We have released an update to the centos-release that changes some of the architectures to use mirrorlist.centos.org (which also uses external mirrors) .. instead of having all alternative arches use only mirror.centos.org. This should male updates happen faster for these arches as it spreads the load from our mirror.centos.org servers (normally 20-30 worldwide mirrors) to more than 600 world wide mirrors in 83 countries in mirrorlist. The files in this release are (only the applicable rpm will install on your CentOS instance, based on its architecture): centos-release-7-5.1804.5.el7.centos.a.aarch64.rpm centos-release-7-5.1804.5.el7.centos.p.ppc64.rpm centos-release-7-5.1804.5.el7.centos.p9.ppc64le.rpm centos-release-7-5.1804.5.el7.centos.p.ppc64le.rpm centos-release-7-5.1804.5.el7.centos.i.i686.rpm centos-release-7-5.1804.5.el7.centos.x86_64.rpm
All these RPMs are built from the same Source RPM: http://vault.centos.org/7.5.1804/updates/Source/SPackages/centos-release-7-5...
You can also get the centos-release sources from these git repos:
SPEC file and patches: https://github.com/CentOS/sig-core-AltArch/tree/master/centos-release
Exploded Tarball: https://github.com/CentOS/sig-core-AltArch/tree/master/centos-release-repo
Thanks, Johnny Hughes