Upgraded to 3.3.0.
Ran into an issue with redis-server being too old; upgraded manually. sidekiq wouldn't start. Emails weren't being sent. Federation was hot happening. Fixed. Service restored. Will need to upgrade instance OS in near future.
Done. Running @3.1.2.
That did not work as planned. Another attempt later this weekend.
An update to 2.3.3 will happen this weekend. It generally takes about 15-20 minutes for this to take place.
Another post will come before the maintenance actually takes place.
For more information see: