I've thought about indexing objects elsewhere as well. One thought I had was hooking into the HTTP flow where a PUT or DEL would update the objects in some kind of database (async of course). We could also gather stats with GET and POST. Initially, my thoughts were to hook into haproxy since we already use it, but possibly RGW if that is an option. That way it would always be up to date and not have to do big scans on the buckets (our buckets would not perform well with this). I haven't actually gotten to the implementation phase of this idea.