diff --git a/aggregationpb/aggregation.pb.go b/aggregationpb/aggregation.pb.go
index 776de22..d3a8e21 100644
--- a/aggregationpb/aggregation.pb.go
+++ b/aggregationpb/aggregation.pb.go
@@ -16,7 +16,6 @@ import (
 
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
-	timestamppb "google.golang.org/protobuf/types/known/timestamppb"
 )
 
 const (
@@ -35,7 +34,7 @@ type CombinedMetrics struct {
 	OverflowServices                  *Overflow              `protobuf:"bytes,2,opt,name=overflow_services,json=overflowServices,proto3" json:"overflow_services,omitempty"`
 	OverflowServiceInstancesEstimator []byte                 `protobuf:"bytes,3,opt,name=overflow_service_instances_estimator,json=overflowServiceInstancesEstimator,proto3" json:"overflow_service_instances_estimator,omitempty"`
 	EventsTotal                       int64                  `protobuf:"varint,4,opt,name=events_total,json=eventsTotal,proto3" json:"events_total,omitempty"`
-	YoungestEventTimestamp            *timestamppb.Timestamp `protobuf:"bytes,5,opt,name=youngest_event_timestamp,json=youngestEventTimestamp,proto3" json:"youngest_event_timestamp,omitempty"`
+	YoungestEventTimestamp            uint64                 `protobuf:"varint,5,opt,name=youngest_event_timestamp,json=youngestEventTimestamp,proto3" json:"youngest_event_timestamp,omitempty"`
 }
 
 func (x *CombinedMetrics) Reset() {
@@ -98,11 +97,11 @@ func (x *CombinedMetrics) GetEventsTotal() int64 {
 	return 0
 }
 
-func (x *CombinedMetrics) GetYoungestEventTimestamp() *timestamppb.Timestamp {
+func (x *CombinedMetrics) GetYoungestEventTimestamp() uint64 {
 	if x != nil {
 		return x.YoungestEventTimestamp
 	}
-	return nil
+	return 0
 }
 
 type KeyedServiceMetrics struct {
@@ -165,12 +164,12 @@ type ServiceAggregationKey struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Timestamp           *timestamppb.Timestamp `protobuf:"bytes,1,opt,name=timestamp,proto3" json:"timestamp,omitempty"`
-	ServiceName         string                 `protobuf:"bytes,2,opt,name=service_name,json=serviceName,proto3" json:"service_name,omitempty"`
-	ServiceEnvironment  string                 `protobuf:"bytes,3,opt,name=service_environment,json=serviceEnvironment,proto3" json:"service_environment,omitempty"`
-	ServiceLanguageName string                 `protobuf:"bytes,4,opt,name=service_language_name,json=serviceLanguageName,proto3" json:"service_language_name,omitempty"`
-	AgentName           string                 `protobuf:"bytes,5,opt,name=agent_name,json=agentName,proto3" json:"agent_name,omitempty"`
-	GlobalLabelsStr     []byte                 `protobuf:"bytes,6,opt,name=global_labels_str,json=globalLabelsStr,proto3" json:"global_labels_str,omitempty"`
+	Timestamp           uint64 `protobuf:"varint,1,opt,name=timestamp,proto3" json:"timestamp,omitempty"`
+	ServiceName         string `protobuf:"bytes,2,opt,name=service_name,json=serviceName,proto3" json:"service_name,omitempty"`
+	ServiceEnvironment  string `protobuf:"bytes,3,opt,name=service_environment,json=serviceEnvironment,proto3" json:"service_environment,omitempty"`
+	ServiceLanguageName string `protobuf:"bytes,4,opt,name=service_language_name,json=serviceLanguageName,proto3" json:"service_language_name,omitempty"`
+	AgentName           string `protobuf:"bytes,5,opt,name=agent_name,json=agentName,proto3" json:"agent_name,omitempty"`
+	GlobalLabelsStr     []byte `protobuf:"bytes,6,opt,name=global_labels_str,json=globalLabelsStr,proto3" json:"global_labels_str,omitempty"`
 }
 
 func (x *ServiceAggregationKey) Reset() {
@@ -205,11 +204,11 @@ func (*ServiceAggregationKey) Descriptor() ([]byte, []int) {
 	return file_proto_aggregation_proto_rawDescGZIP(), []int{2}
 }
 
