0x65, 0x6d, 0x70, 0x6c, 0x61, 0x72, 0x12, 0x58, 0x0a, 0x13, 0x66, 0x69, 0x6c, 0x74,
+	0x65, 0x72, 0x65, 0x64, 0x5f, 0x61, 0x74, 0x74, 0x72, 0x69, 0x62, 0x75, 0x74, 0x65, 0x73, 0x18,
+	0x07, 0x20, 0x03, 0x28, 0x0b, 0x32, 0x27, 0x2e, 0x6f, 0x70, 0x65, 0x6e, 0x74, 0x65, 0x6c, 0x65,
+	0x6d, 0x65, 0x74, 0x72, 0x79, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2e, 0x63, 0x6f, 0x6d, 0x6d,
+	0x6f, 0x6e, 0x2e, 0x76, 0x31, 0x2e, 0x4b, 0x65, 0x79, 0x56, 0x61, 0x6c, 0x75, 0x65, 0x52, 0x12,
+	0x66, 0x69, 0x6c, 0x74, 0x65, 0x72, 0x65, 0x64, 0x41, 0x74, 0x74, 0x72, 0x69, 0x62, 0x75, 0x74,
+	0x65, 0x73, 0x12, 0x24, 0x0a, 0x0e, 0x74, 0x69, 0x6d, 0x65, 0x5f, 0x75, 0x6e, 0x69, 0x78, 0x5f,
+	0x6e, 0x61, 0x6e, 0x6f, 0x18, 0x02, 0x20, 0x01, 0x28, 0x06, 0x52, 0x0c, 0x74, 0x69, 0x6d, 0x65,
+	0x55, 0x6e, 0x69, 0x78, 0x4e, 0x61, 0x6e, 0x6f, 0x12, 0x1d, 0x0a, 0x09, 0x61, 0x73, 0x5f, 0x64,
+	0x6f, 0x75, 0x62, 0x6c, 0x65, 0x18, 0x03, 0x20, 0x01, 0x28, 0x01, 0x48, 0x00, 0x52, 0x08, 0x61,
+	0x73, 0x44, 0x6f, 0x75, 0x62, 0x6c, 0x65, 0x12, 0x17, 0x0a, 0x06, 0x61, 0x73, 0x5f, 0x69, 0x6e,
+	0x74, 0x18, 0x06, 0x20, 0x01, 0x28, 0x10, 0x48, 0x00, 0x52, 0x05, 0x61, 0x73, 0x49, 0x6e, 0x74,
+	0x12, 0x17, 0x0a, 0x07, 0x73, 0x70, 0x61, 0x6e, 0x5f, 0x69, 0x64, 0x18, 0x04, 0x20, 0x01, 0x28,
+	0x0c, 0x52, 0x06, 0x73, 0x70, 0x61, 0x6e, 0x49, 0x64, 0x12, 0x19, 0x0a, 0x08, 0x74, 0x72, 0x61,
+	0x63, 0x65, 0x5f, 0x69, 0x64, 0x18, 0x05, 0x20, 0x01, 0x28, 0x0c, 0x52, 0x07, 0x74, 0x72, 0x61,
+	0x63, 0x65, 0x49, 0x64, 0x42, 0x07, 0x0a, 0x05, 0x76, 0x61, 0x6c, 0x75, 0x65, 0x4a, 0x04, 0x08,
+	0x01, 0x10, 0x02, 0x2a, 0x8c, 0x01, 0x0a, 0x16, 0x41, 0x67, 0x67, 0x72, 0x65, 0x67, 0x61, 0x74,
+	0x69, 0x6f, 0x6e, 0x54, 0x65, 0x6d, 0x70, 0x6f, 0x72, 0x61, 0x6c, 0x69, 0x74, 0x79, 0x12, 0x27,
+	0x0a, 0x23, 0x41, 0x47, 0x47, 0x52, 0x45, 0x47, 0x41, 0x54, 0x49, 0x4f, 0x4e, 0x5f, 0x54, 0x45,
+	0x4d, 0x50, 0x4f, 0x52, 0x41, 0x4c, 0x49, 0x54, 0x59, 0x5f, 0x55, 0x4e, 0x53, 0x50, 0x45, 0x43,
+	0x49, 0x46, 0x49, 0x45, 0x44, 0x10, 0x00, 0x12, 0x21, 0x0a, 0x1d, 0x41, 0x47, 0x47, 0x52, 0x45,
 	0x47, 0x41, 0x54, 0x49, 0x4f, 0x4e, 0x5f, 0x54, 0x45, 0x4d, 0x50, 0x4f, 0x52, 0x41, 0x4c, 0x49,
-	0x54, 0x59, 0x5f, 0x55, 0x4e, 0x53, 0x50, 0x45, 0x43, 0x49, 0x46, 0x49, 0x45, 0x44, 0x10, 0x00,
-	0x12, 0x21, 0x0a, 0x1d, 0x41, 0x47, 0x47, 0x52, 0x45, 0x47, 0x41, 0x54, 0x49, 0x4f, 0x4e, 0x5f,
-	0x54, 0x45, 0x4d, 0x50, 0x4f, 0x52, 0x41, 0x4c, 0x49, 0x54, 0x59, 0x5f, 0x44, 0x45, 0x4c, 0x54,
-	0x41, 0x10, 0x01, 0x12, 0x26, 0x0a, 0x22, 0x41, 0x47, 0x47, 0x52, 0x45, 0x47, 0x41, 0x54, 0x49,
-	0x4f, 0x4e, 0x5f, 0x54, 0x45, 0x4d, 0x50, 0x4f, 0x52, 0x41, 0x4c, 0x49, 0x54, 0x59, 0x5f, 0x43,
-	0x55, 0x4d, 0x55, 0x4c, 0x41, 0x54, 0x49, 0x56, 0x45, 0x10, 0x02, 0x2a, 0x3b, 0x0a, 0x0e, 0x44,
-	0x61, 0x74, 0x61, 0x50, 0x6f, 0x69, 0x6e, 0x74, 0x46, 0x6c, 0x61, 0x67, 0x73, 0x12, 0x0d, 0x0a,
