Your package hystrix failed to build from source in current F28. https://koji.fedoraproject.org/koji/taskinfo?taskID=24802979 For details on mass rebuild see https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild
I believe Roman already built the new package: https://koji.fedoraproject.org/koji/buildinfo?buildID=1087141
Martin thanks. The release was publish on stable three days ago: https://bodhi.fedoraproject.org/updates/FEDORA-2018-a1647d6783.