The Placement API was introduced to OpenStack in the Newton release.

It allows administrative users to request and modify data about resource providers, inventory records, allocation records and grouping of providers (aggregates).

While the Placement API is currently a directory within the nova source tree, it is an entirely independent service from the OpenStack Compute API. It has its own service endpoint in the Keystone catalog and has its own REST API microversion history.

It would be great to add support to gophercloud for the placement API service.

I'm eager to contribute this if cores give me the go-ahead.