Description of problem: Starting with openSUSE Leap 15.2.1 (openSUSE Jump), openSUSE Leap will be comprised of a mixture of packages with the SUSE vendor and the openSUSE vendor. There is no way in DNF for this to be considered equivalent, and if automatic vendor changing is turned off, upgrading from Leap 15.2 to 15.2.1 or 15.3 will fail. It'd be great if we could have vendor equivalence configuration similar to to the way Zypper does it[1], with configuration in /etc/dnf/vendors.d for drop-in files that define vendor equivalents. For example, /etc/dnf/vendors.d/opensuse-leap.conf would define SUSE and openSUSE vendors as equivalent for supporting openSUSE Leap. [1]: https://doc.opensuse.org/projects/libzypp/HEAD/pg_zypp-solv-vendorchange.html#zypp-solv-vendorchange-equiv
Shifting this to dnf5 as that is where development is now.
I implemented vendor change policies. PR https://github.com/rpm-software-management/dnf5/pull/2469 The implementation provides greater flexibility and fully covers equivalent vendors for "vendor stickiness."