Add Validation to versioned feature specs.

Co-authored-by: Jordan Liggitt <liggitt@google.com>
Co-authored-by: Siyuan Zhang <sizhang@google.com>

Signed-off-by: Siyuan Zhang <sizhang@google.com>

cmd/kube-controller-manager/app/options/options_test.go

@@ -747,8 +747,8 @@ func TestEmulatedVersion(t *testing.T) {
 		fg := featuregate.NewVersionedFeatureGate(version.MustParse("1.32"))
 		utilruntime.Must(fg.AddVersioned(map[featuregate.Feature]featuregate.VersionedSpecs{
 			"kubeA": {
-				{Version: version.MustParse("1.32"), Default: true, LockToDefault: true, PreRelease: featuregate.GA},
 				{Version: version.MustParse("1.30"), Default: false, PreRelease: featuregate.Beta},
+				{Version: version.MustParse("1.32"), Default: true, LockToDefault: true, PreRelease: featuregate.GA},
 			},
 			"kubeB": {
 				{Version: version.MustParse("1.31"), Default: false, PreRelease: featuregate.Alpha},

cmd/kube-scheduler/app/server_test.go

@@ -29,6 +29,7 @@ import (
 
 	"github.com/google/go-cmp/cmp"
 	"github.com/spf13/pflag"
+
 	v1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime"
@@ -446,8 +447,8 @@ leaderElection:
 			fg := feature.DefaultFeatureGate.DeepCopy()
 			utilruntime.Must(fg.AddVersioned(map[featuregate.Feature]featuregate.VersionedSpecs{
 				"kubeA": {
-					{Version: version.MustParse("1.32"), Default: true, LockToDefault: true, PreRelease: featuregate.GA},
 					{Version: version.MustParse("1.30"), Default: false, PreRelease: featuregate.Beta},
+					{Version: version.MustParse("1.32"), Default: true, LockToDefault: true, PreRelease: featuregate.GA},
 				},
 				"kubeB": {
 					{Version: version.MustParse("1.31"), Default: false, PreRelease: featuregate.Alpha},

pkg/features/versioned_kube_features.go

@@ -37,18 +37,22 @@ import (
 // Entries are alphabetized.
 var defaultVersionedKubernetesFeatureGates = map[featuregate.Feature]featuregate.VersionedSpecs{
 	AllowDNSOnlyNodeCSR: {
+		{Version: version.MustParse("1.0"), Default: true, PreRelease: featuregate.GA},
 		{Version: version.MustParse("1.31"), Default: false, PreRelease: featuregate.Deprecated},
 	},
 
 	AllowInsecureKubeletCertificateSigningRequests: {
+		{Version: version.MustParse("1.0"), Default: true, PreRelease: featuregate.GA},
 		{Version: version.MustParse("1.31"), Default: false, PreRelease: featuregate.Deprecated},
 	},
 
 	AllowOverwriteTerminationGracePeriodSeconds: {
+		{Version: version.MustParse("1.0"), Default: true, PreRelease: featuregate.GA},
 		{Version: version.MustParse("1.32"), Default: false, PreRelease: featuregate.Deprecated},
 	},
 
 	AllowServiceLBStatusOnNonLB: {
+		{Version: version.MustParse("1.0"), Default: true, PreRelease: featuregate.GA},
 		{Version: version.MustParse("1.29"), Default: false, PreRelease: featuregate.Deprecated},
 		{Version: version.MustParse("1.32"), Default: false, PreRelease: featuregate.Deprecated, LockToDefault: true}, // remove in 1.35
 	},
@@ -291,6 +295,7 @@ var defaultVersionedKubernetesFeatureGates = map[featuregate.Feature]featuregate
 	},
 
 	genericfeatures.KMSv1: {
+		{Version: version.MustParse("1.0"), Default: true, PreRelease: featuregate.GA},
 		{Version: version.MustParse("1.28"), Default: true, PreRelease: featuregate.Deprecated},
 		{Version: version.MustParse("1.29"), Default: false, PreRelease: featuregate.Deprecated},
 	},
@@ -474,6 +479,7 @@ var defaultVersionedKubernetesFeatureGates = map[featuregate.Feature]featuregate
 	},
 
