When you upgrade to Grouper 2.5 from Grouper 2.4, you will need to do some changes and instructions.
This wiki is about upgrading from Grouper 2.5.X to 2.5.Y.
If there is a long running task that needs to be run (e.g. indexing audit records into an audit table), those can be handled by the "other job upgrade tasks daemon"
If there are short running tasks (e.g. DDL changes), these can be run at startup.
This assumes: