If you have any filters configured to ignore some puppet class name pattern by Foreman in the file /usr/share/foreman/config/ignored_environments.yml (on Ubuntu), it can be useful to have access to a list of ignored puppet classes.

Last week, I had a lot of trouble debugging why my class wasn't imported in Foreman, adding some debug level to the foreman did not help. A specific ignore pattern was applied to my class name and so, my class could not be imported.