I have configured SonarQube plugin in out sandbox, getting below error while testing PR
Sonar data unavailable
Was not able to fetch data for Sonar project "oneid-project:feature/testing-sonarqube-plugin". Either your pull request has not been analyzed yet, a non-existing Sonar project is referenced, you use the new branching feature of SonarQube 6.7 but have not enabled this in the repository settings or you have upgraded SonarQube without restarting the plug-in (disabling and re-enabling in the UPM). You can configure the Sonar project in the repository settings.

Not sure what is the reason.