 	KubeletRegistrationGetOnExistsOnly: {
+		{Version: version.MustParse("1.0"), Default: true, PreRelease: featuregate.GA},
 		{Version: version.MustParse("1.32"), Default: false, PreRelease: featuregate.Deprecated},
 	},
 

staging/src/k8s.io/apiserver/pkg/features/kube_features.go

@@ -356,6 +356,7 @@ var defaultVersionedKubernetesFeatureGates = map[featuregate.Feature]featuregate
 	},
 
 	KMSv1: {
+		{Version: version.MustParse("1.0"), Default: true, PreRelease: featuregate.GA},
 		{Version: version.MustParse("1.28"), Default: true, PreRelease: featuregate.Deprecated},
 		{Version: version.MustParse("1.29"), Default: false, PreRelease: featuregate.Deprecated},
 	},

staging/src/k8s.io/component-base/featuregate/feature_gate.go

@@ -318,7 +318,6 @@ func (f *featureGate) unsafeSetFromMap(enabled map[Feature]bool, m map[string]bo
 	// Copy existing state
 	known := map[Feature]VersionedSpecs{}
 	for k, v := range f.known.Load().(map[Feature]VersionedSpecs) {
-		sort.Sort(v)
 		known[k] = v
 	}
 
@@ -421,19 +420,52 @@ func (f *featureGate) AddVersioned(features map[Feature]VersionedSpecs) error {
 	if f.closed {
 		return fmt.Errorf("cannot add a feature gate after adding it to the flag set")
 	}
-
 	// Copy existing state
 	known := f.GetAllVersioned()
 
 	for name, specs := range features {
-		sort.Sort(specs)
 		if existingSpec, found := known[name]; found {
-			sort.Sort(existingSpec)
 			if reflect.DeepEqual(existingSpec, specs) {
 				continue
 			}
 			return fmt.Errorf("feature gate %q with different spec already exists: %v", name, existingSpec)
 		}
+		// Validate new specs are well-formed
+		var lastVersion *version.Version
+		var wasBeta, wasGA, wasDeprecated bool
+		for i, spec := range specs {
+			if spec.Version == nil {
+				return fmt.Errorf("feature %q did not provide a version", name)
+			}
+			if len(spec.Version.Components()) != 2 {
+				return fmt.Errorf("feature %q specified patch version: %s", name, spec.Version.String())
+
+			}
+			// gates that begin as deprecated must indicate their prior state
+			if i == 0 && spec.PreRelease == Deprecated && spec.Version.Minor() != 0 {
+				return fmt.Errorf("feature %q introduced as deprecated must provide a 1.0 entry indicating initial state", name)
+			}
+			if i > 0 {
+				// versions must strictly increase
+				if !lastVersion.LessThan(spec.Version) {
+					return fmt.Errorf("feature %q lists version transitions in non-increasing order (%s <= %s)", name, spec.Version, lastVersion)
+				}
+				// stability must not regress from ga --> {beta,alpha} or beta --> alpha, and
+				// Deprecated state must be the terminal state
+				switch {
+				case spec.PreRelease != Deprecated && wasDeprecated:
+					return fmt.Errorf("deprecated feature %q must not resurrect from its terminal state", name)
+				case spec.PreRelease == Alpha && (wasBeta || wasGA):
+					return fmt.Errorf("feature %q regresses stability from more stable level to %s in %s", name, spec.PreRelease, spec.Version)
+				case spec.PreRelease == Beta && wasGA:
+					return fmt.Errorf("feature %q regresses stability from more stable level to %s in %s", name, spec.PreRelease, spec.Version)
+				}
+			}
+			lastVersion = spec.Version
+			wasBeta = wasBeta || spec.PreRelease == Beta
+			wasGA = wasGA || spec.PreRelease == GA
+			wasDeprecated = wasDeprecated || spec.PreRelease == Deprecated
+		}
 		known[name] = specs
 	}
 

