return idx.Lookup(k)
		}
		h.filter.indexMatches = func(a any) bool {
			return idx.objectHasKey(a.(I), k)
		}
	}
}

// FilterSelectsNonEmpty only includes objects that select this label. If the selector is empty, it is not a match.
func FilterSelectsNonEmpty(lbls map[string]string) FetchOption {
	return func(h *dependency) {
		h.filter.selectsNonEmpty = lbls
	}
}

		var waypointAddress *workloadapi.GatewayAddress
		if waypoint != nil {
			waypointAddress = a.getWaypointAddress(waypoint)
		}
		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
			}))
		}

		if p.Status.PodIP == "" {
			return nil
		}
		services := krt.Fetch(ctx, Services, krt.FilterIndex(ServicesByNamespace, p.Namespace), krt.FilterSelectsNonEmpty(p.GetLabels()))
		return &Workload{
			Named:        krt.NewNamed(p),
			IP:           p.Status.PodIP,
			ServiceNames: slices.Map(services, func(e *v1.Service) string { return e.Name }),
		}
	})

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