Merge pull request #58485 from k82cn/k8s_58471

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>.

Updated priority of mirror pod by PriorityClass.

Signed-off-by: Da K. Ma <madaxa@cn.ibm.com>

**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 #58471 

**Release note**:
```release-note
Updated priority of mirror pod according to PriorityClassName.
```

plugin/pkg/admission/priority/admission.go

@@ -157,9 +157,7 @@ func (p *PriorityPlugin) admitPod(a admission.Attributes) error {
 	if !ok {
 		return errors.NewBadRequest("resource was marked with kind Pod but was unable to be converted")
 	}
-	if _, isMirrorPod := pod.Annotations[api.MirrorPodAnnotationKey]; isMirrorPod {
-		return nil
-	}
+
 	// Make sure that the client has not set `priority` at the time of pod creation.
 	if operation == admission.Create && pod.Spec.Priority != nil {
 		return admission.NewForbidden(a, fmt.Errorf("the integer value of priority must not be provided in pod spec. Priority admission controller populates the value from the given PriorityClass name"))

plugin/pkg/admission/priority/admission_test.go

@@ -316,6 +316,39 @@ func TestPodAdmission(t *testing.T) {
 				PriorityClassName: "system-cluster-critical",
 			},
 		},
+		// pod[5]: mirror Pod with a system priority class name
+		{
+			ObjectMeta: metav1.ObjectMeta{
+				Name:        "mirror-pod-w-system-priority",
+				Namespace:   "namespace",
+				Annotations: map[string]string{api.MirrorPodAnnotationKey: ""},
+			},
+			Spec: api.PodSpec{
+				Containers: []api.Container{
+					{
+						Name: containerName,
+					},
+				},
+				PriorityClassName: "system-cluster-critical",
+			},
+		},
+		// pod[6]: mirror Pod with integer value of priority
+		{
+			ObjectMeta: metav1.ObjectMeta{
+				Name:        "mirror-pod-w-integer-priority",
+				Namespace:   "namespace",
+				Annotations: map[string]string{api.MirrorPodAnnotationKey: ""},
+			},
+			Spec: api.PodSpec{
+				Containers: []api.Container{
+					{
+						Name: containerName,
+					},
+				},
+				PriorityClassName: "default1",
+				Priority:          &intPriority,
+			},
+		},
 	}
 	// Enable PodPriority feature gate.
 	utilfeature.DefaultFeatureGate.Set(fmt.Sprintf("%s=true", features.PodPriority))
@@ -378,6 +411,20 @@ func TestPodAdmission(t *testing.T) {
 			0,
 			true,
 		},
+		{
+			"mirror pod with system priority class",
+			[]*scheduling.PriorityClass{},
+			*pods[5],
+			SystemCriticalPriority,
+			false,
+		},
+		{
+			"mirror pod with integer priority",
+			[]*scheduling.PriorityClass{},
+			*pods[6],
+			0,
+			true,
+		},
 	}
 
 	for _, test := range tests {