In the releases notes, even for the 4.6 rc, I see:
https://www.ovirt.org/release/4.1.6/
...
OpsTools currently includes collectd 5.7.0, and the write_http plugin is packaged
separately.
But if I check the current state:
yum list collectd-write_http collectd
...
collectd.x86_64
5.7.2-1.el7
@centos-opstools-release
collectd-write_http.x86_64
5.7.2-1.el7
@centos-opstools-release
So I think the warning is not needed any more. One can uses both ovirt and epel without
any special check.