add strict semantic convention 1.27 support

config/config.go

@@ -144,6 +144,7 @@ type GlobalOpts struct {
 	ReportHeaders           bool       `json:"report_headers"`
 	MetricsStaticAttributes Attributes `json:"metrics_static_attributes"`
 	TracesStaticAttributes  Attributes `json:"traces_static_attributes"`
+	SemConv                 string     `json:"semantic_convention"`
 }
 
 // PipeOpts has the options for the KrakenD pipe stage

go.mod

@@ -1,23 +1,23 @@
 module github.com/krakend/krakend-otel
 
-go 1.21
+go 1.22.0
 
-toolchain go1.23.0
+toolchain go1.23.3
 
 require (
 	github.com/gin-gonic/gin v1.9.1
 	github.com/luraproject/lura/v2 v2.6.2
 	github.com/prometheus/client_golang v1.18.0
-	go.opentelemetry.io/otel v1.28.0
+	go.opentelemetry.io/otel v1.33.0
 	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc v1.28.0
 	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp v1.28.0
 	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.28.0
 	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.28.0
 	go.opentelemetry.io/otel/exporters/prometheus v0.46.0
-	go.opentelemetry.io/otel/metric v1.28.0
+	go.opentelemetry.io/otel/metric v1.33.0
 	go.opentelemetry.io/otel/sdk v1.28.0
 	go.opentelemetry.io/otel/sdk/metric v1.28.0
-	go.opentelemetry.io/otel/trace v1.28.0
+	go.opentelemetry.io/otel/trace v1.33.0
 )
 
 require (
@@ -51,6 +51,7 @@ require (
 	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
 	github.com/ugorji/go/codec v1.2.11 // indirect
 	github.com/valyala/fastrand v1.1.0 // indirect
+	go.opentelemetry.io/auto/sdk v1.1.0 // indirect
 	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.28.0 // indirect
 	go.opentelemetry.io/proto/otlp v1.3.1 // indirect
 	golang.org/x/arch v0.3.0 // indirect

