Revert "Remove GA feature gate ComponentSLIs"

This reverts commit f1af846.

Author: Jefftree

staging/src/k8s.io/component-base/metrics/features/kube_features.go

@@ -20,8 +20,17 @@ import (
 	"k8s.io/component-base/featuregate"
 )
 
+const (
+	// owner: @logicalhan
+	// kep: https://kep.k8s.io/3466
+	// alpha: v1.26
+	ComponentSLIs featuregate.Feature = "ComponentSLIs"
+)
+
 func featureGates() map[featuregate.Feature]featuregate.FeatureSpec {
-	return map[featuregate.Feature]featuregate.FeatureSpec{}
+	return map[featuregate.Feature]featuregate.FeatureSpec{
+		ComponentSLIs: {Default: true, PreRelease: featuregate.Beta},
+	}
 }
 
 // AddFeatureGates adds all feature gates used by this package.

test/featuregates_linter/test_data/unversioned_feature_list.yaml

@@ -1,3 +1,9 @@
+- name: ComponentSLIs
+  versionedSpecs:
+  - default: true
+    lockToDefault: false
+    preRelease: Beta
+    version: ""
 - name: ContextualLogging
   versionedSpecs:
   - default: true