CentOS 7.5.1804 is now officially available. See announce here:
https://lists.centos.org/pipermail/centos-announce/2018-May/022829.html
Users: I suggest to upgrade in order to get latest features, fixes and security fixes. Just a note for ppc64le users, there's a known bug with libguestfs requiring qemu-kvm-ma instead of qemu-kvm that may cause upgrade issues. This should be fixed in next update which should land in CentOS in ~2 weeks.
Then please update to latest 4.1 and then to oVirt 4.2 + CentOS 7.5 as soon as you can.
Devel: please cross check your jenkins jobs, especially those having to do something with 4.1 since CentOS 7.5 is not supporting oVirt 4.1 anymore. See above.