go.sum

@@ -77,8 +77,8 @@ github.com/prometheus/common v0.45.0 h1:2BGz0eBc2hdMDLnO/8n0jeB3oPrt2D08CekT0lne
 github.com/prometheus/common v0.45.0/go.mod h1:YJmSTw9BoKxJplESWWxlbyttQR4uaEcGyv9MZjVOJsY=
 github.com/prometheus/procfs v0.12.0 h1:jluTpSng7V9hY0O2R9DzzJHYb2xULk9VTR1V1R/k6Bo=
 github.com/prometheus/procfs v0.12.0/go.mod h1:pcuDEFsWDnvcgNzo4EEweacyhjeA9Zk3cnaOZAZEfOo=
-github.com/rogpeppe/go-internal v1.12.0 h1:exVL4IDcn6na9z1rAb56Vxr+CgyK3nn3O+epU5NdKM8=
-github.com/rogpeppe/go-internal v1.12.0/go.mod h1:E+RYuTGaKKdloAfM02xzb0FW3Paa99yedzYV+kq4uf4=
+github.com/rogpeppe/go-internal v1.13.1 h1:KvO1DLK/DRN07sQ1LQKScxyZJuNnedQ5/wKSR38lUII=
+github.com/rogpeppe/go-internal v1.13.1/go.mod h1:uMEvuHeurkdAXX61udpOXGD/AzZDWNMNyH2VO9fmH0o=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
 github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
@@ -89,16 +89,18 @@ github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO
 github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
 github.com/stretchr/testify v1.8.2/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
 github.com/stretchr/testify v1.8.3/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
-github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
-github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
+github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
+github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
 github.com/twitchyliquid64/golang-asm v0.15.1 h1:SU5vSMR7hnwNxj24w34ZyCi/FmDZTkS4MhqMhdFk5YI=
 github.com/twitchyliquid64/golang-asm v0.15.1/go.mod h1:a1lVb/DtPvCB8fslRZhAngC2+aY1QWCk3Cedj/Gdt08=
 github.com/ugorji/go/codec v1.2.11 h1:BMaWp1Bb6fHwEtbplGBGJ498wD+LKlNSl25MjdZY4dU=
 github.com/ugorji/go/codec v1.2.11/go.mod h1:UNopzCgEMSXjBc6AOMqYvWC1ktqTAfzJZUZgYf6w6lg=
 github.com/valyala/fastrand v1.1.0 h1:f+5HkLW4rsgzdNoleUOB69hyT9IlD2ZQh9GyDMfb5G8=
 github.com/valyala/fastrand v1.1.0/go.mod h1:HWqCzkrkg6QXT8V2EXWvXCoow7vLwOFN002oeRzjapQ=
-go.opentelemetry.io/otel v1.28.0 h1:/SqNcYk+idO0CxKEUOtKQClMK/MimZihKYMruSMViUo=
-go.opentelemetry.io/otel v1.28.0/go.mod h1:q68ijF8Fc8CnMHKyzqL6akLO46ePnjkgfIMIjUIX9z4=
+go.opentelemetry.io/auto/sdk v1.1.0 h1:cH53jehLUN6UFLY71z+NDOiNJqDdPRaXzTel0sJySYA=
+go.opentelemetry.io/auto/sdk v1.1.0/go.mod h1:3wSPjt5PWp2RhlCcmmOial7AvC4DQqZb7a7wCow3W8A=
+go.opentelemetry.io/otel v1.33.0 h1:/FerN9bax5LoK51X/sI0SVYrjSE0/yUL7DpxW4K3FWw=
+go.opentelemetry.io/otel v1.33.0/go.mod h1:SUUkR6csvUQl+yjReHu5uM3EtVV7MBm5FHKRlNx4I8I=
 go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc v1.28.0 h1:U2guen0GhqH8o/G2un8f/aG/y++OuW6MyCo6hT9prXk=
 go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc v1.28.0/go.mod h1:yeGZANgEcpdx/WK0IvvRFC+2oLiMS2u4L/0Rj2M2Qr0=
 go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp v1.28.0 h1:aLmmtjRke7LPDQ3lvpFz+kNEH43faFhzW7v8BFIEydg=
@@ -107,20 +109,18 @@ go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.28.0 h1:3Q/xZUyC1BBkualc9RO
 go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.28.0/go.mod h1:s75jGIWA9OfCMzF0xr+ZgfrB5FEbbV7UuYo32ahUiFI=
 go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.28.0 h1:R3X6ZXmNPRR8ul6i3WgFURCHzaXjHdm0karRG/+dj3s=
 go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.28.0/go.mod h1:QWFXnDavXWwMx2EEcZsf3yxgEKAqsxQ+Syjp+seyInw=
-go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.24.0 h1:Xw8U6u2f8DK2XAkGRFV7BBLENgnTGX9i4rQRxJf+/vs=
-go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.24.0/go.mod h1:6KW1Fm6R/s6Z3PGXwSJN2K4eT6wQB3vXX6CVnYX9NmM=
 go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.28.0 h1:j9+03ymgYhPKmeXGk5Zu+cIZOlVzd9Zv7QIiyItjFBU=
 go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.28.0/go.mod h1:Y5+XiUG4Emn1hTfciPzGPJaSI+RpDts6BnCIir0SLqk=
 go.opentelemetry.io/otel/exporters/prometheus v0.46.0 h1:I8WIFXR351FoLJYuloU4EgXbtNX2URfU/85pUPheIEQ=
 go.opentelemetry.io/otel/exporters/prometheus v0.46.0/go.mod h1:ztwVUHe5DTR/1v7PeuGRnU5Bbd4QKYwApWmuutKsJSs=
-go.opentelemetry.io/otel/metric v1.28.0 h1:f0HGvSl1KRAU1DLgLGFjrwVyismPlnuU6JD6bOeuA5Q=
-go.opentelemetry.io/otel/metric v1.28.0/go.mod h1:Fb1eVBFZmLVTMb6PPohq3TO9IIhUisDsbJoL/+uQW4s=
+go.opentelemetry.io/otel/metric v1.33.0 h1:r+JOocAyeRVXD8lZpjdQjzMadVZp2M4WmQ+5WtEnklQ=
+go.opentelemetry.io/otel/metric v1.33.0/go.mod h1:L9+Fyctbp6HFTddIxClbQkjtubW6O9QS3Ann/M82u6M=
 go.opentelemetry.io/otel/sdk v1.28.0 h1:b9d7hIry8yZsgtbmM0DKyPWMMUMlK9NEKuIG4aBqWyE=
 go.opentelemetry.io/otel/sdk v1.28.0/go.mod h1:oYj7ClPUA7Iw3m+r7GeEjz0qckQRJK2B8zjcZEfu7Pg=
 go.opentelemetry.io/otel/sdk/metric v1.28.0 h1:OkuaKgKrgAbYrrY0t92c+cC+2F6hsFNnCQArXCKlg08=
 go.opentelemetry.io/otel/sdk/metric v1.28.0/go.mod h1:cWPjykihLAPvXKi4iZc1dpER3Jdq2Z0YLse3moQUCpg=
-go.opentelemetry.io/otel/trace v1.28.0 h1:GhQ9cUuQGmNDd5BTCP2dAvv75RdMxEfTmYejp+lkx9g=
-go.opentelemetry.io/otel/trace v1.28.0/go.mod h1:jPyXzNPg6da9+38HEwElrQiHlVMTnVfM3/yv2OlIHaI=
+go.opentelemetry.io/otel/trace v1.33.0 h1:cCJuF7LRjUFso9LPnEAHJDB2pqzp+hbO8eu1qqW2d/s=
+go.opentelemetry.io/otel/trace v1.33.0/go.mod h1:uIcdVUZMpTAmz0tI1z04GoVSezK37CbGV4fr1f2nBck=
 go.opentelemetry.io/proto/otlp v1.3.1 h1:TrMUixzpM0yuc/znrFTP9MMRh8trP93mkCiDVeXrui0=
 go.opentelemetry.io/proto/otlp v1.3.1/go.mod h1:0X1WI4de4ZsLrrJNLAQbFeLCm3T7yBkR0XqQ7niQU+8=
 go.uber.org/goleak v1.3.0 h1:2K3zAYmnTNqV73imy9J1T3WC+gmCePx2hEGkimedGto=

