Hi @dgs
The bug Dewar linked relates only to the blank packages screen.
The removal of ‘republish repository metadata’ in the UI was intentional. The operation is pretty dangerous, especially if the repository uses Complete Mirroring, so it was decided to make the functionality less prominent.
If the repo is in a content view, you can still access this functionality via Hammer with
hammer content-view version republish-repositories
(add --help to the end to see all options)
Otherwise, for a single repository you can make a call to the API at /repositories/:id/republish with force: true. This is not yet added to Hammer; I’ve filed this issue to add it: Bug #34762: Add 'republish repository metadata' to Hammer - Katello - Foreman