The WBQC README header contains a “coverage” badge whose current status is “unknown”; clicking the badge leads you to a Coveralls 404 page. Did the Coveralls project get lost accidentally, and we should try to restore it? Or should we just remove the badge?
Change 372401 had a related patch set uploaded (by Lucas Werkmeister (WMDE); owner: Lucas Werkmeister (WMDE)):
[mediawiki/extensions/WikibaseQualityConstraints@master] Remove src_dir from .coveralls.yml