http/client/transport_metrics.go

@@ -3,10 +3,14 @@ package client
 import (
 	"context"
 	"errors"
+	"net/http"
+	"strconv"
 
 	"go.opentelemetry.io/otel/attribute"
 	"go.opentelemetry.io/otel/metric"
+	"go.opentelemetry.io/otel/metric/noop"
 	"go.opentelemetry.io/otel/semconv/v1.21.0"
+	v127 "go.opentelemetry.io/otel/semconv/v1.27.0"
 
 	kotelconfig "github.com/krakend/krakend-otel/config"
 )
@@ -19,6 +23,7 @@ type TransportMetricsOptions struct {
 	ReadPayload        bool                 // provide metrics for the reading the full body
 	DetailedConnection bool                 // provide detailed metrics about the connection: dns lookup, tls ...
 	FixedAttributes    []attribute.KeyValue // "static" attributes set at config time.
+	SemConv            string               // to use the latest metric names conventions
 }
 
 // Enabled tells if metrics should be reported for the transport.
@@ -37,7 +42,8 @@ type transportMetrics struct {
 	// the value of the Content-Length header for the request (not the
 	// actual written bytes of the request, that might be cancelled
 	// when it is already on flight.
-	requestContentLength metric.Int64Counter
+	requestContentLength     metric.Int64Counter
+	requestContentLengthHist metric.Int64Histogram
 
 	responseLatency metric.Float64Histogram
 
@@ -56,18 +62,19 @@ type transportMetrics struct {
 	clientName string
 }
 
-func newTransportMetrics(metricsOpts *TransportMetricsOptions, meter metric.Meter, clientName string) *transportMetrics {
-	if meter == nil {
-		return nil
-	}
+type metricFillerFn func(metricsOpts *TransportMetricsOptions, meter metric.Meter, tm *transportMetrics)
+
+func noSemConvMetricsFiller(metricsOpts *TransportMetricsOptions, meter metric.Meter, tm *transportMetrics) {
+	nopMeter := noop.Meter{}
 
