Open Stack

Hi, I have Openstack Liberty running and I have ceilometer running as well.. all good but certain meters like cpu_util are not coming up after days of running.

Its weird because i have quite a few other meters.. like the ones that come from the compute agent but not the ones from the notifier agent.

Is it enough if i install notifier on the compute nodes or do I need to install anything else? 

Thank you for any help,
//Florian