I just tested the dnf upgrade procedure on one of our standby backup systems which happens
to have the F34 postgresql module version 9.6 installed.
The module was overwritten with version 13 without warning. Given the data
incompatibility, this is a very unattractive practice. As far as I remember, one could
rely on the fact that with an upgrade the respective module was updated in the installed
version.
Fedora 35 comes obviously without Postgres module 9.6. Unfortunately, the release change
set doesn’t mention that. We need a clear indication and warning of this.
Peter