-	var tm transportMetrics
 	tm.requestsStarted, _ = meter.Int64Counter("http.client.request.started.count")   // number of reqs started
 	tm.requestsFailed, _ = meter.Int64Counter("http.client.request.failed.count")     // number of reqs failed
 	tm.requestsCanceled, _ = meter.Int64Counter("http.client.request.canceled.count") // number of canceled requests
 	tm.requestsTimedOut, _ = meter.Int64Counter("http.client.request.timedout.count") // numer of timedout request (inclued in failed)
 
 	tm.requestContentLength, _ = meter.Int64Counter("http.client.request.size") // the value of the Content-Length header for the request
+	// For non implemented metrics that can be used with other config, we use a noop meter:
+	tm.requestContentLengthHist, _ = nopMeter.Int64Histogram(v127.HTTPClientRequestBodySizeName)
 
 	tm.responseLatency, _ = meter.Float64Histogram("http.client.duration", kotelconfig.TimeBucketsOpt)
 	tm.responseContentLength, _ = meter.Int64Histogram("http.client.response.size", kotelconfig.SizeBucketsOpt)
@@ -77,38 +84,105 @@ func newTransportMetrics(metricsOpts *TransportMetricsOptions, meter metric.Mete
 	tm.getConnLatency, _ = meter.Float64Histogram("http.client.request.get-conn.duration", kotelconfig.TimeBucketsOpt)
 	tm.dnsLatency, _ = meter.Float64Histogram("http.client.request.dns.duration", kotelconfig.TimeBucketsOpt)
 	tm.tlsLatency, _ = meter.Float64Histogram("http.client.request.tls.duration", kotelconfig.TimeBucketsOpt)
-	return &tm
 }
 
