Merge pull request #53766 from liggitt/ui-redirect

Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Remove /ui/ redirect

The existing kube-apiserver hard-codes `/ui` to redirect to an optional add-on, which is not appropriate. It does not work in the following scenarios:
* https-enabled dashboards
* the dashboard is deployed to a different namespace or service name
* the dashboard is not installed at all
* authorization is enabled and does not allow access to /ui

This PR removes the hard-coded `/ui` redirect.

```release-note
apiserver: the /ui kube-dashboard redirect has been removed. Follow instructions specific to your deployment to access kube-dashboard
```

test/e2e/ui/dashboard.go

@@ -86,16 +86,5 @@ var _ = SIGDescribe("Kubernetes Dashboard", func() {
 			return status == http.StatusOK, nil
 		})
 		Expect(err).NotTo(HaveOccurred())
-
-		By("Checking that the ApiServer /ui endpoint redirects to a valid server.")
-		var status int
-		err = f.ClientSet.CoreV1().RESTClient().Get().
-			AbsPath(uiRedirect).
-			Timeout(framework.SingleCallTimeout).
-			Do().
-			StatusCode(&status).
-			Error()
-		Expect(err).NotTo(HaveOccurred())
-		Expect(status).To(Equal(http.StatusOK), "Unexpected status from /ui")
 	})
 })

test/integration/openshift/openshift_test.go

@@ -32,7 +32,6 @@ func TestMasterExportsSymbols(t *testing.T) {
 		},
 		ExtraConfig: master.ExtraConfig{
 			EnableCoreControllers: false,
-			EnableUISupport:       false,
 			EnableLogsSupport:     false,
 		},
 	}