kubeadm: remove deprecated upgrade flags for 1.32

The flags for control-plane component manifest under 'upgrade diff'
and the --feture-gates flag were deprecated and NOOP in 1.31
and can be removed in 1.32.

Author: neolit123

cmd/kubeadm/app/apis/kubeadm/validation/validation.go

@@ -610,8 +610,6 @@ func isAllowedFlag(flagName string) bool {
 		kubeadmcmdoptions.KubeconfigDir,
 		kubeadmcmdoptions.UploadCerts,
 		kubeadmcmdoptions.PrintManifest,
-		kubeadmcmdoptions.FeatureGatesString,                                       // TODO: remove this line when --feature-gates flag is deprecated and dropped from "kubeadm upgrade apply/plan"
-		"api-server-manifest", "controller-manager-manifest", "scheduler-manifest", // TODO: remove this line when these flags are deprecated and dropped from "kubeadm upgrade diff"
 		"allow-missing-template-keys", "output", "show-managed-fields",
 		"print-join-command", "rootfs", "v", "log-file", "yes")
 	if allowedFlags.Has(flagName) {

cmd/kubeadm/app/cmd/upgrade/diff.go

@@ -54,12 +54,6 @@ type diffFlags struct {
 	out                           io.Writer
 }
 
-var (
-	defaultAPIServerManifestPath         = constants.GetStaticPodFilepath(constants.KubeAPIServer, constants.GetStaticPodDirectory())
-	defaultControllerManagerManifestPath = constants.GetStaticPodFilepath(constants.KubeControllerManager, constants.GetStaticPodDirectory())
-	defaultSchedulerManifestPath         = constants.GetStaticPodFilepath(constants.KubeScheduler, constants.GetStaticPodDirectory())
-)
-
 // newCmdDiff returns the cobra command for `kubeadm upgrade diff`
 func newCmdDiff(out io.Writer) *cobra.Command {
 	flags := &diffFlags{
@@ -88,14 +82,7 @@ func newCmdDiff(out io.Writer) *cobra.Command {
 
 	options.AddKubeConfigFlag(cmd.Flags(), &flags.kubeConfigPath)
 	options.AddConfigFlag(cmd.Flags(), &flags.cfgPath)
-	cmd.Flags().StringVar(&flags.apiServerManifestPath, "api-server-manifest", defaultAPIServerManifestPath, "path to API server manifest")
-	cmd.Flags().MarkDeprecated("api-server-manifest", "This flag is deprecated and will be removed in a future release.")
-	cmd.Flags().StringVar(&flags.controllerManagerManifestPath, "controller-manager-manifest", defaultControllerManagerManifestPath, "path to controller manifest")
-	cmd.Flags().MarkDeprecated("controller-manager-manifest", "This flag is deprecated and will be removed in a future release.")
-	cmd.Flags().StringVar(&flags.schedulerManifestPath, "scheduler-manifest", defaultSchedulerManifestPath, "path to scheduler manifest")
-	cmd.Flags().MarkDeprecated("scheduler-manifest", "This flag is deprecated and will be removed in a future release.")
 	cmd.Flags().IntVarP(&flags.contextLines, "context-lines", "c", 3, "How many lines of context in the diff")
-
 	return cmd
 }
 

cmd/kubeadm/app/cmd/upgrade/upgrade.go

@@ -17,13 +17,11 @@ limitations under the License.
 package upgrade
 
 import (
-	"fmt"
 	"io"
 
 	"github.com/spf13/cobra"
 	"github.com/spf13/pflag"
 
-	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/kubernetes/cmd/kubeadm/app/cmd/options"
 	cmdutil "k8s.io/kubernetes/cmd/kubeadm/app/cmd/util"
 	kubeadmconstants "k8s.io/kubernetes/cmd/kubeadm/app/constants"
@@ -73,8 +71,5 @@ func addApplyPlanFlags(fs *pflag.FlagSet, flags *applyPlanFlags) {
 	fs.BoolVar(&flags.allowExperimentalUpgrades, "allow-experimental-upgrades", flags.allowExperimentalUpgrades, "Show unstable versions of Kubernetes as an upgrade alternative and allow upgrading to an alpha/beta/release candidate versions of Kubernetes.")
 	fs.BoolVar(&flags.allowRCUpgrades, "allow-release-candidate-upgrades", flags.allowRCUpgrades, "Show release candidate versions of Kubernetes as an upgrade alternative and allow upgrading to a release candidate versions of Kubernetes.")
 	fs.BoolVar(&flags.printConfig, "print-config", flags.printConfig, "Specifies whether the configuration file that will be used in the upgrade should be printed or not.")
-	options.AddFeatureGatesStringFlag(fs, &flags.featureGatesString) // TODO: remove in 1.32
-	_ = fs.MarkDeprecated(options.FeatureGatesString, fmt.Sprintf("This flag is deprecated and no-op now. It will be removed in a future release. The upgrade workflow is not designed to reconfigure the cluster. "+
-		"Please edit the 'featureGates' field of ClusterConfiguration which is defined in the %s/%s ConfigMap instead.", metav1.NamespaceSystem, kubeadmconstants.KubeadmConfigConfigMap))
 	options.AddIgnorePreflightErrorsFlag(fs, &flags.ignorePreflightErrors)
 }