-func (m *transportMetrics) report(rtt *roundTripTracking, attrs []attribute.KeyValue) {
-	if m == nil || m.requestsStarted == nil {
-		// if metrics are nil or not initialized, we just return
-		return
+func semConv1_27MetricsFiller(metricsOpts *TransportMetricsOptions, meter metric.Meter, tm *transportMetrics) {
+	nopMeter := noop.Meter{}
+
+	tm.detailsEnabled = metricsOpts.DetailedConnection
+
+	// For non implemented metrics that can be used with other config, we use a noop meter:
+	tm.requestContentLength, _ = nopMeter.Int64Counter("http.client.request.size")
+
+	// WARNING: Stability => Experimental (subject to change in the future)
+	tm.requestContentLengthHist, _ = meter.Int64Histogram(v127.HTTPClientRequestBodySizeName,
+		metric.WithUnit(v127.HTTPClientRequestBodySizeUnit),
+		metric.WithDescription(v127.HTTPClientRequestBodySizeDescription),
+		kotelconfig.SizeBucketsOpt) // the value of the Content-Length header for the request
+
+	// this is `http.client.request.duration`, and is a required metric:
+	// https://opentelemetry.io/docs/specs/semconv/http/http-metrics/#metric-httpclientrequestduration
+	tm.responseLatency, _ = meter.Float64Histogram(v127.HTTPClientRequestDurationName,
+		metric.WithUnit(v127.HTTPClientRequestDurationUnit),
+		metric.WithDescription(v127.HTTPClientRequestDurationDescription),
+		kotelconfig.TimeBucketsOpt)
+
+	// WARNING: Stability => Experimental (subject to change in the future)
+	tm.responseContentLength, _ = meter.Int64Histogram(v127.HTTPClientResponseBodySizeName,
+		metric.WithUnit(v127.HTTPClientResponseBodySizeUnit),
+		metric.WithDescription(v127.HTTPClientResponseBodySizeDescription),
+		kotelconfig.SizeBucketsOpt) // the value of the Content-Length header for the response
+
+	// TODO: if we want the exact semantic convention, what should we do with our own extra data, that
+	// is not standarized by OTEL ? for now we only set it if the `metricsOpts.DetailedConnection` is
+	// set too:
+	if metricsOpts.DetailedConnection {
+		tm.requestsStarted, _ = meter.Int64Counter("http.client.request.started.count")   // number of reqs started
+		tm.requestsFailed, _ = meter.Int64Counter("http.client.request.failed.count")     // number of reqs failed
+		tm.requestsCanceled, _ = meter.Int64Counter("http.client.request.canceled.count") // number of canceled requests
+		tm.requestsTimedOut, _ = meter.Int64Counter("http.client.request.timedout.count") // numer of timedout request (inclued in failed)
+
+		tm.responseNoContentLength, _ = meter.Int64Counter("http.client.response.no-content-length",
+			metric.WithUnit(v127.HTTPClientResponseBodySizeUnit),
+			metric.WithDescription("Client received responses that do not have 'Content-Length' value set"))
+		tm.getConnLatency, _ = meter.Float64Histogram("http.client.request.get-conn.duration",
+			metric.WithUnit(v127.HTTPClientRequestDurationUnit),
+			metric.WithDescription("Time spent acquiring a client connection"),
+			kotelconfig.TimeBucketsOpt)
+		tm.dnsLatency, _ = meter.Float64Histogram("http.client.request.dns.duration",
+			metric.WithUnit(v127.HTTPClientRequestDurationUnit),
+			metric.WithDescription("Time spent resolving the DNS name"),
+			kotelconfig.TimeBucketsOpt)
+		tm.tlsLatency, _ = meter.Float64Histogram("http.client.request.tls.duration",
+			metric.WithUnit(v127.HTTPClientRequestDurationUnit),
+			metric.WithDescription("Time spent on TLS negotiation and connection"),
+			kotelconfig.TimeBucketsOpt)
+	} else {
+		tm.requestsStarted, _ = nopMeter.Int64Counter("http.client.request.started.count")   // number of reqs started
+		tm.requestsFailed, _ = nopMeter.Int64Counter("http.client.request.failed.count")     // number of reqs failed
+		tm.requestsCanceled, _ = nopMeter.Int64Counter("http.client.request.canceled.count") // number of canceled requests
+		tm.requestsTimedOut, _ = nopMeter.Int64Counter("http.client.request.timedout.count") // numer of timedout request (inclued in failed)
+
+		tm.responseNoContentLength, _ = nopMeter.Int64Counter("http.client.response.no-content-length")
+		tm.getConnLatency, _ = nopMeter.Float64Histogram("http.client.request.get-conn.duration")
+		tm.dnsLatency, _ = nopMeter.Float64Histogram("http.client.request.dns.duration")
+		tm.tlsLatency, _ = nopMeter.Float64Histogram("http.client.request.tls.duration")
 	}
+}
 
-	attrM := make([]attribute.KeyValue, len(attrs), len(attrs)+4)
-	copy(attrM, attrs)
-	if len(m.clientName) > 0 {
-		attrM = append(attrM, attribute.Key("clientname").String(m.clientName))
+func newTransportMetrics(metricsOpts *TransportMetricsOptions, meter metric.Meter, clientName string) *transportMetrics {
+	if meter == nil {
+		return nil
 	}
-	attrM = append(attrM, semconv.HTTPRequestMethodKey.String(rtt.req.Method))
-	attrM = append(attrM, semconv.ServerAddress(rtt.req.RemoteAddr))
 
-	statusCode := 0
-	if rtt.err == nil {
-		// if we fail on the client side, we do not have a status code, but we
-		// want it set to 0 to be displayed on the dashboard
-		statusCode = int(rtt.resp.StatusCode)
+	supportedSemConv := map[string]metricFillerFn{
+		"":     noSemConvMetricsFiller,
+		"1.27": semConv1_27MetricsFiller,
+	}
+	tm := transportMetrics{
+		clientName: clientName,
 	}
-	attrM = append(attrM, semconv.HTTPResponseStatusCode(statusCode))
-	attrOpt := metric.WithAttributeSet(attribute.NewSet(attrM...))
+	filler := noSemConvMetricsFiller
+	if versionFiller, ok := supportedSemConv[metricsOpts.SemConv]; ok {
+		filler = versionFiller
+	}
+	filler(metricsOpts, meter, &tm)
+	return &tm
+}
 
