Add sdk language to span metrics

internal/test/integration/red_test.go

@@ -128,7 +128,8 @@ func testSpanMetricsForHTTPLibraryOTelFormat(t *testing.T, svcName, svcNs string
 			`status_code="STATUS_CODE_UNSET",` + // 404 is OK for server spans
 			`service_namespace="` + svcNs + `",` +
 			`service_name="` + svcName + `",` +
-			`span_name="GET /basic/:rnd"` +
+			`span_name="GET /basic/:rnd",` +
+			`telemetry_sdk_language="go"` +
 			`}`)
 		require.NoError(t, err)
 		// check span metric latency exists
@@ -180,7 +181,8 @@ func testSpanMetricsForHTTPLibrary(t *testing.T, svcName, svcNs string) {
 			`status_code="STATUS_CODE_UNSET",` + // 404 is OK for server spans
 			`service_namespace="` + svcNs + `",` +
 			`service_name="` + svcName + `",` +
-			`span_name="GET /basic/:rnd"` +
+			`span_name="GET /basic/:rnd",` +
+			`telemetry_sdk_language="go"` +
 			`}`)
 		require.NoError(t, err)
 		// check span metric latency exists

pkg/appolly/app/request/span_getters.go

@@ -91,6 +91,10 @@ func spanOTELGetters(name attr.Name) (attributes.Getter[*Span, attribute.KeyValu
 		getter = func(s *Span) attribute.KeyValue { return SpanNameMetric(s.TraceName()) }
 	case attr.Source:
 		getter = func(_ *Span) attribute.KeyValue { return SourceMetric(attr.VendorPrefix) }
+	case attr.TelemetrySDKLanguage:
+		getter = func(s *Span) attribute.KeyValue {
+			return semconv.TelemetrySDKLanguageKey.String(s.Service.SDKLanguage.String())
+		}
 	case attr.StatusCode:
 		getter = func(s *Span) attribute.KeyValue { return StatusCodeMetric(SpanStatusCode(s)) }
 	case attr.DBOperation:

pkg/export/attributes/attr_defs.go

@@ -337,17 +337,18 @@ func getDefinitions(
 		// TODO: when service graph and span metrics implement attribute selection, replace this section by proper metric names
 		"---- temporary placeholder for span and service graph metrics ----": {
 			Attributes: map[attr.Name]Default{
-				attr.Client:            false,
-				attr.ClientNamespace:   false,
-				attr.Server:            false,
-				attr.ServerNamespace:   false,
-				attr.Source:            false,
-				attr.ServiceName:       false,
-				attr.ServiceInstanceID: false,
-				attr.ServiceNamespace:  false,
-				attr.SpanKind:          false,
-				attr.SpanName:          false,
-				attr.StatusCode:        false,
+				attr.Client:               false,
+				attr.ClientNamespace:      false,
+				attr.Server:               false,
+				attr.ServerNamespace:      false,
+				attr.Source:               false,
+				attr.ServiceName:          false,
+				attr.ServiceInstanceID:    false,
+				attr.ServiceNamespace:     false,
+				attr.SpanKind:             false,
+				attr.SpanName:             false,
+				attr.StatusCode:           false,
+				attr.TelemetrySDKLanguage: false,
 			},
 		},
 	}

pkg/export/attributes/names/attrs.go

@@ -63,6 +63,7 @@ const (
 	GraphQLOperationType   = Name(semconv.GraphqlOperationTypeKey)
 	DNSAnswers             = Name("dns.answers")
 	ErrorMessage           = Name("error.message")
+	TelemetrySDKLanguage   = Name(semconv.TelemetrySDKLanguageKey)
 
 	K8sNamespaceName   = Name("k8s.namespace.name")
 	K8sPodName         = Name("k8s.pod.name")

pkg/export/otel/metrics.go

@@ -789,6 +789,7 @@ func (mr *MetricsReporter) spanMetricAttributes() []attributes.Field[*request.Sp
 			attr.SpanName,
 			attr.StatusCode,
 			attr.Source,
+			attr.TelemetrySDKLanguage,
 		}),
 		// hostID is not taken from the span but common to the metrics reporter,
 		// so the getter is injected here directly

pkg/export/prom/prom.go

@@ -1037,7 +1037,7 @@ func appendK8sLabelValuesService(values []string, service *svc.Attrs) []string {
 }
 
 func labelNamesSpans() []string {
-	return []string{serviceNameKey, serviceNamespaceKey, spanNameKey, statusCodeKey, spanKindKey, serviceInstanceKey, serviceJobKey, sourceKey}
+	return []string{serviceNameKey, serviceNamespaceKey, spanNameKey, statusCodeKey, spanKindKey, serviceInstanceKey, serviceJobKey, sourceKey, telemetryLanguageKey}
 }
 
 func (r *metricsReporter) labelValuesSpans(span *request.Span) []string {
@@ -1050,6 +1050,7 @@ func (r *metricsReporter) labelValuesSpans(span *request.Span) []string {
 		span.Service.UID.Instance, // app instance ID
 		span.Service.Job(),
 		attr.VendorPrefix,
+		span.Service.SDKLanguage.String(),
 	}
 }