I saw a case where Sonar analysis was being requested by a government agency where software was built by consultants. From the government agency's point of view it made some sense to ensure that the code delivered by the consultants wasn't full-on spaghetti.

However, I saw it causing similar turd polishing behaviour: Sensible code needing to be changed because it exceeded some obstinate metric, any kind of code movement causing existing issues to appear as "new", false positives due to incomplete language feature support, etc.