neutron-lib/releasenotes/notes/expose-and-enhance-callback...

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---
features:
- Neutron's callback API found in ``neutron.callbacks.*`` is now exposed
in ``neutron_lib.callbacks.*``. In addition, a set of event payload objects
are now available for use in transporting event payload data in a
standardized way.
- A test fixture is provided for isolating the global callback manager in
``neutron_lib.callbacks.registry``. For more details see the comments in
``neutron_lib.fixture.CallbackRegistryFixture``.
deprecations:
- The use of ``neutron_lib.callbacks.registry.notify()`` and
``neutron_lib.callbacks.manager.CallbacksManager.notify()`` is deprecated in
favor of their ``publish()`` counterparts and will be removed in
the "Queens" release time-frame.