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Add index for db.meter by descending timestamp
Fixes bug #1193906 Added an index for db.meter to sort by descending time stamp for class Connection in ceilometer/storage/impl_mongodb.py ensure_index() is used rather than create_index() to be more efficient. This index is needed because get_samples() in ceilometer/storage/impl_mongodb.py sorts by descending timestamp. Without an index, MongoDB will fail to sort if the database is too large. Change-Id: I23070f153ce03a8d6d8c9f17f05e2d5dae38647e
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