Issue with the Update Center
This applies only if you upgrade from version 3.5.X to version 3.6. There is not such an issue while upgrading from a version prior to 3.5.
Information provided by the update center is not reliable. Please check the plugin compatibility matrix before upgrading.
Migration of the database takes longer than usual
Due to the migration of the concept Violations and Reviews to Issues, the migration of the database takes longer than usual.
Violations and Reviews => Issues
The concept of Violations and Reviews has been merged into a single concept: Issues. Due to this change, some metrics have been removed, others have been added. For example, the 'Unreviewed violations' metric has been removed. If you are using it in some widgets or in alerts, you have to replace it by 'Open issues'.
sonar.authenticator.class property has been deprecated
sonar.authenticator.class property has been deprecated. Use the
sonar.security.realm property instead.