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To get started, pick your project from the top menu. Notice that there are different projects for the master and future branches.
How to use Sonar
SonarQube has a comprehensive user manual available online.
http://docs.sonarqube.org/display/SONARQUBE45/User+Guide
Monitoring metrics through time
From inside a project page, click on the Time Machine menu. This tool allows you to observe the evolution of the code metrics through time. You can pick new versions and time periods to compare from the combo box at the top.