One of the problems we have in Nectar is reporting on capacity and usage of nova. We have ~1000 compute nodes and these come and go. The Openstack Placement service seems like a good place to extract capacity and usage information from nova so I thought I'd see what it could do. First problem is there is no placement client. I found the osc-placment project but this isn't that useful as it is just an openstack client plugin and not a python library like the other clients. I've written a custom client before for an internal project so I created a very simple client that can get resource provider usage and capacity. In placement a resource provider maps directly to a compute node in nova. Now we have the means to query this information I wrote a custom Ceilometer poller to collect this information periodically. Once this was collecting data I needed to configure Ceilometer and Gnocchi to ingest the notifications that my new poller was generating. In Ceilometer I ne...