The plugin is omitting loaded inactive units

[epierotto]

The plugin is using systemctl --no-legend to list all the services and that command excludes inactive units.

From man systemctl:

       -a, --all
           When listing units, show all loaded units, regardless of their state, including inactive units. When showing unit/job/manager properties,
           show all properties regardless whether they are set or not.

           To list all units installed on the system, use the list-unit-files command instead.