I am honestly kinda curious how exactly you manage your servers and keep them up to date, I feel like there is a linux patch every week or so, which would usually require a reboot. Do you all deploy live patching, how you become aware of critical stuff in your otherwise busy lives, RSS?
Not much of an addition, but you’re absolutely right, in most systems that are expected to be highly available, there’s standard maintenance times, an agreement in place, and no critical use of the system is permitted to be scheduled in that regular time period. Any deployments are limited to that window, in case a rollback is necessary, data sync, etc.
All of that is in addition to the type of high availability stuff you’re describing.