🌱 Remove deprecated ClusterResourceSet feature gate

.golangci.yml

@@ -261,10 +261,6 @@ linters:
       - linters:
           - staticcheck
         text: 'SA1019: (clusterv1alpha3.*|clusterv1alpha4.*) is deprecated: This type will be removed in one of the next releases.'
-        # Specific exclude rules for deprecated feature flags
-      - linters:
-          - staticcheck
-        text: 'SA1019: feature.ClusterResourceSet is deprecated: ClusterResourceSet feature is now GA and the corresponding feature flag will be removed in 1.12 release.'
         # v1Beta1 deprecated fields
       - linters:
           - staticcheck

config/manager/manager.yaml

@@ -23,7 +23,7 @@ spec:
             - "--leader-elect"
             - "--diagnostics-address=${CAPI_DIAGNOSTICS_ADDRESS:=:8443}"
             - "--insecure-diagnostics=${CAPI_INSECURE_DIAGNOSTICS:=false}"
-            - "--feature-gates=MachinePool=${EXP_MACHINE_POOL:=true},ClusterResourceSet=${EXP_CLUSTER_RESOURCE_SET:=true},ClusterTopology=${CLUSTER_TOPOLOGY:=false},RuntimeSDK=${EXP_RUNTIME_SDK:=false},MachineSetPreflightChecks=${EXP_MACHINE_SET_PREFLIGHT_CHECKS:=true},MachineWaitForVolumeDetachConsiderVolumeAttachments=${EXP_MACHINE_WAITFORVOLUMEDETACH_CONSIDER_VOLUMEATTACHMENTS:=true},PriorityQueue=${EXP_PRIORITY_QUEUE:=false},InPlaceUpdates=${EXP_IN_PLACE_UPDATES:=false}"
+            - "--feature-gates=MachinePool=${EXP_MACHINE_POOL:=true},ClusterTopology=${CLUSTER_TOPOLOGY:=false},RuntimeSDK=${EXP_RUNTIME_SDK:=false},MachineSetPreflightChecks=${EXP_MACHINE_SET_PREFLIGHT_CHECKS:=true},MachineWaitForVolumeDetachConsiderVolumeAttachments=${EXP_MACHINE_WAITFORVOLUMEDETACH_CONSIDER_VOLUMEATTACHMENTS:=true},PriorityQueue=${EXP_PRIORITY_QUEUE:=false},InPlaceUpdates=${EXP_IN_PLACE_UPDATES:=false}"
           image: controller:latest
           name: manager
           env:

docs/book/src/tasks/cluster-resource-set.md

@@ -3,12 +3,6 @@
 The `ClusterResourceSet` feature is introduced to provide a way to automatically apply a set of resources (such as CNI/CSI) defined by users to matching newly-created/existing clusters.
 `ClusterResourceSet` provides a basic solution for installing & managing resources, while for advanced use cases an addon provider must be used.
 
-**Feature gate name**: `ClusterResourceSet`
-
-**Variable name to enable/disable the feature gate**: `EXP_CLUSTER_RESOURCE_SET`
-
-The `ClusterResourceSet` feature is now GA and is enabled by default, but can be disabled by setting the `EXP_CLUSTER_RESOURCE_SET` environment variable to `false`.
-
 More details on `ClusterResourceSet` can be found at:
 [ClusterResourceSet CAEP](https://github.com/kubernetes-sigs/cluster-api/blob/main/docs/proposals/20200220-cluster-resource-set.md)
 

feature/feature.go

@@ -35,15 +35,6 @@ const (
 	// beta: v1.7
 	MachinePool featuregate.Feature = "MachinePool"
 
-	// ClusterResourceSet is a feature gate for the ClusterResourceSet functionality.
-	//
-	// alpha: v0.3
-	// beta: v0.4
-	// GA: v1.10
-	//
-	// Deprecated: ClusterResourceSet feature is now GA and the corresponding feature flag will be removed in 1.12 release.
-	ClusterResourceSet featuregate.Feature = "ClusterResourceSet"
-
 	// ClusterTopology is a feature gate for the ClusterClass and managed topologies functionality.
 	//
 	// alpha: v0.4
@@ -91,7 +82,6 @@ func init() {
 // To add a new feature, define a key for it above and add it here.
 var defaultClusterAPIFeatureGates = map[featuregate.Feature]featuregate.FeatureSpec{
 	// Every feature should be initiated here:
-	ClusterResourceSet:        {Default: true, PreRelease: featuregate.GA},
 	MachinePool:               {Default: true, PreRelease: featuregate.Beta},
 	MachineSetPreflightChecks: {Default: true, PreRelease: featuregate.Beta},
 	MachineWaitForVolumeDetachConsiderVolumeAttachments: {Default: true, PreRelease: featuregate.Beta},

internal/webhooks/clusterresourceset.go

@@ -30,7 +30,6 @@ import (
 	"sigs.k8s.io/controller-runtime/pkg/webhook/admission"
 
 	addonsv1 "sigs.k8s.io/cluster-api/api/addons/v1beta2"
-	"sigs.k8s.io/cluster-api/feature"
 )
 
