//  3. sync node status, for reporting unhealthy /healthz response
//     if the node is marked for deletion by autoscaler.
//  4. get proxy health by verifying that the delay between QueuedUpdate()
//     calls and Updated() calls exceeded healthTimeout or not.
type ProxierHealthServer struct {
	listener    listener
	httpFactory httpServerFactory
	clock       clock.Clock

	addr          string