Comment 3 for bug 1258911

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Julie Pichon (jpichon) wrote : Re: Havana 2013.2.1 RC: Resource Usage shows traceback (HTTPInternalServerError)

Additional information:

The SQLAlchemy backend is supported although Ceilometer users should be aware that it doesn't have feature parity with the mongo backend.

Notably it doesn't support features like the metadata-constrained querying of statistics required by the 'Resource Usages' panel. Horizon and alarming need to make this kind of queries.

There's no way for Horizon to see which backend is in use so, it seems it will be up to administrators to be aware of the features they need when installing Ceilometer...

The version of mongodb available in Ubuntu 12.04 is too old, which is why the devstack default was switched to mysql.