+func (m *transportMetrics) report(rtt *roundTripTracking, attrs []attribute.KeyValue) {
+	if m == nil || m.requestsStarted == nil {
+		return
+	}
+	attrOpt := m.attributesOption(rtt, attrs)
 	ctx := rtt.req.Context()
 
 	m.requestsStarted.Add(ctx, 1, attrOpt)
 	if rtt.req.ContentLength >= 0 {
-		// TOOD: should we check the http verb / method to report this ?
 		m.requestContentLength.Add(ctx, rtt.req.ContentLength, attrOpt)
+		// the content-length is optional and experimental for 1.27 and also 1.29 sem conv:
+		// https://opentelemetry.io/docs/specs/semconv/http/http-metrics/#metric-httpclientrequestbodysize
+		m.requestContentLengthHist.Record(ctx, rtt.req.ContentLength, attrOpt)
 	}
 
 	if rtt.err != nil {
@@ -128,11 +202,15 @@ func (m *transportMetrics) report(rtt *roundTripTracking, attrs []attribute.KeyV
 		}
 	}
 
+	// the `http.client.request.duration` is required for semconv 1.27 and 1.29
 	m.responseLatency.Record(ctx, rtt.latencyInSecs, attrOpt)
+
 	if rtt.req.Method != "HEAD" && rtt.resp != nil {
 		if rtt.resp.ContentLength >= 0 {
 			// it might be the case were we receive a chunked response, and then
 			// we will not record a metric for it.
+			// the `http.client.response.body.size` is optional and experimental
+			// for semconv 1.27 and 1.29
 			m.responseContentLength.Record(ctx, rtt.resp.ContentLength, attrOpt)
 		} else {
 			m.responseNoContentLength.Add(ctx, 1, attrOpt)
@@ -145,3 +223,45 @@ func (m *transportMetrics) report(rtt *roundTripTracking, attrs []attribute.KeyV
 		m.tlsLatency.Record(ctx, rtt.tlsLatency, attrOpt)
 	}
 }
+
+func (m *transportMetrics) attributesOption(rtt *roundTripTracking, attrs []attribute.KeyValue) metric.MeasurementOption {
+	numAttrs := len(attrs) + 4 + 1 // static attrs + required attributes + clientname
+	attrM := make([]attribute.KeyValue, len(attrs), numAttrs)
+	copy(attrM, attrs)
+	if len(m.clientName) > 0 {
+		attrM = append(attrM, attribute.Key("clientname").String(m.clientName))
+	}
+
+	serverAddress, serverPort := requestServerAndPort(rtt.req)
+
+	statusCode := 0
+	if rtt.err == nil {
+		// if we fail on the client side, we do not have a status code, but we
+		// want it set to 0 to be displayed on the dashboard
+		statusCode = int(rtt.resp.StatusCode)
+	}
+
+	attrM = append(attrM,
+		semconv.HTTPRequestMethodKey.String(rtt.req.Method), // required
+		// this is wrong, as the RemoteAddr is ignored when the request is used
+		// for a client (is filled by the server side):
+		// semconv.ServerAddress(rtt.req.RemoteAddr),
+		semconv.ServerAddress(serverAddress),       // required by sem conv 1.29
+		semconv.ServerPort(serverPort),             // required by sem conv 1.29
+		semconv.HTTPResponseStatusCode(statusCode), // required if received
+	)
+	return metric.WithAttributeSet(attribute.NewSet(attrM...))
+}
+
+func requestServerAndPort(r *http.Request) (string, int) {
+	serverAddress := r.Host
+	serverPort := int(80)
+	if r.URL != nil {
+		serverAddress = r.URL.Hostname()
+		strPort := r.URL.Port()
+		if p, err := strconv.ParseInt(strPort, 10, 32); err != nil {
+			serverPort = int(p)
+		}
+	}
+	return serverAddress, serverPort
+}