// the workload entry.
	if proxy.Metadata.Labels != nil {
		entry.Labels = mergeLabels(entry.Labels, proxy.Metadata.Labels)
		// the label has been converted to "istio-locality: region/zone/subzone"
		// in pilot/pkg/xds/ads.go, and `/` is not allowed in k8s label value.
		// Instead of converting again, we delete it since has set WorkloadEntry.Locality
		delete(entry.Labels, model.LocalityLabel)
	}

		return "DNSRoundRobin"
	case Passthrough:
		return "Passthrough"
	default:
		return fmt.Sprintf("%d", int(resolution))
	}
}

const (
	// LocalityLabel indicates the region/zone/subzone of an instance. It is used to override the native
	// registry's value.
	//
	// Note: because k8s labels does not support `/`, so we use `.` instead in k8s.
	LocalityLabel = pm.LocalityLabel
)

const (

func (ip Addr) Prev() Addr {
	if ip.Is4() {
		if uint32(ip.addr.lo) == 0 {
			return Addr{}
		}
	} else if ip.addr.isZero() {
		return Addr{}
	}
	ip.addr = ip.addr.subOne()
	return ip
}

// String returns the string form of the IP address ip.
// It returns one of 5 forms:
//
//   - "invalid IP", if ip is the zero [Addr]
//   - IPv4 dotted decimal ("192.0.2.1")