Ensuring EndpointSlice controller does not start when feature gate or

API are disabled

cmd/kube-controller-manager/app/BUILD

@@ -109,6 +109,7 @@ go_library(
         "//pkg/volume/util:go_default_library",
         "//pkg/volume/vsphere_volume:go_default_library",
         "//staging/src/k8s.io/api/core/v1:go_default_library",
+        "//staging/src/k8s.io/api/discovery/v1beta1:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/runtime/schema:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/util/runtime:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/util/sets:go_default_library",

cmd/kube-controller-manager/app/discovery.go

@@ -23,10 +23,24 @@ package app
 import (
 	"net/http"
 
+	discoveryv1beta1 "k8s.io/api/discovery/v1beta1"
+	utilfeature "k8s.io/apiserver/pkg/util/feature"
+	"k8s.io/klog"
 	endpointslicecontroller "k8s.io/kubernetes/pkg/controller/endpointslice"
+	"k8s.io/kubernetes/pkg/features"
 )
 
 func startEndpointSliceController(ctx ControllerContext) (http.Handler, bool, error) {
+	if !utilfeature.DefaultFeatureGate.Enabled(features.EndpointSlice) {
+		klog.V(4).Infof("Not starting endpointslice-controller since EndpointSlice feature gate is disabled")
+		return nil, false, nil
+	}
+
+	if !ctx.AvailableResources[discoveryv1beta1.SchemeGroupVersion.WithResource("endpointslices")] {
+		klog.Warningf("Not starting endpointslice-controller since discovery.k8s.io/v1beta1 resources are not available")
+		return nil, false, nil
+	}
+
 	go endpointslicecontroller.NewController(
 		ctx.InformerFactory.Core().V1().Pods(),
 		ctx.InformerFactory.Core().V1().Services(),