I summarized it in another bug nicely (I think), quoting it here to be
on the main bug as well:

This had two phases with both having had their own issues:

Phase I: ~2013-2016: the libvirt-<uuid> stayed around and could be used for 
such overrides, but they cluttered the file system and overview was lost, 
therefore a cron daemon was established to clean files of currently undefined 
domains (which still could kill overrides that people wanted to stay).
Override: Was too unreliable to rely on it

Phase II: 2017-now the cleaning became part of libvirt itself due to [1]. This 
will immediately remove the file and unload profiles, keeping the config dir 
clean but even removed unreliable override capability we had.
Override: doesn't work at all

Phase III: future as planned in this bug.
It is intended to use the new "include if available" feature of apparmor to 
allow providing non-cleaned overrides to just those guests that you want/need.
That would mean on most installations there would be no extra config clutter at 
all.
On others where it is needed they can be used for overrides.

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https://bugs.launchpad.net/bugs/1745114

Title:
  Please add guest uuid and guest-generic local include files

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