since the discussion "how big should my DB device be" comes up quite
often: would it be possible to add
(sum(omap) + sum(meta)) / sum(data)
to the telemetry module?
And probably some filter to only run it on clusters that are actually
in real use? Because it starts out with 1 GB per OSD allocated. So
maybe only do this if data / osds > 100GB? Or just subtract 1 GB from
Background is that the current recommendation in the docs (4-10%)
doesn't match up with my experience (~0.1% - ~2%) at all.
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