On Tue, Feb 27, 2018 at 12:16 PM, Adam Williamson <adamwill@fedoraproject.org> wrote:

Once again, folks, *please* announce your soname bumps, and co-ordinate
rebuilds. (In fact it looks like Zdenek is the maintainer of both
packages and could have rebuilt cups-filters, but just forgot to).

Is it time to update the packaging guidelines to enforce setting a "%global sover <X>" and using it in %files? 

If nothing else it should at least be documented as a best practice.