// DeletedClusters contains list of all subset clusters for the deleted DR or updated DR.
	// When clusters are rebuilt, we rebuild the subset clusters as well. So, we know what
	// subset clusters are really needed. So if deleted cluster is not rebuilt, then it is really deleted.
	builtClusters := sets.New[string]()
	for _, c := range clusters {
		builtClusters.Insert(c.Name)
	}