-func (x *ServiceAggregationKey) GetTimestamp() *timestamppb.Timestamp {
+func (x *ServiceAggregationKey) GetTimestamp() uint64 {
 	if x != nil {
 		return x.Timestamp
 	}
-	return nil
+	return 0
 }
 
 func (x *ServiceAggregationKey) GetServiceName() string {
@@ -1420,292 +1419,286 @@ var File_proto_aggregation_proto protoreflect.FileDescriptor
 var file_proto_aggregation_proto_rawDesc = []byte{
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-	0x65, 0x72, 0x66, 0x6c, 0x6f, 0x77, 0x53, 0x70, 0x61, 0x6e, 0x73, 0x45, 0x73, 0x74, 0x69, 0x6d,
-	0x61, 0x74, 0x6f, 0x72, 0x42, 0x13, 0x48, 0x01, 0x5a, 0x0f, 0x2e, 0x2f, 0x61, 0x67, 0x67, 0x72,
-	0x65, 0x67, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x70, 0x62, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f,
-	0x33,
+	0x73, 0x12, 0x3f, 0x0a, 0x0e, 0x6f, 0x76, 0x65, 0x72, 0x66, 0x6c, 0x6f, 0x77, 0x5f, 0x73, 0x70,
+	0x61, 0x6e, 0x73, 0x18, 0x03, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x18, 0x2e, 0x65, 0x6c, 0x61, 0x73,
+	0x74, 0x69, 0x63, 0x2e, 0x61, 0x70, 0x6d, 0x2e, 0x53, 0x70, 0x61, 0x6e, 0x4d, 0x65, 0x74, 0x72,
+	0x69, 0x63, 0x73, 0x52, 0x0d, 0x6f, 0x76, 0x65, 0x72, 0x66, 0x6c, 0x6f, 0x77, 0x53, 0x70, 0x61,
+	0x6e, 0x73, 0x12, 0x46, 0x0a, 0x1f, 0x6f, 0x76, 0x65, 0x72, 0x66, 0x6c, 0x6f, 0x77, 0x5f, 0x74,
+	0x72, 0x61, 0x6e, 0x73, 0x61, 0x63, 0x74, 0x69, 0x6f, 0x6e, 0x73, 0x5f, 0x65, 0x73, 0x74, 0x69,
+	0x6d, 0x61, 0x74, 0x6f, 0x72, 0x18, 0x04, 0x20, 0x01, 0x28, 0x0c, 0x52, 0x1d, 0x6f, 0x76, 0x65,
+	0x72, 0x66, 0x6c, 0x6f, 0x77, 0x54, 0x72, 0x61, 0x6e, 0x73, 0x61, 0x63, 0x74, 0x69, 0x6f, 0x6e,
+	0x73, 0x45, 0x73, 0x74, 0x69, 0x6d, 0x61, 0x74, 0x6f, 0x72, 0x12, 0x55, 0x0a, 0x27, 0x6f, 0x76,
+	0x65, 0x72, 0x66, 0x6c, 0x6f, 0x77, 0x5f, 0x73, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x5f, 0x74,
+	0x72, 0x61, 0x6e, 0x73, 0x61, 0x63, 0x74, 0x69, 0x6f, 0x6e, 0x73, 0x5f, 0x65, 0x73, 0x74, 0x69,
+	0x6d, 0x61, 0x74, 0x6f, 0x72, 0x18, 0x05, 0x20, 0x01, 0x28, 0x0c, 0x52, 0x24, 0x6f, 0x76, 0x65,
+	0x72, 0x66, 0x6c, 0x6f, 0x77, 0x53, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x54, 0x72, 0x61, 0x6e,
+	0x73, 0x61, 0x63, 0x74, 0x69, 0x6f, 0x6e, 0x73, 0x45, 0x73, 0x74, 0x69, 0x6d, 0x61, 0x74, 0x6f,
+	0x72, 0x12, 0x38, 0x0a, 0x18, 0x6f, 0x76, 0x65, 0x72, 0x66, 0x6c, 0x6f, 0x77, 0x5f, 0x73, 0x70,
+	0x61, 0x6e, 0x73, 0x5f, 0x65, 0x73, 0x74, 0x69, 0x6d, 0x61, 0x74, 0x6f, 0x72, 0x18, 0x06, 0x20,
+	0x01, 0x28, 0x0c, 0x52, 0x16, 0x6f, 0x76, 0x65, 0x72, 0x66, 0x6c, 0x6f, 0x77, 0x53, 0x70, 0x61,
+	0x6e, 0x73, 0x45, 0x73, 0x74, 0x69, 0x6d, 0x61, 0x74, 0x6f, 0x72, 0x42, 0x13, 0x48, 0x01, 0x5a,
+	0x0f, 0x2e, 0x2f, 0x61, 0x67, 0x67, 0x72, 0x65, 0x67, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x70, 0x62,
