Code review comment for lp:~justin-fathomdb/openstack-manuals/doc-reserve-metadata-prefix

Jorge: My understanding is that AWS Tags map to OpenStack "Metadata" and vice versa.

(AWS Tags documented here: http://docs.amazonwebservices.com/AWSEC2/latest/UserGuide/index.html?Using_Tags.html)

Although OpenStack might prefer to expose e.g. "cost-last-hour" in a different way (e.g. extensions), this is just about not painting ourselves into a corner by not reserving the "aws:" prefix, in case AWS decides to expose it "their way".