I've just realized the python3.8 monitor page lists 2 interesting packages: python2-pluggy and python2-pytest. Those are however dead links (when clicking package name, it leads to error 404) and the builds are from Pull Requests (pluggy, pytest).

I don't consider builds from PR to be visible at the monitor page as a useful feature, it basically makes the information unreliable and I cannot longer trust it. Anyone can open a PR to any package I have, adding new packages into the monitor page.