If your service is only provided by one machine then you have to accept it will occasionally be out of use.
If the only monitoring of the service you have are users telling you, then that’s not a problem you can avoid by not updating.
If the only monitoring of the service you have are users telling you, then that’s not a problem you can avoid by not updating.
But, I can minimize possible downtimes, by learning from other downtime reports on a bug tracker.