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.
There was no build of this for f28 - the unsigned build was moved to shim-unsigned-aarch64 and shim-unsigned-x64. For f29, shim-signed moves to here.