storage: make CSIInlineVolume a beta feature

The feature is complete and supported by an increasing number of CSI
drivers, but before it can be really used, it should be moved out of
alpha into beta.

Author: pohly

api/openapi-spec/swagger.json

@@ -316,6 +316,7 @@ const (
 
 	// owner: @vladimirvivien
 	// alpha: v1.14
+	// beta: v1.16
 	//
 	// Enables CSI Inline volumes support for pods
 	CSIInlineVolume featuregate.Feature = "CSIInlineVolume"
@@ -529,7 +530,7 @@ var defaultKubernetesFeatureGates = map[featuregate.Feature]featuregate.FeatureS
 	VolumeSubpathEnvExpansion:           {Default: true, PreRelease: featuregate.Beta},
 	ResourceQuotaScopeSelectors:         {Default: true, PreRelease: featuregate.Beta},
 	CSIBlockVolume:                      {Default: true, PreRelease: featuregate.Beta},
-	CSIInlineVolume:                     {Default: false, PreRelease: featuregate.Alpha},
+	CSIInlineVolume:                     {Default: true, PreRelease: featuregate.Beta},
 	RuntimeClass:                        {Default: true, PreRelease: featuregate.Beta},
 	NodeLease:                           {Default: true, PreRelease: featuregate.Beta},
 	SCTPSupport:                         {Default: false, PreRelease: featuregate.Alpha},

pkg/features/kube_features.go

@@ -930,7 +930,6 @@ type PodSecurityPolicySpec struct {
 	AllowedFlexVolumes []AllowedFlexVolume `json:"allowedFlexVolumes,omitempty" protobuf:"bytes,18,rep,name=allowedFlexVolumes"`
 	// AllowedCSIDrivers is a whitelist of inline CSI drivers that must be explicitly set to be embedded within a pod spec.
 	// An empty value indicates that any CSI driver can be used for inline ephemeral volumes.
-	// This is an alpha field, and is only honored if the API server enables the CSIInlineVolume feature gate.
 	// +optional
 	AllowedCSIDrivers []AllowedCSIDriver `json:"allowedCSIDrivers,omitempty" protobuf:"bytes,23,rep,name=allowedCSIDrivers"`
 	// allowedUnsafeSysctls is a list of explicitly allowed unsafe sysctls, defaults to none.

staging/src/k8s.io/api/extensions/v1beta1/generated.proto

@@ -322,8 +322,7 @@ var _ = utils.SIGDescribe("CSI mock volume", func() {
 				expectEphemeral:        false,
 			},
 			{
-				// TODO(pohly): remove the feature tag when moving to beta
-				name:                   "contain ephemeral=true when using inline volume [Feature:CSIInlineVolume]",
+				name:                   "contain ephemeral=true when using inline volume",
 				podInfoOnMount:         &podInfoTrue,
 				deployClusterRegistrar: true,
 				expectPodInfo:          true,

staging/src/k8s.io/api/extensions/v1beta1/types.go

@@ -42,7 +42,7 @@ var _ TestSuite = &ephemeralTestSuite{}
 func InitEphemeralTestSuite() TestSuite {
 	return &ephemeralTestSuite{
 		tsInfo: TestSuiteInfo{
-			name: "ephemeral [Feature:CSIInlineVolume]",
+			name: "ephemeral",
 			testPatterns: []testpatterns.TestPattern{
 				{
 					Name:    "inline ephemeral CSI volume",