After upgrading to 13.12 or 14.0 our code quality issues have disappeared and the merge request widget always shows “No changes to code quality”.
We run our self-managed GitLab using the Docker images and use the free version. When on 13.11 the quality issues worked fine. Upgrading to 13.12 made the quality issues disappear. Downgrading to 13.11 again made the issues visible again. We hoped that 14.0 would have solved the issue but after upgrading from 13.11 to 14.0 (via 13.12) the quality issues disappeared again. Also, I believe we have had the problem of disappearing quality issues in an other version prior 13.11 but I am not sure which version that was. I get the feeling that the problem might be related to the process of upgrading itself, and not to a particular version.
I am not sure whether this is a GitLab bug. I searched for an issue in the tracker but no one reported it yet although there seem to exist some old related issues. If everyone would have this problem I would expect an issue to already be filed. Also I looked into some log files to see whether there was an exception relating to code quality reports but I could not find one. But I am not absolutely sure where to look. Is it possible we hit a bug? Is this a known problem?