User filters on katello fields break fact values page
If current user has filter set on katello field for view_hosts, fact values page will result in an exception:
"Can't join 'Host::Base' to association named 'lifecycle_environment'; perhaps you misspelled it?"
Clone "Viewers" role to "Restricted viewer".
Edit "Restricted viewer" and add "lifecycle_environment = Library" restriction to view_hosts filter.
Create a user and assign "Restricted viewer" to it.
Log in as this user and go to Monitor -> Facts.