Checklist after upgrading to MySQL 8?

We’re testing database upgrade from MySQL 5.7 to 8 on staging server.

I’ve followed 2 database articles (links at the bottom) for the upgrade and have checked the known issues listed.
After upgrading to MySQL 8, we’re checking the logs and going through our workflow to make sure everything is in working order.

Just wondering if there is a must-do test after database switch/upgrade that isn’t mentiond in the articles?