Remove KubeletPluginsWatcher feature gate

The feature gate was already beta in 1.13 (least supported version of
Alicloud/Packet which were using it) and enabled by default, it
graduated to GA in 1.14. We never needed to explicitly enable it, we
just have to make sure that it's not disabled.

See kubernetes/kubernetes#79310

controllers/provider-alicloud/pkg/webhook/controlplane/ensurer.go

@@ -79,8 +79,6 @@ func ensureKubeAPIServerCommandLineArgs(c *corev1.Container) {
 		"CSINodeInfo=true", ",")
 	c.Command = extensionswebhook.EnsureStringWithPrefixContains(c.Command, "--feature-gates=",
 		"CSIDriverRegistry=true", ",")
-	c.Command = extensionswebhook.EnsureStringWithPrefixContains(c.Command, "--feature-gates=",
-		"KubeletPluginsWatcher=true", ",")
 }
 
 func ensureKubeControllerManagerCommandLineArgs(c *corev1.Container) {
@@ -113,6 +111,5 @@ func (e *ensurer) EnsureKubeletConfiguration(ctx context.Context, kubeletConfig
 	kubeletConfig.FeatureGates["VolumeSnapshotDataSource"] = true
 	kubeletConfig.FeatureGates["CSINodeInfo"] = true
 	kubeletConfig.FeatureGates["CSIDriverRegistry"] = true
-	kubeletConfig.FeatureGates["KubeletPluginsWatcher"] = true
 	return nil
 }

controllers/provider-alicloud/pkg/webhook/controlplane/ensurer_test.go

@@ -218,7 +218,6 @@ var _ = Describe("Ensurer", func() {
 						"VolumeSnapshotDataSource": true,
 						"CSINodeInfo":              true,
 						"CSIDriverRegistry":        true,
-						"KubeletPluginsWatcher":    true,
 					},
 				}
 			)
@@ -245,7 +244,6 @@ func checkKubeAPIServerDeployment(dep *appsv1.Deployment) {
 	Expect(c.Command).To(test.ContainElementWithPrefixContaining("--feature-gates=", "VolumeSnapshotDataSource=true", ","))
 	Expect(c.Command).To(test.ContainElementWithPrefixContaining("--feature-gates=", "CSINodeInfo=true", ","))
 	Expect(c.Command).To(test.ContainElementWithPrefixContaining("--feature-gates=", "CSIDriverRegistry=true", ","))
-	Expect(c.Command).To(test.ContainElementWithPrefixContaining("--feature-gates=", "KubeletPluginsWatcher=true", ","))
 }
 
 func checkKubeControllerManagerDeployment(dep *appsv1.Deployment) {

controllers/provider-packet/pkg/webhook/controlplane/ensurer.go

@@ -91,8 +91,6 @@ func ensureKubeAPIServerCommandLineArgs(c *corev1.Container) {
 		"CSINodeInfo=true", ",")
 	c.Command = extensionswebhook.EnsureStringWithPrefixContains(c.Command, "--feature-gates=",
 		"CSIDriverRegistry=true", ",")
-	c.Command = extensionswebhook.EnsureStringWithPrefixContains(c.Command, "--feature-gates=",
-		"KubeletPluginsWatcher=true", ",")
 }
 
 func ensureKubeControllerManagerCommandLineArgs(c *corev1.Container) {
@@ -142,6 +140,5 @@ func (e *ensurer) EnsureKubeletConfiguration(ctx context.Context, kubeletConfig
 	kubeletConfig.FeatureGates["VolumeSnapshotDataSource"] = true
 	kubeletConfig.FeatureGates["CSINodeInfo"] = true
 	kubeletConfig.FeatureGates["CSIDriverRegistry"] = true
-	kubeletConfig.FeatureGates["KubeletPluginsWatcher"] = true
 	return nil
 }

controllers/provider-packet/pkg/webhook/controlplane/ensurer_test.go

@@ -253,7 +253,6 @@ var _ = Describe("Ensurer", func() {
 						"VolumeSnapshotDataSource": true,
 						"CSINodeInfo":              true,
 						"CSIDriverRegistry":        true,
-						"KubeletPluginsWatcher":    true,
 					},
 				}
 			)
@@ -280,7 +279,6 @@ func checkKubeAPIServerDeployment(dep *appsv1.Deployment, annotations map[string
 	Expect(c.Command).To(test.ContainElementWithPrefixContaining("--feature-gates=", "VolumeSnapshotDataSource=true", ","))
 	Expect(c.Command).To(test.ContainElementWithPrefixContaining("--feature-gates=", "CSINodeInfo=true", ","))
 	Expect(c.Command).To(test.ContainElementWithPrefixContaining("--feature-gates=", "CSIDriverRegistry=true", ","))
-	Expect(c.Command).To(test.ContainElementWithPrefixContaining("--feature-gates=", "KubeletPluginsWatcher=true", ","))
 
 	// Check that the Pod template contains all needed checksum annotations
 	Expect(dep.Spec.Template.Annotations).To(Equal(annotations))