Merge pull request #56849 from hzxuzhonghu/lifecycle-admission

Automatic merge from submit-queue (batch tested with PRs 56828, 55184, 56849, 57081, 56654). 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 dead code in lifecycle admission

**What this PR does / why we need it**:

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

staging/src/k8s.io/apiserver/pkg/admission/plugin/namespace/lifecycle/admission.go

@@ -69,22 +69,9 @@ type Lifecycle struct {
 	forceLiveLookupCache *utilcache.LRUExpireCache
 }
 
-type forceLiveLookupEntry struct {
-	expiry time.Time
-}
-
 var _ = initializer.WantsExternalKubeInformerFactory(&Lifecycle{})
 var _ = initializer.WantsExternalKubeClientSet(&Lifecycle{})
 
-func makeNamespaceKey(namespace string) *v1.Namespace {
-	return &v1.Namespace{
-		ObjectMeta: metav1.ObjectMeta{
-			Name:      namespace,
-			Namespace: "",
-		},
-	}
-}
-
 func (l *Lifecycle) Admit(a admission.Attributes) error {
 	// prevent deletion of immortal namespaces
 	if a.GetOperation() == admission.Delete && a.GetKind().GroupKind() == v1.SchemeGroupVersion.WithKind("Namespace").GroupKind() && l.immortalNamespaces.Has(a.GetName()) {
@@ -182,7 +169,7 @@ func (l *Lifecycle) Admit(a admission.Attributes) error {
 		}
 
 		// TODO: This should probably not be a 403
-		return admission.NewForbidden(a, fmt.Errorf("unable to create new content in namespace %s because it is being terminated.", a.GetNamespace()))
+		return admission.NewForbidden(a, fmt.Errorf("unable to create new content in namespace %s because it is being terminated", a.GetNamespace()))
 	}
 
 	return nil