SCM data are tightly integrated to SonarQube 2.7 when the SCM Activity plugin version 1.2 (or higher), is installed. Previous versions of this plugin are not supported anymore and must be manually uninstalled before upgrading.
Existing plugin configuration will be lost.
The Clover Plugin is not packaged anymore in the standard distribution. It must be installed from update center after server startup (see SONAR-2145).
See Installing SonarQube on AIX, HPUX or Solaris