diff --git a/pkg/registry/rest/create.go b/pkg/registry/rest/create.go
index 32ca642cf..83d5e576a 100644
--- a/pkg/registry/rest/create.go
+++ b/pkg/registry/rest/create.go
@@ -126,6 +126,7 @@ func BeforeCreate(strategy RESTCreateStrategy, ctx context.Context, obj runtime.
 	// ZZZ_DeprecatedClusterName is ignored and should not be saved
 	if len(objectMeta.GetZZZ_DeprecatedClusterName()) > 0 {
 		objectMeta.SetZZZ_DeprecatedClusterName("")
+		warning.AddWarning(ctx, "", "metadata.clusterName was specified. This field is not preserved and will be removed from the schema in 1.25")
 	}
 
 	if errs := strategy.Validate(ctx, obj); len(errs) > 0 {
diff --git a/pkg/registry/rest/update.go b/pkg/registry/rest/update.go
index 7c8ec3e2e..e5ae7af0e 100644
--- a/pkg/registry/rest/update.go
+++ b/pkg/registry/rest/update.go
@@ -139,6 +139,7 @@ func BeforeUpdate(strategy RESTUpdateStrategy, ctx context.Context, obj, old run
 	// ZZZ_DeprecatedClusterName is ignored and should not be saved
 	if len(objectMeta.GetZZZ_DeprecatedClusterName()) > 0 {
 		objectMeta.SetZZZ_DeprecatedClusterName("")
+		warning.AddWarning(ctx, "", "metadata.clusterName was specified. This field is not preserved and will be removed from the schema in 1.25")
 	}
 	// Use the existing UID if none is provided
 	if len(objectMeta.GetUID()) == 0 {