Hi Russell, The following are the blueprints I've created based on the Nova V3 API discussions. As requested I've split them into multiple blueprints to make working out when we've actually finished parts of the V3 API work easier. https://blueprints.launchpad.net/nova/+spec/nova-v3-api-filter https://blueprints.launchpad.net/nova/+spec/v3-api-cleanup-misc https://blueprints.launchpad.net/nova/+spec/v3-api-core-as-extensions https://blueprints.launchpad.net/nova/+spec/v3-api-expected-errors https://blueprints.launchpad.net/nova/+spec/v3-api-extension-versioning https://blueprints.launchpad.net/nova/+spec/v3-api-inconsistencies https://blueprints.launchpad.net/nova/+spec/v3-api-return-codes https://blueprints.launchpad.net/nova/+spec/v3-multi-status-support The following is the blueprint for the new API Extension framework https://blueprints.launchpad.net/nova/+spec/v3-api-extension-framework There is an initial WIP patch for the barebones bits of the framework here: https://review.openstack.org/#/c/27276/ Regards, Chris -- cyeoh at au1.ibm.com