staging/src/k8s.io/component-base/featuregate/feature_gate_test.go

@@ -1017,20 +1017,20 @@ func TestVersionedFeatureGateFlag(t *testing.T) {
 			}
 			err := f.AddVersioned(map[Feature]VersionedSpecs{
 				testGAGate: {
-					{Version: version.MustParse("1.29"), Default: true, PreRelease: GA},
-					{Version: version.MustParse("1.28"), Default: false, PreRelease: Beta},
 					{Version: version.MustParse("1.27"), Default: false, PreRelease: Alpha},
+					{Version: version.MustParse("1.28"), Default: false, PreRelease: Beta},
+					{Version: version.MustParse("1.29"), Default: true, PreRelease: GA},
 				},
 				testAlphaGate: {
 					{Version: version.MustParse("1.29"), Default: false, PreRelease: Alpha},
 				},
 				testBetaGate: {
-					{Version: version.MustParse("1.29"), Default: false, PreRelease: Beta},
 					{Version: version.MustParse("1.28"), Default: false, PreRelease: Alpha},
+					{Version: version.MustParse("1.29"), Default: false, PreRelease: Beta},
 				},
 				testLockedFalseGate: {
-					{Version: version.MustParse("1.29"), Default: false, PreRelease: GA, LockToDefault: true},
 					{Version: version.MustParse("1.28"), Default: false, PreRelease: GA},
+					{Version: version.MustParse("1.29"), Default: false, PreRelease: GA, LockToDefault: true},
 				},
 			})
 			require.NoError(t, err)
@@ -1076,8 +1076,8 @@ func TestVersionedFeatureGateOverride(t *testing.T) {
 			{Version: version.MustParse("1.29"), Default: false, PreRelease: Alpha},
 		},
 		testBetaGate: {
-			{Version: version.MustParse("1.29"), Default: false, PreRelease: Beta},
 			{Version: version.MustParse("1.28"), Default: false, PreRelease: Alpha},
+			{Version: version.MustParse("1.29"), Default: false, PreRelease: Beta},
 		},
 	})
 	require.NoError(t, err)
@@ -1127,17 +1127,17 @@ func TestVersionedFeatureGateFlagDefaults(t *testing.T) {
 
 	err := f.AddVersioned(map[Feature]VersionedSpecs{
 		testGAGate: {
-			{Version: version.MustParse("1.29"), Default: true, PreRelease: GA},
-			{Version: version.MustParse("1.27"), Default: true, PreRelease: Beta},
 			{Version: version.MustParse("1.25"), Default: true, PreRelease: Alpha},
+			{Version: version.MustParse("1.27"), Default: true, PreRelease: Beta},
+			{Version: version.MustParse("1.29"), Default: true, PreRelease: GA},
 		},
 		testAlphaGate: {
 			{Version: version.MustParse("1.29"), Default: false, PreRelease: Alpha},
 		},
 		testBetaGate: {
-			{Version: version.MustParse("1.29"), Default: true, PreRelease: Beta},
-			{Version: version.MustParse("1.28"), Default: false, PreRelease: Beta},
 			{Version: version.MustParse("1.26"), Default: false, PreRelease: Alpha},
+			{Version: version.MustParse("1.28"), Default: false, PreRelease: Beta},
+			{Version: version.MustParse("1.29"), Default: true, PreRelease: Beta},
 		},
 	})
 	require.NoError(t, err)
@@ -1207,8 +1207,8 @@ func TestVersionedFeatureGateKnownFeatures(t *testing.T) {
 			{Version: version.MustParse("1.28"), Default: false, PreRelease: Beta},
 		},
 		testDeprecatedGate: {
-			{Version: version.MustParse("1.28"), Default: true, PreRelease: Deprecated},
 			{Version: version.MustParse("1.26"), Default: false, PreRelease: Alpha},
+			{Version: version.MustParse("1.28"), Default: true, PreRelease: Deprecated},
 		},
 	})
 	require.NoError(t, err)
@@ -1264,12 +1264,12 @@ func TestVersionedFeatureGateMetrics(t *testing.T) {
 			{Version: version.MustParse("1.29"), Default: true, PreRelease: Beta},
 		},
 		testBetaGate: {
-			{Version: version.MustParse("1.28"), Default: true, PreRelease: Beta},
 			{Version: version.MustParse("1.27"), Default: false, PreRelease: Alpha},
+			{Version: version.MustParse("1.28"), Default: true, PreRelease: Beta},
 		},
 		testBetaDisabled: {
-			{Version: version.MustParse("1.28"), Default: true, PreRelease: Beta},
 			{Version: version.MustParse("1.27"), Default: false, PreRelease: Alpha},
+			{Version: version.MustParse("1.28"), Default: true, PreRelease: Beta},
 		},
 	})
 	require.NoError(t, err)
@@ -1528,9 +1528,10 @@ func TestVersionedFeatureGateOverrideDefault(t *testing.T) {
 }
 
