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Hey, all.  I'm looking for a way to to filter to a particular aggregate
based on arbitrary VM metadata.  (E.g., maybe FACTER facts from Puppet
that we pass to the VM as metadata.)  Could someone point me toward
documentation that might outline how to accomplish that?  As I see it,
there's really one thing I need to understand -- the rest I can probably
glean from extant filters: how (or if) a filter could access a given
VM's metadata from the API creation request (if that's even possible).

Thanks!

-Ken