fix: update output of convert-k8s command

This includes Sean's comments from #3278 and introduces a new flag which
is referenced in manual conversion process document.

Signed-off-by: Andrey Smirnov <smirnov.andrey@gmail.com>
(cherry picked from commit 6f7df3d)

cmd/talosctl/cmd/talos/convert-k8s.go

@@ -33,6 +33,11 @@ var convertOptions k8s.ConvertOptions
 func init() {
 	convertK8sCmd.Flags().StringVar(&convertOptions.ControlPlaneEndpoint, "endpoint", "", "the cluster control plane endpoint")
 	convertK8sCmd.Flags().BoolVar(&convertOptions.ForceYes, "force", false, "skip prompts, assume yes")
+	convertK8sCmd.Flags().BoolVar(&convertOptions.OnlyRemoveInitializedKey, "remove-initialized-key", false, "only remove bootkube initialized key (used in manual conversion)")
+
+	// hiding this flag as it should only be used in manual process (and it's documented there), but should never be used in automatic conversion
+	convertK8sCmd.Flags().MarkHidden("remove-initialized-key") //nolint: errcheck
+
 	addCommand(convertK8sCmd)
 }
 

pkg/cluster/kubernetes/convert.go

@@ -41,8 +41,9 @@ import (
 
 // ConvertOptions are options for convert tasks.
 type ConvertOptions struct {
-	ControlPlaneEndpoint string
-	ForceYes             bool
+	ControlPlaneEndpoint     string
+	ForceYes                 bool
+	OnlyRemoveInitializedKey bool
 
 	masterNodes []string
 }
@@ -73,6 +74,11 @@ func ConvertToStaticPods(ctx context.Context, cluster ConvertProvider, options C
 		return fmt.Errorf("no master nodes discovered")
 	}
 
+	// only used in manual conversion process
+	if options.OnlyRemoveInitializedKey {
+		return removeInitializedKey(ctx, cluster, options.masterNodes[0])
+	}
+
 	fmt.Printf("discovered master nodes %q\n", options.masterNodes)
 
 	selfHosted, err := IsSelfHostedControlPlane(ctx, cluster, options.masterNodes[0])
@@ -95,7 +101,8 @@ func ConvertToStaticPods(ctx context.Context, cluster ConvertProvider, options C
 		fmt.Printf("\ttalosctl -n <master node IP> get %s\n", k8s.StaticPodType)
 		fmt.Printf("\ttalosctl -n <master node IP> get %s\n", k8s.ManifestType)
 		fmt.Println()
-		fmt.Println("bootstrap manifests will only be applied for missing resources, existing resources will not be updated")
+		fmt.Println("in order to remove self-hosted control plane, pod-checkpointer component needs to be disabled")
+		fmt.Println("once pod-checkpointer is disabled, the cluster shouldn't be rebooted until the entire conversion process is complete")
 
 		if !options.ForceYes {
 			var yes bool