We started testing with Percona MySQL 5.7 in our dev and test environment that has ubuntu 18. Suddenly yesterday (Monday) afternoon, MySQL 5.7 was stopped on those boxes. It is probably some unattended upgrades. It never happened with Percona MySQL 5.6. Has anything changed between Percona MySQL 5.6 and MySQL 5.7 with respect to how unattended upgrades deals with MySQL?
Percona MySQL does not auto-upgrade. It never has, never will. The only way it could have upgraded would be due to a change in the way Ubuntu manages packages and auto-upgrade of packages.
As a safety measure, I suggest holding the mysql package: PinningHowto - Community Help Wiki
If you check error.log, do you see a graceful shutdown? a crash? or no shutdown message and just a fresh start?
If shutdown was graceful, something is triggering the shutdown, else, it is some bug/crash/problem
ok thanks for your responses. Turned out some issue in our test env that was trying to install 5.6 again. Sorry about that,