for port, cluster := range servicePortClusters[service.Hostname.String()] {
			// if this service port is removed, we can conclude that it is a removed cluster.
			if _, exists := service.Ports.GetByPort(port); !exists {
				deletedClusters = append(deletedClusters, cluster)
			}
		}
	}
	return services, deletedClusters
}