Safe to remove objects from default.rgw.meta ?

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Hi all,

We have an S3 cluster with >10 million objects in default.rgw.meta.

# radosgw-admin zone get | jq .metadata_heap
"default.rgw.meta"

In these old tickets I realized that this setting is obsolete, and
those objects are probably useless:
   http://tracker.ceph.com/issues/17256
   http://tracker.ceph.com/issues/18174

We will clear the metadata_heap setting in the zone json, but then can
we simply `rados rm` all the objects in the default.rgw.meta pool?

The objects seem to come in three flavours:

   .meta:user:dvanders:_KpWMw94jrX75PgAfhDymKTo:2
   .meta:bucket:atlas-eventservice:_byPmpJS9V9l7DULEVxlDC2A:1
   .meta:bucket.instance:atlas-eventservice:61c59385-085d-4caa-9070-63a3868dccb6.3191998.599860:_PQCKPJVTzvtwgU41Dw0Cdx6:1

Cheers, Dan
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