See https://docs.sonarqube.org/display/SONAR/Documentation for current functionality
The System Info page provides system statistics, including plugin versions, environmental variables, and data on SonarQube itself.
You can download the info contained in this page as a JSON file using the Download button :
You can view the logs of your SonarQube Server without having to connect to the server hosting your instance directly in the UI by clicking on the "Logs" link on the top right of the System Info page.
In addition, you can change the verbosity of these logs directly in the UI. You don't need to change the sonar.log.level properties available in the sonar.properties file. The change is taken into account immediately, without having to restart your SonarQube Server. Each time your restart your SonarQube Server, the log level is reset to the value specified in sonar.properties.