We recently installed SonarQube that runs daily on a server and installed the SonarLint addon for Visual Studio. We noticed that Visual Studio lets you connect to the SonarQube server. However, the SonarLint addon already scans files for you, so I’m not exactly sure what connecting Visual Studio to SonarQube actually does.
Using Connected Mode syncs rules, issues, and exclusions. For example, say you mark an issue as being a false-positive in SonarQube, that issue will no longer appear in SonarLint for any users that have bound to the project on the SonarQube server.