First uninstall service named "Sonar" while still on previous version of SonarQube. Then update to 4.3 and reinstall the service. Service name should now be "SonarQube". See
Server setting for JVM max memory has been changed
In order to allocate more than 4Gb of memory on 64-bits JVM, the parameter wrapper.java.maxmemory is replaced by :
Alerts are extracted from Quality Profiles to independent Quality Gates. To be documented.