+	0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -1741,38 +1734,35 @@ var file_proto_aggregation_proto_goTypes = []interface{}{
 	(*CountValue)(nil),                       // 16: elastic.apm.CountValue
 	(*HDRHistogram)(nil),                     // 17: elastic.apm.HDRHistogram
 	(*Overflow)(nil),                         // 18: elastic.apm.Overflow
-	(*timestamppb.Timestamp)(nil),            // 19: google.protobuf.Timestamp
 }
 var file_proto_aggregation_proto_depIdxs = []int32{
 	1,  // 0: elastic.apm.CombinedMetrics.service_metrics:type_name -> elastic.apm.KeyedServiceMetrics
 	18, // 1: elastic.apm.CombinedMetrics.overflow_services:type_name -> elastic.apm.Overflow
-	19, // 2: elastic.apm.CombinedMetrics.youngest_event_timestamp:type_name -> google.protobuf.Timestamp
-	2,  // 3: elastic.apm.KeyedServiceMetrics.key:type_name -> elastic.apm.ServiceAggregationKey
-	3,  // 4: elastic.apm.KeyedServiceMetrics.metrics:type_name -> elastic.apm.ServiceMetrics
-	19, // 5: elastic.apm.ServiceAggregationKey.timestamp:type_name -> google.protobuf.Timestamp
-	6,  // 6: elastic.apm.ServiceMetrics.service_instance_metrics:type_name -> elastic.apm.KeyedServiceInstanceMetrics
-	18, // 7: elastic.apm.ServiceMetrics.overflow_groups:type_name -> elastic.apm.Overflow
-	7,  // 8: elastic.apm.ServiceInstanceMetrics.transaction_metrics:type_name -> elastic.apm.KeyedTransactionMetrics
-	10, // 9: elastic.apm.ServiceInstanceMetrics.service_transaction_metrics:type_name -> elastic.apm.KeyedServiceTransactionMetrics
-	13, // 10: elastic.apm.ServiceInstanceMetrics.span_metrics:type_name -> elastic.apm.KeyedSpanMetrics
-	4,  // 11: elastic.apm.KeyedServiceInstanceMetrics.key:type_name -> elastic.apm.ServiceInstanceAggregationKey
-	5,  // 12: elastic.apm.KeyedServiceInstanceMetrics.metrics:type_name -> elastic.apm.ServiceInstanceMetrics
-	8,  // 13: elastic.apm.KeyedTransactionMetrics.key:type_name -> elastic.apm.TransactionAggregationKey
-	9,  // 14: elastic.apm.KeyedTransactionMetrics.metrics:type_name -> elastic.apm.TransactionMetrics
-	17, // 15: elastic.apm.TransactionMetrics.histogram:type_name -> elastic.apm.HDRHistogram
-	11, // 16: elastic.apm.KeyedServiceTransactionMetrics.key:type_name -> elastic.apm.ServiceTransactionAggregationKey
-	12, // 17: elastic.apm.KeyedServiceTransactionMetrics.metrics:type_name -> elastic.apm.ServiceTransactionMetrics
-	17, // 18: elastic.apm.ServiceTransactionMetrics.histogram:type_name -> elastic.apm.HDRHistogram
-	14, // 19: elastic.apm.KeyedSpanMetrics.key:type_name -> elastic.apm.SpanAggregationKey
-	15, // 20: elastic.apm.KeyedSpanMetrics.metrics:type_name -> elastic.apm.SpanMetrics
-	9,  // 21: elastic.apm.Overflow.overflow_transactions:type_name -> elastic.apm.TransactionMetrics
-	12, // 22: elastic.apm.Overflow.overflow_service_transactions:type_name -> elastic.apm.ServiceTransactionMetrics
