package cleanup after offline updates

[Chris Murphy]

Hi,

Fedora 27 Workstation, using GNOME Software for offline updates, with
updates-testing enabled. I'm noticing an accumulation of long since
applied RPMs in

/var/cache/PackageKit/27/metadata/updates-testing/packages

What's responsible for package cleanup after applying updates? I'm
wondering if it's possible cleanups happen correctly for updates, and
there's a bug where cleanup isn't happening for updates-testing?

-- 
Chris Murphy