sonarqube 7.9.1 how to rollback quality profile
There’s a Changelog for your Quality Profiles that lets you see the changes that have been made.
You’ll have to examine the changes and undo them.
In addition to Colin’s answer, you might also backup a quality profile and persist to xml via
Quality Profile dashboard / gearwheel in the upper right corner
and later restore via Quality Profile main dashboard, f.i.
https://yoursonar/profiles Restore button, upper right corner
This is also useful for transferring Quality Profiles to multiple Sonarqube instances
and versioning in Git.