-	15, // 23: elastic.apm.Overflow.overflow_spans:type_name -> elastic.apm.SpanMetrics
-	24, // [24:24] is the sub-list for method output_type
-	24, // [24:24] is the sub-list for method input_type
-	24, // [24:24] is the sub-list for extension type_name
-	24, // [24:24] is the sub-list for extension extendee
-	0,  // [0:24] is the sub-list for field type_name
+	2,  // 2: elastic.apm.KeyedServiceMetrics.key:type_name -> elastic.apm.ServiceAggregationKey
+	3,  // 3: elastic.apm.KeyedServiceMetrics.metrics:type_name -> elastic.apm.ServiceMetrics
+	6,  // 4: elastic.apm.ServiceMetrics.service_instance_metrics:type_name -> elastic.apm.KeyedServiceInstanceMetrics
+	18, // 5: elastic.apm.ServiceMetrics.overflow_groups:type_name -> elastic.apm.Overflow
+	7,  // 6: elastic.apm.ServiceInstanceMetrics.transaction_metrics:type_name -> elastic.apm.KeyedTransactionMetrics
+	10, // 7: elastic.apm.ServiceInstanceMetrics.service_transaction_metrics:type_name -> elastic.apm.KeyedServiceTransactionMetrics
+	13, // 8: elastic.apm.ServiceInstanceMetrics.span_metrics:type_name -> elastic.apm.KeyedSpanMetrics
+	4,  // 9: elastic.apm.KeyedServiceInstanceMetrics.key:type_name -> elastic.apm.ServiceInstanceAggregationKey
+	5,  // 10: elastic.apm.KeyedServiceInstanceMetrics.metrics:type_name -> elastic.apm.ServiceInstanceMetrics
+	8,  // 11: elastic.apm.KeyedTransactionMetrics.key:type_name -> elastic.apm.TransactionAggregationKey
+	9,  // 12: elastic.apm.KeyedTransactionMetrics.metrics:type_name -> elastic.apm.TransactionMetrics
+	17, // 13: elastic.apm.TransactionMetrics.histogram:type_name -> elastic.apm.HDRHistogram
+	11, // 14: elastic.apm.KeyedServiceTransactionMetrics.key:type_name -> elastic.apm.ServiceTransactionAggregationKey
+	12, // 15: elastic.apm.KeyedServiceTransactionMetrics.metrics:type_name -> elastic.apm.ServiceTransactionMetrics
+	17, // 16: elastic.apm.ServiceTransactionMetrics.histogram:type_name -> elastic.apm.HDRHistogram
+	14, // 17: elastic.apm.KeyedSpanMetrics.key:type_name -> elastic.apm.SpanAggregationKey
+	15, // 18: elastic.apm.KeyedSpanMetrics.metrics:type_name -> elastic.apm.SpanMetrics
+	9,  // 19: elastic.apm.Overflow.overflow_transactions:type_name -> elastic.apm.TransactionMetrics
+	12, // 20: elastic.apm.Overflow.overflow_service_transactions:type_name -> elastic.apm.ServiceTransactionMetrics
+	15, // 21: elastic.apm.Overflow.overflow_spans:type_name -> elastic.apm.SpanMetrics
+	22, // [22:22] is the sub-list for method output_type
+	22, // [22:22] is the sub-list for method input_type
+	22, // [22:22] is the sub-list for extension type_name
+	22, // [22:22] is the sub-list for extension extendee
+	0,  // [0:22] is the sub-list for field type_name
 }
 
