keys := map[instancesKey]struct{}{}
	for _, i := range instances {
		keys[makeInstanceKey(i)] = struct{}{}
	}
	s.queueEdsEvent(keys, s.doEdsCacheUpdate)
}

// queueEdsEvent processes eds events sequentially for the passed keys and invokes the passed function.
func (s *Controller) queueEdsEvent(keys sets.Set[instancesKey], edsFn func(keys sets.Set[instancesKey])) {
	// wait for the cache update finished