Fwd: Dropping Release and Release.gpg support from APT

Do we have any repositories that do not have InRelease files for eoan+?

See below for details, sorry about the forwarding, but it's a bit messy
with cross-posting to ubuntu-devel.

Also, of course 19.10, not 18.10, upstream me is silly.

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we currently have code dealing with falling back from InRelease
to Release{,.gpg} and it's all a bit much IMO. Now that buster
has been released with an InRelease file, the time has IMO come for
us to drop support for the old stuff from APT!

Timeline suggestion
My idea being that we give this a cycle in the Ubuntu 18.10 stable
release before we drop it, so people are ready for it.

Why remove it?