defaultExportTo sets.Set[visibility.Instance],
) ([]config.Config, map[ConfigKey][]ConfigKey) {
	out := make([]config.Config, 0, len(vServices))
	delegatesMap := map[types.NamespacedName]config.Config{}
	delegatesExportToMap := make(map[types.NamespacedName]sets.Set[visibility.Instance])
	// root virtualservices with delegate
	var rootVses []config.Config

	// 1. classify virtualservices
	for _, vs := range vServices {