The Sonar(-Qube) plugin creates a linked gif  to the SonarQube project within the Jenkins Build History.

The link is created if exactly one project is scanned by SonarQube during the Job. If more than one project are scanned by SonarQube, then one gif is displayed but no link is created.

In my humble opinion, an improvement would be to add as many gifs as projects scanned linking each gif to the respective SonarQube project.