Hi, I feel like we ought to trim the support for a few old versions from pg_upgrade. In my particular case I don't really think it's reasonable to test < 9.0 versions for pg_largeobject_metadata migrations. But I think we should create a policy that's the default, leaving individual cases aside.
I can see a few possible policies: 1) Support upgrading from the set of releases that were supported when the pg_upgrade target version was released. While some will argue that this is fairly short, people above it can still upgrade ~10 years worth of versions with a single intermediary upgrade. 2) Same, but +2 releases or such. 3) Support until it gets too uncomfortable. 4) Support all versions remotely feasible (i.e. don't drop versions that still can be compiled) I personally think 1 is preferrable and 2 is acceptable. Greetings, Andres Freund
