type ProxyProvider interface {
	// OnServiceUpdate manages the active set of service proxies.
	// Active service proxies are reinitialized if found in the update set or
	// removed if missing from the update set.
	OnServiceUpdate(services []api.Service)
	// Sync immediately synchronizes the ProxyProvider's current state to iptables.
	Sync()
	// SyncLoop runs periodic work.
	// This is expected to run as a goroutine or as the main loop of the app.
	// It does not return.
	SyncLoop()
}

type ServicePortName struct {
	types.NamespacedName
	Port string
}