My hosting provider, Linode, will be performing scheduled maintenance next Wednesday, October 23rd:
Recently, we identified a commit to the upstream Linux kernel as the cause of an increase in emergency maintenance on our platform. After implementing and gaining confidence in a fix, we are now ready to roll this update out to the remainder of our fleet. We’re confident this will resolve the bug and ultimately lessen the amount of unplanned maintenance for your Linodes as a result of this specific issue.
The server will unavailable from 2019-10-23 2:00:00 AM UTC, for up to two hours. Typically it’s much shorter than that, usually lasting around half an hour.