func (w *watchCache) isIndexValidLocked(index int) bool {
	return index >= w.startIndex
}

// getAllEventsSinceLocked returns a watchCacheInterval that can be used to
// retrieve events since a certain resourceVersion. This function assumes to
// be called under the watchCache lock.
func (w *watchCache) getAllEventsSinceLocked(resourceVersion uint64, key string, opts storage.ListOptions) (*watchCacheInterval, error) {