These two fields allow to specify a different default assignee for ticket opened against this package in bugzilla. Note: The EPEL field is always displayed for packages in the 'rpms' namespace regardless of whether it is used in bugzilla or not.
Test2 normally uses unique IDs generated by appending PID, thread ID, and an incrementing integer. These work fine most of the time, but are not sufficient if you want to keep a database of events, in that case a real UUID is much more useful.