Comment 2 for bug 2044143

Thanks Robert. There is an old PR around for fixing this [0]. It's actually not that straightforward as it depends what the user is upgrading to. What database software is used depends on what the underlying Ubuntu version is involved (Bionic or Focal), which alters the steps needed to upgrade. So at a higher level, some extra guidance may be needed here. I'll look into this.

[0]: https://review.opendev.org/c/openstack/charm-guide/+/895695