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

Hi Justin - I just want to make sure I understand the last sentence:

In future also, metadata with the reserved key prefix may alter the behavior of API operations.

Sounds a bit mysterious. :) Is that just for the reserved aws: key prefix or for any reserved prefix? Will we need to document the precise alterations in behavior? Can you give an example?