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.
'sonar.authenticator.class' property has been deprecated
The 'sonar.authenticator.class' property has been deprecated. Use the 'sonar.security.realm' property instead.