Hello,
an environment with engine in 4.1.2 and 3 hosts too (updated all from 4.0.5 3 days ago).
In web admin gui the 3 hosts keep the symbol that there are updates available.

In events message board I have

Check for available updates on host ovirt01.localdomain.local was completed successfully with message 'found updates for packages rubygem-fluent-plugin-collectd-nest-0.1.3-1.el7, rubygem-fluent-plugin-viaq_data_model-0.0.3-1.el7'.

But on host:

[root@ovirt01 qemu]# yum update
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
 * base: it.centos.contactlab.it
 * epel: mirror.spreitzer.ch
 * extras: it.centos.contactlab.it
 * ovirt-4.1: ftp.nluug.nl
 * ovirt-4.1-epel: mirror.spreitzer.ch
 * updates: it.centos.contactlab.it
No packages marked for update
[root@ovirt01 qemu]# 

And 
[root@ovirt01 qemu]# rpm -q rubygem-fluent-plugin-collectd-nest rubygem-fluent-plugin-viaq_data_model
package rubygem-fluent-plugin-collectd-nest is not installed
package rubygem-fluent-plugin-viaq_data_model is not installed
[root@ovirt01 qemu]# 

Is it a bug in 4.1.2? Or should I manually install these two packages?

Thanks,
Gianluca