This question is specific to the SonarQube server implementation. It’s completely unrelated to Gradle, so you’re unlikely to get a meaningful answer from Gradle users even if using SonarQube Gradle plugin.
You should be posting somewhere that the SonarSource developers and core SonarQube users review. I would follow the advice previously given by a developer from SonarSource to get help with SonarQube:
Please join SonarQube Google Group to ask for support or ask on StackOverflow.