This is the SonarQube 4.0.x specific tag. Use it in addition to the [tag:sonarqube] tag if your question is specific to SonarQube 4.0.x — not just 4.x.
SonarQube (formerly Sonar) is a quality management platform focusing on continuous analysis of source code quality.
Information
This tag is specific for the 4.0 version of SonarQube, which was released on the 7th November 2013. See the sonarqube tag for general SonarQube 4.x questions.