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.
rubygem-actionpack-2_1_1-2_fc10:EL-5:rubygem-actionpack-2.1.1-2.fc10.src.rpm:1235750305 rubygem-actionpack-2_1_1-6_el5:EL-5:rubygem-actionpack-2.1.1-6.el5.src.rpm:1272619780