[ovirt-users] oVirt monitoring

Hello, I'm trying to do some performance monitoring on our oVirt and want to ask if someone has any experience with it? Currently I'm trying Red Hat Virutalization tool which has REST API, where you can get statistics per host, vm, disk and nic. Problem is that you cannot get any historical data via rest api (at least I didn't find any way to do it) and almost all metrics are gauge values over some interval (couldn't find it documentation, but it looks like they are updated every 15 s). I surely don't want to query whole environment every 15 seconds and missing some values is also not an option since I could miss some spikes in performance. Any help is appreciated! George