I have upgrade my test env to FM-1.18-RC3 and now I can't create any VM anymore using my oVirt-4.2.4 environment.
The following error is thrown:
2018-07-05T10:42:31 [I|app|f694e] Current user: admin (administrator)
2018-07-05T10:42:31 [I|app|f694e] Rendered compute_resources_vms/form/ovirt/_base.html.erb (70.2ms)
2018-07-05T10:42:31 [I|app|f694e] Rendered hosts/_compute_detail.html.erb (76.5ms)
2018-07-05T10:42:31 [I|app|f694e] Rendered hosts/_compute.html.erb (249.1ms)
2018-07-05T10:42:31 [W|app|f694e] Failed to render compute resource template
ActionView::Template::Error: undefined method `sockets' for #<Fog::Compute::Ovirt::Server:0x00000000097e9e98>
/opt/theforeman/tfm-ror51/root/usr/share/gems/gems/actionview-5.1.6/lib/action_view/helpers/tags/base.rb:40:in `public_send'

system is up to date as of 5-7-2018 and restarted for good measure.