Clear and short community rules should lead to a good understanding of them. This should result in a low number of personal conflicts in the community and rule violations.
- Percent of active users who have been contacted by a moderator.
- Percent of active users who have been suspended.
If the platform you use allows that, I would recommend tacking rudeness as a special category:
- Percent of active users whose content has been marked as rude or offensive
This is a fragment of a draft of the book “Lessons Learned While Working On Stack Overflow”. Read the full book on kindle or the paperback version.