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["Kevin L. Mitchell" <kevin.mitchell@xxxxxxxxxxxxx>]

Greetings.  Changes have recently been made to the nova API which
deprecate the old RequestExtension and ActionExtension classes in favor
of ControllerExtension.  For now, the old-style extensions will work,
but I am currently working on a patch that will remove them entirely
(and, by extension, also remove ExtensionMiddleware, which will remove
the need for LazySerializationMiddleware).

Any third-party extensions should probably be updated to use the new
ControllerExtension interface soon-ish.  For examples of how this may be
done, check out https://review.openstack.org/#change,3020 and
https://review.openstack.org/#change,3049 (ActionExtension and
RequestExtension conversion examples, respectively).

(Just FYI, I'm leaving do-nothing deprecated versions of
ExtensionMiddleware and LazySerializationMiddleware; this will give
people breathing space to update their api-paste.ini files.)
-- 
Kevin L. Mitchell <kevin.mitchell@xxxxxxxxxxxxx>