Warning about non-existing (?) large omap object

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Hello everyone,

For the second time now, we have a warning on a Ceph cluster about a large
omap object.

This object is supposed to be in default.rgw.log, except after running
listomapkeys on every object of that pool (`for i in `rados
--cluster=ceph-par -p default.rgw.log ls`; do echo -n "$i:"; rados
--cluster=ceph-par -p default.rgw.log listomapkeys $i |wc -l; done`), we
get 0 for every object.

As I understand it, objects in that pool are short-lived so the object
which triggered the warning does not even exist anymore. Am I mistaken?

The first time, we tried quite a lot of things, like triggering a deep
scrub on the relevant pg, even looking into other pools (just in case) if
we could find object with large omap objects (and we did not).

The warning ended up going away on its own after a bit less than a week
iirc.

Is this a bug? Is there a way to clear this warning (if it is indeed about
a non-existing object)?

Thanks,
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