 func TestFeatureSpecAtEmulationVersion(t *testing.T) {
-	specs := VersionedSpecs{{Version: version.MustParse("1.29"), Default: true, PreRelease: GA},
-		{Version: version.MustParse("1.28"), Default: false, PreRelease: Beta},
+	specs := VersionedSpecs{
 		{Version: version.MustParse("1.25"), Default: false, PreRelease: Alpha},
+		{Version: version.MustParse("1.28"), Default: false, PreRelease: Beta},
+		{Version: version.MustParse("1.29"), Default: true, PreRelease: GA},
 	}
 	sort.Sort(specs)
 	tests := []struct {
@@ -1660,8 +1661,8 @@ func TestExplicitlySet(t *testing.T) {
 					{Version: version.MustParse("1.29"), Default: false, PreRelease: Alpha},
 				},
 				testBetaGate: {
-					{Version: version.MustParse("1.29"), Default: false, PreRelease: Beta},
 					{Version: version.MustParse("1.28"), Default: false, PreRelease: Alpha},
+					{Version: version.MustParse("1.29"), Default: false, PreRelease: Beta},
 				},
 			})
 			require.NoError(t, err)
@@ -1699,8 +1700,8 @@ func TestResetFeatureValueToDefault(t *testing.T) {
 			{Version: version.MustParse("1.29"), Default: false, PreRelease: Alpha},
 		},
 		testBetaGate: {
-			{Version: version.MustParse("1.29"), Default: true, PreRelease: Beta},
 			{Version: version.MustParse("1.28"), Default: false, PreRelease: Alpha},
+			{Version: version.MustParse("1.29"), Default: true, PreRelease: Beta},
 		},
 	})
 	require.NoError(t, err)
@@ -1742,3 +1743,165 @@ func TestResetFeatureValueToDefault(t *testing.T) {
 	assert.False(t, f.Enabled("TestAlpha"))
 	assert.False(t, f.Enabled("TestBeta"))
 }
+
+func TestAddVersioned(t *testing.T) {
+	// gates for testing
+	const testAGate Feature = "TestA"
+	const testBGate Feature = "TestB"
+	tests := []struct {
+		name        string
+		expectError bool
+		features    map[Feature]VersionedSpecs
+	}{
+		{
+			name: "normal progression",
+			features: map[Feature]VersionedSpecs{
+				testAGate: {
+					{Version: version.MustParse("1.29"), Default: false, PreRelease: Alpha},
+					{Version: version.MustParse("1.30"), Default: false, PreRelease: Beta},
+					{Version: version.MustParse("1.31"), Default: true, PreRelease: Beta},
+					{Version: version.MustParse("1.32"), Default: true, PreRelease: GA},
+					{Version: version.MustParse("1.33"), Default: false, PreRelease: Deprecated},
+				},
+				testBGate: {
+					{Version: version.MustParse("1.27"), Default: false, PreRelease: Alpha},
+				},
+			},
+		},
+		{
+			name:        "conflicting specs",
+			expectError: true,
+			features: map[Feature]VersionedSpecs{
+				testBGate: {
+					{Version: version.MustParse("1.28"), Default: false, PreRelease: Alpha},
+				},
+			},
+		},
+		{
+			name:        "deprecated feature with no prior state",
+			expectError: true,
+			features: map[Feature]VersionedSpecs{
+				testAGate: {
+					{Version: version.MustParse("1.29"), Default: false, PreRelease: Deprecated},
+				},
+			},
+		},
+		{
+			name: "deprecated feature with prior state",
+			features: map[Feature]VersionedSpecs{
+				testAGate: {
+					{Version: version.MustParse("1.0"), Default: true, PreRelease: GA},
+					{Version: version.MustParse("1.29"), Default: false, PreRelease: Deprecated},
+				},
+			},
+		},
+		{
+			name:        "duplicate version",
+			expectError: true,
