I am searching for a good and useful method to monitor my 40 nodes cloud.

I have tried

- Prometheus + Grafana (with https://github.com/openstack-exporter/openstack-exporter) but it cannot monitor nodes load and cpu usage etc.

and 

- Gnocchi +Collectd + Grafana but it enforces unbelievable load on nodes and make the whole cloud completely unusable!

I've tried to use Graphite + Grafana but I failed.

Do you have any suggestions?

P.S. Where can I find good documentation for TripleO over CentOS? Redhat's is somehow restricted to its own RHOSP. This website is down: http://tripleo.org/

Thanks,

Khodayar