 // ClusterResourceSet implements a validation and defaulting webhook for ClusterResourceSet.
@@ -93,15 +92,6 @@ func (webhook *ClusterResourceSet) ValidateDelete(_ context.Context, _ runtime.O
 func (webhook *ClusterResourceSet) validate(oldCRS, newCRS *addonsv1.ClusterResourceSet) error {
 	var allErrs field.ErrorList
 
-	// NOTE: ClusterResourceSet is behind ClusterResourceSet feature gate flag; the web hook
-	// must prevent creating new objects when the feature flag is disabled.
-	if !feature.Gates.Enabled(feature.ClusterResourceSet) {
-		return field.Forbidden(
-			field.NewPath("spec"),
-			"can be set only if the ClusterResourceSet feature flag is enabled",
-		)
-	}
-
 	// Validate selector parses as Selector
 	selector, err := metav1.LabelSelectorAsSelector(&newCRS.Spec.ClusterSelector)
 	if err != nil {

internal/webhooks/clusterresourcesetbinding.go

@@ -28,7 +28,6 @@ import (
 	"sigs.k8s.io/controller-runtime/pkg/webhook/admission"
 
 	addonsv1 "sigs.k8s.io/cluster-api/api/addons/v1beta2"
-	"sigs.k8s.io/cluster-api/feature"
 )
 
 func (webhook *ClusterResourceSetBinding) SetupWebhookWithManager(mgr ctrl.Manager) error {
@@ -75,15 +74,6 @@ func (webhook *ClusterResourceSetBinding) ValidateDelete(_ context.Context, _ ru
 func (webhook *ClusterResourceSetBinding) validate(oldCRSB, newCRSB *addonsv1.ClusterResourceSetBinding) error {
 	var allErrs field.ErrorList
 
-	// NOTE: ClusterResourceSet is behind ClusterResourceSet feature gate flag; the web hook
-	// must prevent creating new objects in case the feature flag is disabled.
-	if !feature.Gates.Enabled(feature.ClusterResourceSet) {
-		return field.Forbidden(
-			field.NewPath("spec"),
-			"can be set only if the ClusterResourceSet feature flag is enabled",
-		)
-	}
-
 	if oldCRSB != nil && oldCRSB.Spec.ClusterName != "" && oldCRSB.Spec.ClusterName != newCRSB.Spec.ClusterName {
 		allErrs = append(allErrs,
 			field.Invalid(field.NewPath("spec", "clusterName"), newCRSB.Spec.ClusterName, "field is immutable"))

main.go

@@ -731,22 +731,20 @@ func setupReconcilers(ctx context.Context, mgr ctrl.Manager, watchNamespaces map
 		}
 	}
 
-	if feature.Gates.Enabled(feature.ClusterResourceSet) {
-		if err := (&controllers.ClusterResourceSetReconciler{
-			Client:           mgr.GetClient(),
-			ClusterCache:     clusterCache,
-			WatchFilterValue: watchFilterValue,
-		}).SetupWithManager(ctx, mgr, concurrency(clusterResourceSetConcurrency), partialSecretCache); err != nil {
-			setupLog.Error(err, "Unable to create controller", "controller", "ClusterResourceSet")
-			os.Exit(1)
-		}
-		if err := (&controllers.ClusterResourceSetBindingReconciler{
-			Client:           mgr.GetClient(),
-			WatchFilterValue: watchFilterValue,
-		}).SetupWithManager(ctx, mgr, concurrency(clusterResourceSetConcurrency)); err != nil {
-			setupLog.Error(err, "Unable to create controller", "controller", "ClusterResourceSetBinding")
-			os.Exit(1)
-		}
+	if err := (&controllers.ClusterResourceSetReconciler{
+		Client:           mgr.GetClient(),
+		ClusterCache:     clusterCache,
+		WatchFilterValue: watchFilterValue,
+	}).SetupWithManager(ctx, mgr, concurrency(clusterResourceSetConcurrency), partialSecretCache); err != nil {
+		setupLog.Error(err, "Unable to create controller", "controller", "ClusterResourceSet")
+		os.Exit(1)
+	}
+	if err := (&controllers.ClusterResourceSetBindingReconciler{
+		Client:           mgr.GetClient(),
+		WatchFilterValue: watchFilterValue,
+	}).SetupWithManager(ctx, mgr, concurrency(clusterResourceSetConcurrency)); err != nil {
+		setupLog.Error(err, "Unable to create controller", "controller", "ClusterResourceSetBinding")
+		os.Exit(1)
 	}
 
 	if err := (&controllers.MachineHealthCheckReconciler{