minAvailable := *(deployment.Spec.Replicas) - maxUnavailable
	newRSUnavailablePodCount := *(newRS.Spec.Replicas) - newRS.Status.AvailableReplicas
	maxScaledDown := allPodsCount - minAvailable - newRSUnavailablePodCount
	if maxScaledDown <= 0 {
		return false, nil
	}

	// Clean up unhealthy replicas first, otherwise unhealthy replicas will block deployment