-	0x09, 0x46, 0x4c, 0x41, 0x47, 0x5f, 0x4e, 0x4f, 0x4e, 0x45, 0x10, 0x00, 0x12, 0x1a, 0x0a, 0x16,
-	0x46, 0x4c, 0x41, 0x47, 0x5f, 0x4e, 0x4f, 0x5f, 0x52, 0x45, 0x43, 0x4f, 0x52, 0x44, 0x45, 0x44,
-	0x5f, 0x56, 0x41, 0x4c, 0x55, 0x45, 0x10, 0x01, 0x42, 0x7f, 0x0a, 0x21, 0x69, 0x6f, 0x2e, 0x6f,
-	0x70, 0x65, 0x6e, 0x74, 0x65, 0x6c, 0x65, 0x6d, 0x65, 0x74, 0x72, 0x79, 0x2e, 0x70, 0x72, 0x6f,
-	0x74, 0x6f, 0x2e, 0x6d, 0x65, 0x74, 0x72, 0x69, 0x63, 0x73, 0x2e, 0x76, 0x31, 0x42, 0x0c, 0x4d,
-	0x65, 0x74, 0x72, 0x69, 0x63, 0x73, 0x50, 0x72, 0x6f, 0x74, 0x6f, 0x50, 0x01, 0x5a, 0x29, 0x67,
-	0x6f, 0x2e, 0x6f, 0x70, 0x65, 0x6e, 0x74, 0x65, 0x6c, 0x65, 0x6d, 0x65, 0x74, 0x72, 0x79, 0x2e,
-	0x69, 0x6f, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2f, 0x6f, 0x74, 0x6c, 0x70, 0x2f, 0x6d, 0x65,
-	0x74, 0x72, 0x69, 0x63, 0x73, 0x2f, 0x76, 0x31, 0xaa, 0x02, 0x1e, 0x4f, 0x70, 0x65, 0x6e, 0x54,
-	0x65, 0x6c, 0x65, 0x6d, 0x65, 0x74, 0x72, 0x79, 0x2e, 0x50, 0x72, 0x6f, 0x74, 0x6f, 0x2e, 0x4d,
-	0x65, 0x74, 0x72, 0x69, 0x63, 0x73, 0x2e, 0x56, 0x31, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f,
-	0x33,
+	0x54, 0x59, 0x5f, 0x44, 0x45, 0x4c, 0x54, 0x41, 0x10, 0x01, 0x12, 0x26, 0x0a, 0x22, 0x41, 0x47,
+	0x47, 0x52, 0x45, 0x47, 0x41, 0x54, 0x49, 0x4f, 0x4e, 0x5f, 0x54, 0x45, 0x4d, 0x50, 0x4f, 0x52,
+	0x41, 0x4c, 0x49, 0x54, 0x59, 0x5f, 0x43, 0x55, 0x4d, 0x55, 0x4c, 0x41, 0x54, 0x49, 0x56, 0x45,
+	0x10, 0x02, 0x2a, 0x5e, 0x0a, 0x0e, 0x44, 0x61, 0x74, 0x61, 0x50, 0x6f, 0x69, 0x6e, 0x74, 0x46,
+	0x6c, 0x61, 0x67, 0x73, 0x12, 0x1f, 0x0a, 0x1b, 0x44, 0x41, 0x54, 0x41, 0x5f, 0x50, 0x4f, 0x49,
+	0x4e, 0x54, 0x5f, 0x46, 0x4c, 0x41, 0x47, 0x53, 0x5f, 0x44, 0x4f, 0x5f, 0x4e, 0x4f, 0x54, 0x5f,
+	0x55, 0x53, 0x45, 0x10, 0x00, 0x12, 0x2b, 0x0a, 0x27, 0x44, 0x41, 0x54, 0x41, 0x5f, 0x50, 0x4f,
+	0x49, 0x4e, 0x54, 0x5f, 0x46, 0x4c, 0x41, 0x47, 0x53, 0x5f, 0x4e, 0x4f, 0x5f, 0x52, 0x45, 0x43,
+	0x4f, 0x52, 0x44, 0x45, 0x44, 0x5f, 0x56, 0x41, 0x4c, 0x55, 0x45, 0x5f, 0x4d, 0x41, 0x53, 0x4b,
+	0x10, 0x01, 0x42, 0x7f, 0x0a, 0x21, 0x69, 0x6f, 0x2e, 0x6f, 0x70, 0x65, 0x6e, 0x74, 0x65, 0x6c,
+	0x65, 0x6d, 0x65, 0x74, 0x72, 0x79, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2e, 0x6d, 0x65, 0x74,
+	0x72, 0x69, 0x63, 0x73, 0x2e, 0x76, 0x31, 0x42, 0x0c, 0x4d, 0x65, 0x74, 0x72, 0x69, 0x63, 0x73,
+	0x50, 0x72, 0x6f, 0x74, 0x6f, 0x50, 0x01, 0x5a, 0x29, 0x67, 0x6f, 0x2e, 0x6f, 0x70, 0x65, 0x6e,
+	0x74, 0x65, 0x6c, 0x65, 0x6d, 0x65, 0x74, 0x72, 0x79, 0x2e, 0x69, 0x6f, 0x2f, 0x70, 0x72, 0x6f,
+	0x74, 0x6f, 0x2f, 0x6f, 0x74, 0x6c, 0x70, 0x2f, 0x6d, 0x65, 0x74, 0x72, 0x69, 0x63, 0x73, 0x2f,
+	0x76, 0x31, 0xaa, 0x02, 0x1e, 0x4f, 0x70, 0x65, 0x6e, 0x54, 0x65, 0x6c, 0x65, 0x6d, 0x65, 0x74,
+	0x72, 0x79, 0x2e, 0x50, 0x72, 0x6f, 0x74, 0x6f, 0x2e, 0x4d, 0x65, 0x74, 0x72, 0x69, 0x63, 0x73,
+	0x2e, 0x56, 0x31, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
