Ahh, sorry I was pulling the wrong thread. It was an issue I encountered during upgrade of Katello to 3.18, when most of the repos stopped working and a lot of tmp files are piling up inside of the /var/lib/pulp directory.
This is the correct thread: https://community.theforeman.org/t/updating-foreman-2-2-1-to-2-3-1-and-katello-3-17-1-to-3-18-issue/21738/24?u=rbremer