return c.hits == 0 && c.miss == 0
}

func (c cacheStats) merge(other cacheStats) cacheStats {
	return cacheStats{
		hits: c.hits + other.hits,
		miss: c.miss + other.miss,
	}
}

func buildClusterKey(service *model.Service, port *model.Port, cb *ClusterBuilder, proxy *model.Proxy, efKeys []string) clusterCache {
	clusterName := model.BuildSubsetKey(model.TrafficDirectionOutbound, "", service.Hostname, port.Port)

		if service.Resolution == model.Alias {
			continue
		}
		for _, port := range service.Ports {
			if port.Protocol == protocol.UDP {
				continue
			}
			clusterKey := buildClusterKey(service, port, cb, proxy, efKeys)
			cached, allFound := cb.getAllCachedSubsetClusters(clusterKey)
			if allFound && !features.EnableUnsafeAssertions {
				hit += len(cached)
				resources = append(resources, cached...)