code: func (pbm *PodBackoffMap) CleanupPodsCompletesBackingoff() {
  	pbm.lock.Lock()
  	defer pbm.lock.Unlock()
  	for pod, value := range pbm.podLastUpdateTime {
  		if value.Add(pbm.maxDuration).Before(time.Now()) {
  			pbm.clearPodBackoff(pod)
  		}
  	}
  }
docs: // CleanupPodsCompletesBackingoff execute garbage collection on the pod backoff,
  // i.e, it will remove a pod from the PodBackoffMap if
  // lastUpdateTime + maxBackoffDuration is before the current timestamp