The queue of usage events is an API for collecting usage information, but it sounds like it's not as high a layer as you'd like to see. There is also the (new)

The queue of usage events is an API for collecting usage information, but it sounds like it's not as high a layer as you'd like to see. There is also the (new) Ceilometer project which sounds like it implements what you're looking for: https://github.com/stackforge/ceilometer https://github.com/stackforge/ceilometer It is new, so it's probably not as mature as other options, but it has had a lot of activity recently.