 func init() { file_proto_aggregation_proto_init() }
diff --git a/aggregationpb/aggregation_vtproto.pb.go b/aggregationpb/aggregation_vtproto.pb.go
index 7724355..b7d9863 100644
--- a/aggregationpb/aggregation_vtproto.pb.go
+++ b/aggregationpb/aggregation_vtproto.pb.go
@@ -16,9 +16,7 @@ import (
 	bits "math/bits"
 	sync "sync"
 
-	proto "google.golang.org/protobuf/proto"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
-	timestamppb "google.golang.org/protobuf/types/known/timestamppb"
 )
 
 const (
@@ -58,27 +56,10 @@ func (m *CombinedMetrics) MarshalToSizedBufferVT(dAtA []byte) (int, error) {
 		i -= len(m.unknownFields)
 		copy(dAtA[i:], m.unknownFields)
 	}
-	if m.YoungestEventTimestamp != nil {
-		if vtmsg, ok := interface{}(m.YoungestEventTimestamp).(interface {
-			MarshalToSizedBufferVT([]byte) (int, error)
-		}); ok {
-			size, err := vtmsg.MarshalToSizedBufferVT(dAtA[:i])
-			if err != nil {
-				return 0, err
-			}
-			i -= size
-			i = encodeVarint(dAtA, i, uint64(size))
-		} else {
-			encoded, err := proto.Marshal(m.YoungestEventTimestamp)
-			if err != nil {
-				return 0, err
-			}
-			i -= len(encoded)
-			copy(dAtA[i:], encoded)
-			i = encodeVarint(dAtA, i, uint64(len(encoded)))
-		}
+	if m.YoungestEventTimestamp != 0 {
+		i = encodeVarint(dAtA, i, uint64(m.YoungestEventTimestamp))
 		i--
-		dAtA[i] = 0x2a
+		dAtA[i] = 0x28
 	}
 	if m.EventsTotal != 0 {
 		i = encodeVarint(dAtA, i, uint64(m.EventsTotal))
@@ -235,27 +216,10 @@ func (m *ServiceAggregationKey) MarshalToSizedBufferVT(dAtA []byte) (int, error)
 		i--
 		dAtA[i] = 0x12
 	}
-	if m.Timestamp != nil {
-		if vtmsg, ok := interface{}(m.Timestamp).(interface {
-			MarshalToSizedBufferVT([]byte) (int, error)
-		}); ok {
-			size, err := vtmsg.MarshalToSizedBufferVT(dAtA[:i])
-			if err != nil {
-				return 0, err
-			}
-			i -= size
-			i = encodeVarint(dAtA, i, uint64(size))
-		} else {
-			encoded, err := proto.Marshal(m.Timestamp)
-			if err != nil {
-				return 0, err
-			}
-			i -= len(encoded)
-			copy(dAtA[i:], encoded)
-			i = encodeVarint(dAtA, i, uint64(len(encoded)))
-		}
+	if m.Timestamp != 0 {
+		i = encodeVarint(dAtA, i, uint64(m.Timestamp))
 		i--
-		dAtA[i] = 0xa
+		dAtA[i] = 0x8
 	}
 	return len(dAtA) - i, nil
 }
@@ -1812,15 +1776,8 @@ func (m *CombinedMetrics) SizeVT() (n int) {
 	if m.EventsTotal != 0 {
 		n += 1 + sov(uint64(m.EventsTotal))
 	}
-	if m.YoungestEventTimestamp != nil {
-		if size, ok := interface{}(m.YoungestEventTimestamp).(interface {
-			SizeVT() int
-		}); ok {
-			l = size.SizeVT()
-		} else {
-			l = proto.Size(m.YoungestEventTimestamp)
-		}
-		n += 1 + l + sov(uint64(l))
+	if m.YoungestEventTimestamp != 0 {
+		n += 1 + sov(uint64(m.YoungestEventTimestamp))
 	}
 	n += len(m.unknownFields)
 	return n
@@ -1850,15 +1807,8 @@ func (m *ServiceAggregationKey) SizeVT() (n int) {
 	}
 	var l int
 	_ = l
-	if m.Timestamp != nil {
-		if size, ok := interface{}(m.Timestamp).(interface {
-			SizeVT() int
-		}); ok {
-			l = size.SizeVT()
-		} else {
-			l = proto.Size(m.Timestamp)
-		}
-		n += 1 + l + sov(uint64(l))
+	if m.Timestamp != 0 {
+		n += 1 + sov(uint64(m.Timestamp))
 	}
 	l = len(m.ServiceName)
 	if l > 0 {
@@ -2485,10 +2435,10 @@ func (m *CombinedMetrics) UnmarshalVT(dAtA []byte) error {
 				}
 			}
 		case 5:
-			if wireType != 2 {
+			if wireType != 0 {
