HostnameAndNamespace map[host.Name]map[string]*Service `json:"-"`

	// instancesByPort contains a map of service key and instances by port. It is stored here
	// to avoid recomputations during push. This caches instanceByPort calls with empty labels.
	// Call InstancesByPort directly when instances need to be filtered by actual labels.
	instancesByPort map[string]map[int][]*IstioEndpoint
}