Make the timeout error more specific so users can find it

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

@@ -202,7 +202,7 @@ func finishRequest(timeout time.Duration, fn resultFunc) (result runtime.Object,
 	case p := <-panicCh:
 		panic(p)
 	case <-time.After(timeout):
-		return nil, errors.NewTimeoutError("request did not complete within allowed duration", 0)
+		return nil, errors.NewTimeoutError(fmt.Sprintf("request did not complete within requested timeout %s", timeout), 0)
 	}
 }
 

test/e2e/apimachinery/webhook.go

@@ -576,7 +576,7 @@ func testWebhook(f *framework.Framework) {
 	pod = hangingPod(f)
 	_, err = client.CoreV1().Pods(f.Namespace.Name).Create(pod)
 	Expect(err).NotTo(BeNil())
-	expectedTimeoutErr := "request did not complete within allowed duration"
+	expectedTimeoutErr := "Timeout: request did not complete within requested timeout 30s"
 	if !strings.Contains(err.Error(), expectedTimeoutErr) {
 		framework.Failf("expect timeout error %q, got %q", expectedTimeoutErr, err.Error())
 	}