 				return fmt.Errorf("proto: wrong wireType = %d for field YoungestEventTimestamp", wireType)
 			}
-			var msglen int
+			m.YoungestEventTimestamp = 0
 			for shift := uint(0); ; shift += 7 {
 				if shift >= 64 {
 					return ErrIntOverflow
@@ -2498,36 +2448,11 @@ func (m *CombinedMetrics) UnmarshalVT(dAtA []byte) error {
 				}
 				b := dAtA[iNdEx]
 				iNdEx++
-				msglen |= int(b&0x7F) << shift
+				m.YoungestEventTimestamp |= uint64(b&0x7F) << shift
 				if b < 0x80 {
 					break
 				}
 			}
-			if msglen < 0 {
-				return ErrInvalidLength
-			}
-			postIndex := iNdEx + msglen
-			if postIndex < 0 {
-				return ErrInvalidLength
-			}
-			if postIndex > l {
-				return io.ErrUnexpectedEOF
-			}
-			if m.YoungestEventTimestamp == nil {
-				m.YoungestEventTimestamp = &timestamppb.Timestamp{}
-			}
-			if unmarshal, ok := interface{}(m.YoungestEventTimestamp).(interface {
-				UnmarshalVT([]byte) error
-			}); ok {
-				if err := unmarshal.UnmarshalVT(dAtA[iNdEx:postIndex]); err != nil {
-					return err
-				}
-			} else {
-				if err := proto.Unmarshal(dAtA[iNdEx:postIndex], m.YoungestEventTimestamp); err != nil {
-					return err
-				}
-			}
-			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skip(dAtA[iNdEx:])
@@ -2703,10 +2628,10 @@ func (m *ServiceAggregationKey) UnmarshalVT(dAtA []byte) error {
 		}
 		switch fieldNum {
 		case 1:
-			if wireType != 2 {
+			if wireType != 0 {
 				return fmt.Errorf("proto: wrong wireType = %d for field Timestamp", wireType)
 			}
-			var msglen int
+			m.Timestamp = 0
 			for shift := uint(0); ; shift += 7 {
 				if shift >= 64 {
 					return ErrIntOverflow
@@ -2716,36 +2641,11 @@ func (m *ServiceAggregationKey) UnmarshalVT(dAtA []byte) error {
 				}
 				b := dAtA[iNdEx]
 				iNdEx++
-				msglen |= int(b&0x7F) << shift
+				m.Timestamp |= uint64(b&0x7F) << shift
 				if b < 0x80 {
 					break
 				}
 			}
-			if msglen < 0 {
-				return ErrInvalidLength
-			}
-			postIndex := iNdEx + msglen
-			if postIndex < 0 {
-				return ErrInvalidLength
-			}
-			if postIndex > l {
-				return io.ErrUnexpectedEOF
-			}
-			if m.Timestamp == nil {
-				m.Timestamp = &timestamppb.Timestamp{}
-			}
-			if unmarshal, ok := interface{}(m.Timestamp).(interface {
-				UnmarshalVT([]byte) error
-			}); ok {
-				if err := unmarshal.UnmarshalVT(dAtA[iNdEx:postIndex]); err != nil {
-					return err
-				}
-			} else {
-				if err := proto.Unmarshal(dAtA[iNdEx:postIndex], m.Timestamp); err != nil {
-					return err
-				}
-			}
-			iNdEx = postIndex
 		case 2:
 			if wireType != 2 {
 				return fmt.Errorf("proto: wrong wireType = %d for field ServiceName", wireType)
diff --git a/aggregators/aggregator_test.go b/aggregators/aggregator_test.go
index 8eecf1f..f969227 100644
--- a/aggregators/aggregator_test.go
+++ b/aggregators/aggregator_test.go
@@ -741,7 +741,7 @@ func TestHarvest(t *testing.T) {
 		expectedMeasurements = append(expectedMeasurements, apmmodel.Metrics{
 			Samples: map[string]apmmodel.Metric{
 				"aggregator.requests.total": {Value: 1},
-				"aggregator.bytes.ingested": {Value: 273},
+				"aggregator.bytes.ingested": {Value: 261},
 			},
 			Labels: apmmodel.StringMap{
 				apmmodel.StringMapItem{Key: "id_key", Value: cmID},
diff --git a/aggregators/codec.go b/aggregators/codec.go
index 07feb4e..6efc9de 100644
--- a/aggregators/codec.go
+++ b/aggregators/codec.go
@@ -13,12 +13,11 @@ import (
 	"sort"
 	"time"
 
