Add subresource to apiserver tracing

staging/src/k8s.io/apiserver/pkg/endpoints/handlers/helpers.go

@@ -131,6 +131,24 @@ func (lazy *lazyName) String() string {
 	return "unknown"
 }
 
+// lazySubresource implements String() string and it will
+// lazily get Group from request info.
+type lazySubresource struct {
+	req *http.Request
+}
+
+func (lazy *lazySubresource) String() string {
+	if lazy.req != nil {
+		ctx := lazy.req.Context()
+		requestInfo, ok := apirequest.RequestInfoFrom(ctx)
+		if ok {
+			return requestInfo.Subresource
+		}
+	}
+
+	return "unknown"
+}
+
 // lazyAuditID implements Stringer interface to lazily retrieve
 // the audit ID associated with the request.
 type lazyAuditID struct {

staging/src/k8s.io/apiserver/pkg/endpoints/handlers/helpers_test.go

@@ -121,6 +121,18 @@ func TestLazyName(t *testing.T) {
 	assert.Equal(t, "jaeger-76d45d6876-vqp8t", fmt.Sprintf("%v", scopeWithReq))
 }
 
+func TestLazySubresource(t *testing.T) {
+	assert.Equal(t, "unknown", fmt.Sprintf("%v", &lazySubresource{}))
+
+	scopeWithEmptyReq := &lazySubresource{&http.Request{}}
+	assert.Equal(t, "unknown", fmt.Sprintf("%v", scopeWithEmptyReq))
+
+	req := &http.Request{}
+	ctx := request.WithRequestInfo(context.TODO(), &request.RequestInfo{Subresource: "binding"})
+	scopeWithReq := &lazySubresource{req: req.WithContext(ctx)}
+	assert.Equal(t, "binding", fmt.Sprintf("%v", scopeWithReq))
+}
+
 func TestLazyResource(t *testing.T) {
 	assert.Equal(t, "unknown", fmt.Sprintf("%v", &lazyResource{}))
 

staging/src/k8s.io/apiserver/pkg/endpoints/handlers/trace_util.go

@@ -30,6 +30,7 @@ func traceFields(req *http.Request) []attribute.KeyValue {
 		attribute.Stringer("api-group", &lazyAPIGroup{req: req}),
 		attribute.Stringer("api-version", &lazyAPIVersion{req: req}),
 		attribute.Stringer("name", &lazyName{req: req}),
+		attribute.Stringer("subresource", &lazySubresource{req: req}),
 		attribute.String("protocol", req.Proto),
 		attribute.Stringer("resource", &lazyResource{req: req}),
 		attribute.Stringer("scope", &lazyScope{req: req}),