Upgrade process can take a while depending on the size of projects portfolio. To monitor the process, checks the logs and / or the console.
Migration is completed when an analysis has been run on project. Only at that point will you get new functionality working for sure.
Release 2.3 Upgrade Notes
Some findbugs violations have been missing in previous versions (see SONAR-1666). A consequence is that some rules can generate more violations on the same codebase.
The profile "Sonar way with Findbugs" includes new rules (see SONAR-1534). Projects using this profile can have much more violations for the same codebase.
The rule CloneMethodMustImplementCloneable was badly configured, so it has never been executed (see SONAR-1805). This rule is activated in the profile "Sonar way", so some projects can have some new violations with the same codebase.
Some member variables, for example loggers, are now excluded from LCOM4 (see SONAR-1641). This metric can vary on some classes compared to previous versions.
Not compatible plugins
Plugins Rules Meter and Web (version 0.1 only) are not compatible. They must be uninstalled before starting the SonarQube server. Delete the files from /extensions/plugins/.