+			features: map[Feature]VersionedSpecs{
+				testAGate: {
+					{Version: version.MustParse("1.29"), Default: false, PreRelease: Alpha},
+					{Version: version.MustParse("1.29"), Default: true, PreRelease: Beta},
+				},
+			},
+		},
+		{
+			name:        "decreasing version",
+			expectError: true,
+			features: map[Feature]VersionedSpecs{
+				testAGate: {
+					{Version: version.MustParse("1.30"), Default: false, PreRelease: Beta},
+					{Version: version.MustParse("1.29"), Default: true, PreRelease: Beta},
+				},
+			},
+		},
+		{
+			name:        "Beta to Alpha",
+			expectError: true,
+			features: map[Feature]VersionedSpecs{
+				testAGate: {
+					{Version: version.MustParse("1.29"), Default: true, PreRelease: Beta},
+					{Version: version.MustParse("1.30"), Default: false, PreRelease: Alpha},
+				},
+			},
+		},
+		{
+			name:        "GA to Alpha",
+			expectError: true,
+			features: map[Feature]VersionedSpecs{
+				testAGate: {
+					{Version: version.MustParse("1.29"), Default: true, PreRelease: GA},
+					{Version: version.MustParse("1.30"), Default: false, PreRelease: Alpha},
+				},
+			},
+		},
+		{
+			name:        "GA to Beta",
+			expectError: true,
+			features: map[Feature]VersionedSpecs{
+				testAGate: {
+					{Version: version.MustParse("1.29"), Default: true, PreRelease: GA},
+					{Version: version.MustParse("1.30"), Default: true, PreRelease: Beta},
+				},
+			},
+		},
+		{
+			name:        "Alpha to Deprecated to Beta",
+			expectError: true,
+			features: map[Feature]VersionedSpecs{
+				testAGate: {
+					{Version: version.MustParse("1.29"), Default: false, PreRelease: Alpha},
+					{Version: version.MustParse("1.30"), Default: false, PreRelease: Deprecated},
+					{Version: version.MustParse("1.31"), Default: true, PreRelease: Beta},
+				},
+			},
+		},
+		{
+			name: "Deprecated to Deprecated",
+			features: map[Feature]VersionedSpecs{
+				testAGate: {
+					{Version: version.MustParse("1.29"), Default: false, PreRelease: Alpha},
+					{Version: version.MustParse("1.30"), Default: true, PreRelease: Deprecated},
+					{Version: version.MustParse("1.31"), Default: false, PreRelease: Deprecated},
+				},
+			},
+		},
+		{
+			name: "always Deprecated",
+			features: map[Feature]VersionedSpecs{
+				testAGate: {
+					{Version: version.MustParse("1.0"), Default: false, PreRelease: Deprecated},
+				},
+			},
+		},
+		{
+			name:        "patch version",
+			expectError: true,
+			features: map[Feature]VersionedSpecs{
+				testAGate: {
+					{Version: version.MustParse("1.29.1"), Default: false, PreRelease: Alpha},
+					{Version: version.MustParse("1.30"), Default: false, PreRelease: Beta},
+				},
+			},
+		},
+	}
+	for _, test := range tests {
+		t.Run(fmt.Sprintf("AddVersioned-%s", test.name), func(t *testing.T) {
+			f := NewFeatureGate()
+			err := f.AddVersioned(map[Feature]VersionedSpecs{
+				testBGate: {
+					{Version: version.MustParse("1.27"), Default: false, PreRelease: Alpha},
+				},
+			})
+			require.NoError(t, err)
+			err = f.AddVersioned(test.features)
+			if err != nil && !test.expectError {
+				t.Errorf("expected no errors, error found %+v", err)
+			}
+
+			if err == nil && test.expectError {
+				t.Errorf("expected errors, no errors found")
+			}
+		})
+	}
+}

