Following my post on discuss.ocaml.org, I have created a new release of ocurrent/ocaml-version that moves the minimum version of OCaml, considered as recent, from 4.02 to 4.08.
let recent = [ v4_08; v4_09; v4_10; v4_11; v4_12; v4_13; v4_14; v5_0; v5_1; v5_2; v5_3 ]
This may feel like a mundane change, but OCaml-CI, opam-repo-ci, Docker base image builder among other things, use this to determine the set of versions of OCaml to test against. Therefore, as these services are updated, testing on the old releases will be removed.