-	"google.golang.org/protobuf/types/known/timestamppb"
-
 	"github.com/axiomhq/hyperloglog"
 
 	"github.com/elastic/apm-aggregation/aggregationpb"
 	"github.com/elastic/apm-aggregation/aggregators/internal/hdrhistogram"
+	"github.com/elastic/apm-aggregation/aggregators/internal/timestamppb"
 	"github.com/elastic/apm-data/model/modelpb"
 )
 
@@ -74,7 +73,7 @@ func (m *CombinedMetrics) ToProto() *aggregationpb.CombinedMetrics {
 	pb.OverflowServices = m.OverflowServices.ToProto()
 	pb.OverflowServiceInstancesEstimator = hllBytes(m.OverflowServiceInstancesEstimator)
 	pb.EventsTotal = m.eventsTotal
-	pb.YoungestEventTimestamp = timestamppb.New(m.youngestEventTimestamp)
+	pb.YoungestEventTimestamp = timestamppb.TimeToPBTimestamp(m.youngestEventTimestamp)
 	return pb
 }
 
@@ -93,7 +92,7 @@ func (m *CombinedMetrics) FromProto(pb *aggregationpb.CombinedMetrics) {
 	}
 	m.OverflowServiceInstancesEstimator = hllSketch(pb.OverflowServiceInstancesEstimator)
 	m.eventsTotal = pb.EventsTotal
-	m.youngestEventTimestamp = pb.GetYoungestEventTimestamp().AsTime()
+	m.youngestEventTimestamp = timestamppb.PBTimestampToTime(pb.YoungestEventTimestamp)
 }
 
