Comment 18 for bug 1538011

It's worth noting that the aggregate metadata is user-facing in a sense that there is an API for showing aggregate details, including the aggregate metadata [1]. The primary consumer of the metadata is Nova itself, but it's entirely possible for an end user to write code to create/update/read aggregate metadata. And I get wary of the idea of put data != get data for the end user.

[1] http://developer.openstack.org/api-ref-compute-v2.1.html#showAggregate