Comment 3 for bug 2011605

I beginning to wonder if you *can* series upgrade mysql8 automatically. If the minor version (e.g. 8.0.x) changes when the first unit is series upgraded, then it won't rejoin the cluster, and so it may have to wait until all the units have updated before the cluster could be reformed. And I don't think the mysql charm code can handle reforming the cluster from 3 separated units after upgrade; although obviously it can form the cluster in the first place.

I think that series upgrading mysql8 should be removed from automatic testing for the moment until we can get a handle on how it can be handled. I'm setting the bug to triaged, but I don't think anything can be done to 'fix' it until we've investigated it much further.