 // MarshalBinary marshals CombinedMetrics to binary using protobuf.
@@ -117,7 +116,7 @@ func (m *CombinedMetrics) UnmarshalBinary(data []byte) error {
 // ToProto converts ServiceAggregationKey to its protobuf representation.
 func (k *ServiceAggregationKey) ToProto() *aggregationpb.ServiceAggregationKey {
 	pb := aggregationpb.ServiceAggregationKeyFromVTPool()
-	pb.Timestamp = timestamppb.New(k.Timestamp)
+	pb.Timestamp = timestamppb.TimeToPBTimestamp(k.Timestamp)
 	pb.ServiceName = k.ServiceName
 	pb.ServiceEnvironment = k.ServiceEnvironment
 	pb.ServiceLanguageName = k.ServiceLanguageName
@@ -127,7 +126,7 @@ func (k *ServiceAggregationKey) ToProto() *aggregationpb.ServiceAggregationKey {
 
 // FromProto converts protobuf representation to ServiceAggregationKey.
 func (k *ServiceAggregationKey) FromProto(pb *aggregationpb.ServiceAggregationKey) {
-	k.Timestamp = pb.Timestamp.AsTime()
+	k.Timestamp = timestamppb.PBTimestampToTime(pb.Timestamp)
 	k.ServiceName = pb.ServiceName
 	k.ServiceEnvironment = pb.ServiceEnvironment
 	k.ServiceLanguageName = pb.ServiceLanguageName
diff --git a/aggregators/internal/timestamppb/timestamppb.go b/aggregators/internal/timestamppb/timestamppb.go
new file mode 100644
index 0000000..e80c1ea
--- /dev/null
+++ b/aggregators/internal/timestamppb/timestamppb.go
@@ -0,0 +1,19 @@
+// Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+// or more contributor license agreements. Licensed under the Elastic License 2.0;
+// you may not use this file except in compliance with the Elastic License 2.0.
+
+// Package timestamppb provides helper functions to encode and decode time.Time
+// for protobuf.
+package timestamppb
+
+import "time"
+
+// TimeToPBTimestamp encodes a time.Time to Unix epoch nanos in uint64 for protobuf.
+func TimeToPBTimestamp(t time.Time) uint64 {
+	return uint64(t.UnixNano())
+}
+
+// PBTimestampToTime decodes a uint64 of Unix epoch nanos to a time.Time for protobuf.
+func PBTimestampToTime(timestamp uint64) time.Time {
+	return time.Unix(0, int64(timestamp)).UTC()
+}
diff --git a/aggregators/internal/timestamppb/timestamppb_test.go b/aggregators/internal/timestamppb/timestamppb_test.go
new file mode 100644
index 0000000..fe02ed7
--- /dev/null
+++ b/aggregators/internal/timestamppb/timestamppb_test.go
@@ -0,0 +1,17 @@
+// Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+// or more contributor license agreements. Licensed under the Elastic License 2.0;
+// you may not use this file except in compliance with the Elastic License 2.0.
+
+package timestamppb
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestTimeToPBTimestamp(t *testing.T) {
+	tt := time.Date(2000, 1, 2, 3, 4, 5, 6, time.UTC)
+	assert.Equal(t, tt, PBTimestampToTime(TimeToPBTimestamp(tt)))
+}
diff --git a/proto/aggregation.proto b/proto/aggregation.proto
index 8c245ba..0d297a1 100644
--- a/proto/aggregation.proto
+++ b/proto/aggregation.proto
@@ -5,14 +5,12 @@ package elastic.apm;
 option go_package = "./aggregationpb";
 option optimize_for = SPEED;
 
-import "google/protobuf/timestamp.proto";
-
 message CombinedMetrics {
   repeated KeyedServiceMetrics service_metrics = 1;
   Overflow overflow_services = 2;
   bytes overflow_service_instances_estimator = 3;
   int64 events_total = 4;
-  google.protobuf.Timestamp youngest_event_timestamp = 5;
+  uint64 youngest_event_timestamp = 5;
 }
 
 message KeyedServiceMetrics {
@@ -21,7 +19,7 @@ message KeyedServiceMetrics {
 }
 
 message ServiceAggregationKey {
-  google.protobuf.Timestamp timestamp = 1;
+  uint64 timestamp = 1;
   string service_name = 2;
   string service_environment = 3;
   string service_language_name = 4;