osdmaps not being cleaned up in 12.2.8

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I have a cluster with over 1900 OSDs running Luminous (12.2.8) that isn't cleaning up old osdmaps after doing an expansion.  This is even after the cluster became 100% active+clean:

# find /var/lib/ceph/osd/ceph-1754/current/meta -name 'osdmap*' | wc -l
46181

With the osdmaps being over 600KB in size this adds up:

# du -sh /var/lib/ceph/osd/ceph-1754/current/meta
31G	/var/lib/ceph/osd/ceph-1754/current/meta

I remember running into this during the hammer days:

http://tracker.ceph.com/issues/13990

Did something change recently that may have broken this fix?

Thanks,
Bryan

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