Unpopular opinion, but I think many systems would benefit from a regular "downtime window". Not everything needs to be 24/7 high availability.
Maybe not every night, but if you get users accustomed to the idea that you're offline for 12 hours every Sunday morning, they will not be angry when you need to be offline for 12 hours on a Sunday morning to do maintenance.
The stock market closes, more things should close. We are paying too high of a price for 99.999% uptime when 99.9% is plenty for most applications.
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