rename apiserver trace span to http server guidelines

Signed-off-by: Ziqi Zhao <zhaoziqi9146@gmail.com>

staging/src/k8s.io/apiserver/pkg/endpoints/filters/traces.go

@@ -22,6 +22,7 @@ import (
 	"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
 	semconv "go.opentelemetry.io/otel/semconv/v1.17.0"
 	"go.opentelemetry.io/otel/trace"
+	"k8s.io/apiserver/pkg/endpoints/request"
 
 	tracing "k8s.io/component-base/tracing"
 )
@@ -32,6 +33,14 @@ func WithTracing(handler http.Handler, tp trace.TracerProvider) http.Handler {
 		otelhttp.WithPropagators(tracing.Propagators()),
 		otelhttp.WithPublicEndpoint(),
 		otelhttp.WithTracerProvider(tp),
+		otelhttp.WithSpanNameFormatter(func(operation string, r *http.Request) string {
+			ctx := r.Context()
+			info, exist := request.RequestInfoFrom(ctx)
+			if !exist {
+				return "KubernetesAPI"
+			}
+			return getSpanNameFromRequestInfo(info)
+		}),
 	}
 	wrappedHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		// Add the http.target attribute to the otelhttp span
@@ -45,3 +54,22 @@ func WithTracing(handler http.Handler, tp trace.TracerProvider) http.Handler {
 	// See https://github.com/open-telemetry/opentelemetry-go/tree/main/example/passthrough
 	return otelhttp.NewHandler(wrappedHandler, "KubernetesAPI", opts...)
 }
+
+func getSpanNameFromRequestInfo(info *request.RequestInfo) string {
+	spanName := "/" + info.APIPrefix
+	if info.APIGroup != "" {
+		spanName += "/" + info.APIGroup
+	}
+	spanName += "/" + info.APIVersion
+	if info.Namespace != "" {
+		spanName += "/namespaces/{:namespace}"
+	}
+	spanName += "/" + info.Resource
+	if info.Name != "" {
+		spanName += "/" + "{:id}"
+	}
+	if info.Subresource != "" {
+		spanName += "/" + info.Subresource
+	}
+	return spanName
+}