There is a proposal[1] in upstream GlusterFS to drop 32-bit arches.

The original proposal was to drop 32-bit with GlusterFS-7. GlusterFS-7 will land in Fedora 31/rawhide soon. More than likely though it will not be official until GlusterFS-8, which will probably land, accordingly, after Fedora 31 GA in Fedora 32/rawhide.