staging/src/k8s.io/component-base/featuregate/registry_test.go

@@ -22,6 +22,7 @@ import (
 	"testing"
 
 	"github.com/spf13/pflag"
+
 	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
 	"k8s.io/apimachinery/pkg/util/version"
 	baseversion "k8s.io/component-base/version"
@@ -60,16 +61,16 @@ func testRegistry(t *testing.T) *componentGlobalsRegistry {
 	fgKube := NewVersionedFeatureGate(version.MustParse("0.0"))
 	err := fgKube.AddVersioned(map[Feature]VersionedSpecs{
 		"kubeA": {
-			{Version: version.MustParse("1.31"), Default: true, LockToDefault: true, PreRelease: GA},
-			{Version: version.MustParse("1.28"), Default: false, PreRelease: Beta},
 			{Version: version.MustParse("1.27"), Default: false, PreRelease: Alpha},
+			{Version: version.MustParse("1.28"), Default: false, PreRelease: Beta},
+			{Version: version.MustParse("1.31"), Default: true, LockToDefault: true, PreRelease: GA},
 		},
 		"kubeB": {
 			{Version: version.MustParse("1.30"), Default: false, PreRelease: Alpha},
 		},
 		"commonC": {
-			{Version: version.MustParse("1.29"), Default: true, PreRelease: Beta},
 			{Version: version.MustParse("1.27"), Default: false, PreRelease: Alpha},
+			{Version: version.MustParse("1.29"), Default: true, PreRelease: Beta},
 		},
 	})
 	if err != nil {
@@ -80,16 +81,16 @@ func testRegistry(t *testing.T) *componentGlobalsRegistry {
 	fgTest := NewVersionedFeatureGate(version.MustParse("0.0"))
 	err = fgTest.AddVersioned(map[Feature]VersionedSpecs{
 		"testA": {
-			{Version: version.MustParse("2.10"), Default: true, PreRelease: GA},
-			{Version: version.MustParse("2.8"), Default: false, PreRelease: Beta},
 			{Version: version.MustParse("2.7"), Default: false, PreRelease: Alpha},
+			{Version: version.MustParse("2.8"), Default: false, PreRelease: Beta},
+			{Version: version.MustParse("2.10"), Default: true, PreRelease: GA},
 		},
 		"testB": {
 			{Version: version.MustParse("2.9"), Default: false, PreRelease: Alpha},
 		},
 		"commonC": {
-			{Version: version.MustParse("2.9"), Default: true, PreRelease: Beta},
 			{Version: version.MustParse("2.7"), Default: false, PreRelease: Alpha},
+			{Version: version.MustParse("2.9"), Default: true, PreRelease: Beta},
 		},
 	})
 	if err != nil {

