}
		fo := []krt.FetchOption{krt.FilterIndex(WorkloadServicesNamespaceIndex, wle.Namespace), krt.FilterSelectsNonEmpty(wle.GetLabels())}
		if !features.EnableK8SServiceSelectWorkloadEntries {
			fo = append(fo, krt.FilterGeneric(func(a any) bool {
				return a.(model.ServiceInfo).Source == kind.ServiceEntry
			}))
		}
		services := krt.Fetch(ctx, WorkloadServices, fo...)

		h.filter.selectsNonEmpty = lbls
	}
}

func FilterLabel(lbls map[string]string) FetchOption {
	return func(h *dependency) {
		h.filter.labels = lbls
	}
}

func FilterGeneric(f func(any) bool) FetchOption {
	return func(h *dependency) {
		h.filter.generic = f
	}
}

func (f *filter) Matches(object any, forList bool) bool {

		if _, f := pd.Labels["want-size"]; !f {
			return nil
		}
		matches := krt.Fetch(ctx, SizedPods, krt.FilterGeneric(func(a any) bool {
			return a.(SizedPod).Size == pd.Labels["want-size"]
		}))
		return &PodSizeCount{
			Named:         pd.Named,
			MatchingSizes: len(matches),
		}
	})

* `FilterSelectsNonEmpty(labels)`: filters to only objects that **select** these labels. An empty selector matches nothing.
* `FilterGeneric(func(any) bool)`: filters by an arbitrary function.

Note that most filters may only be used if the objects being `Fetch`ed implement appropriate functions to extract the fields filtered against.