See https://docs.sonarqube.org/display/SONAR/Documentation for current functionality
Millions of Violations
If your SonarQube instance contains a lot of coding rule violations, the migration process can take very long (up to a few days).
Therefore, it is highly recommended to directly migrate to version 3.7.2 that speeds up this migration process.
Minimal supported version of Maven to run analyses is 2.2.1. Version 3.1 is now supported.
Minimal supported version is now IE8.
"Comments & Duplications" widget removed
The "Comments & Duplications" widget was removed. You have to edit your dashboards to add the new "Documentation & Comments" and/or "Duplications" widgets.