staging/src/k8s.io/component-base/featuregate/testing/feature_gate_test.go

@@ -21,6 +21,7 @@ import (
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
+
 	"k8s.io/apimachinery/pkg/util/version"
 	"k8s.io/component-base/featuregate"
 )
@@ -173,15 +174,15 @@ func TestSpecialGatesVersioned(t *gotest.T) {
 			{Version: version.MustParse("1.31"), Default: true, PreRelease: featuregate.Beta},
 		},
 		"beta_default_on_set_off": {
-			{Version: version.MustParse("1.31"), Default: true, PreRelease: featuregate.Beta},
 			{Version: version.MustParse("1.27"), Default: false, PreRelease: featuregate.Alpha},
+			{Version: version.MustParse("1.31"), Default: true, PreRelease: featuregate.Beta},
 		},
 		"beta_default_off": {
 			{Version: version.MustParse("1.27"), Default: false, PreRelease: featuregate.Beta},
 		},
 		"beta_default_off_set_on": {
-			{Version: version.MustParse("1.31"), Default: false, PreRelease: featuregate.Beta},
 			{Version: version.MustParse("1.27"), Default: false, PreRelease: featuregate.Alpha},
+			{Version: version.MustParse("1.31"), Default: false, PreRelease: featuregate.Beta},
 		},
 	})
 	require.NoError(t, err)

staging/src/k8s.io/sample-apiserver/pkg/cmd/server/start.go

@@ -143,9 +143,9 @@ func NewCommandStartWardleServer(ctx context.Context, defaults *WardleServerOpti
 	// These specifications, together with the effective version, determine if the feature is enabled.
 	utilruntime.Must(wardleFeatureGate.AddVersioned(map[featuregate.Feature]featuregate.VersionedSpecs{
 		"BanFlunder": {
-			{Version: version.MustParse("1.2"), Default: true, PreRelease: featuregate.GA, LockToDefault: true},
-			{Version: version.MustParse("1.1"), Default: true, PreRelease: featuregate.Beta},
 			{Version: version.MustParse("1.0"), Default: false, PreRelease: featuregate.Alpha},
+			{Version: version.MustParse("1.1"), Default: true, PreRelease: featuregate.Beta},
+			{Version: version.MustParse("1.2"), Default: true, PreRelease: featuregate.GA, LockToDefault: true},
 		},
 	}))
 

test/featuregates_linter/test_data/versioned_feature_list.yaml

@@ -28,18 +28,30 @@
     version: "1.30"
 - name: AllowDNSOnlyNodeCSR
   versionedSpecs:
+  - default: true
+    lockToDefault: false
+    preRelease: GA
+    version: "1.0"
   - default: false
     lockToDefault: false
     preRelease: Deprecated
     version: "1.31"
 - name: AllowInsecureKubeletCertificateSigningRequests
   versionedSpecs:
+  - default: true
+    lockToDefault: false
+    preRelease: GA
+    version: "1.0"
   - default: false
     lockToDefault: false
     preRelease: Deprecated
     version: "1.31"
 - name: AllowOverwriteTerminationGracePeriodSeconds
   versionedSpecs:
+  - default: true
+    lockToDefault: false
+    preRelease: GA
+    version: "1.0"
   - default: false
     lockToDefault: false
     preRelease: Deprecated
@@ -52,6 +64,10 @@
     version: "1.33"
 - name: AllowServiceLBStatusOnNonLB
   versionedSpecs:
+  - default: true
+    lockToDefault: false
+    preRelease: GA
+    version: "1.0"
   - default: false
     lockToDefault: false
     preRelease: Deprecated
@@ -620,6 +636,10 @@
     version: "1.31"
 - name: KMSv1
   versionedSpecs:
+  - default: true
+    lockToDefault: false
+    preRelease: GA
+    version: "1.0"
   - default: true
     lockToDefault: false
     preRelease: Deprecated
@@ -670,6 +690,10 @@
     version: "1.27"
 - name: KubeletRegistrationGetOnExistsOnly
   versionedSpecs:
+  - default: true
+    lockToDefault: false
+    preRelease: GA
+    version: "1.0"
   - default: false
     lockToDefault: false
     preRelease: Deprecated