diff --git a/otlp/trace/v1/trace.pb.go b/otlp/trace/v1/trace.pb.go
index 5689974..51a4998 100644
--- a/otlp/trace/v1/trace.pb.go
+++ b/otlp/trace/v1/trace.pb.go
@@ -117,8 +117,8 @@ type Status_StatusCode int32
 const (
 	// The default status.
 	Status_STATUS_CODE_UNSET Status_StatusCode = 0
-	// The Span has been validated by an Application developers or Operator to have
-	// completed successfully.
+	// The Span has been validated by an Application developer or Operator to
+	// have completed successfully.
 	Status_STATUS_CODE_OK Status_StatusCode = 1
 	// The Span contains an error.
 	Status_STATUS_CODE_ERROR Status_StatusCode = 2
@@ -374,20 +374,16 @@ type Span struct {
 	unknownFields protoimpl.UnknownFields
 
 	// A unique identifier for a trace. All spans from the same trace share
-	// the same `trace_id`. The ID is a 16-byte array. An ID with all zeroes
-	// is considered invalid.
-	//
-	// This field is semantically required. Receiver should generate new
-	// random trace_id if empty or invalid trace_id was received.
+	// the same `trace_id`. The ID is a 16-byte array. An ID with all zeroes OR
+	// of length other than 16 bytes is considered invalid (empty string in OTLP/JSON
+	// is zero-length and thus is also invalid).
 	//
 	// This field is required.
 	TraceId []byte `protobuf:"bytes,1,opt,name=trace_id,json=traceId,proto3" json:"trace_id,omitempty"`
 	// A unique identifier for a span within a trace, assigned when the span
-	// is created. The ID is an 8-byte array. An ID with all zeroes is considered
-	// invalid.
-	//
-	// This field is semantically required. Receiver should generate new
-	// random span_id if empty or invalid span_id was received.
+	// is created. The ID is an 8-byte array. An ID with all zeroes OR of length
+	// other than 8 bytes is considered invalid (empty string in OTLP/JSON
+	// is zero-length and thus is also invalid).
 	//
 	// This field is required.
 	SpanId []byte `protobuf:"bytes,2,opt,name=span_id,json=spanId,proto3" json:"span_id,omitempty"`
@@ -433,8 +429,8 @@ type Span struct {
 	//
 	//     "/http/user_agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36"
 	//     "/http/server_latency": 300
-	//     "abc.com/myattribute": true
-	//     "abc.com/score": 10.239
+	//     "example.com/myattribute": true
+	//     "example.com/score": 10.239
 	//
 	// The OpenTelemetry API specification further restricts the allowed value types:
 	// https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/common/README.md#attribute
diff --git a/versions.yaml b/versions.yaml
index 779637a..2de5190 100644
--- a/versions.yaml
+++ b/versions.yaml
@@ -14,7 +14,7 @@
 
 module-sets:
   all:
-    version: v0.19.0
+    version: v0.20.0
     modules:
       - go.opentelemetry.io/proto
       - go.opentelemetry.io/proto/otlp