I followed some other suggested steps, and have this:
root@cnx-17:/var/log/ceph# zcat ceph-osd.178.log.?.gz|fgrep Large
2019-10-02 13:28:39.412 7f482ab1c700 0 log_channel(cluster) log [WRN] : Large omap object found. Object: 2:654134d2:::mds0_openfiles.0:head Key count: 306331 Size (bytes): 13993148
root@cnx-17:/var/log/ceph# ceph daemon osd.178 config show | grep osd_deep_scrub_large_omap
"osd_deep_scrub_large_omap_object_key_threshold": "200000",
"osd_deep_scrub_large_omap_object_value_sum_threshold": "1073741824",
root@cnx-11:~# rados -p cephfs_metadata stat 'mds0_openfiles.0'
cephfs_metadata/mds0_openfiles.0 mtime 2019-10-06 23:37:23.000000, size 0
2019-10-02 13:28:39.412 7f482ab1c700 0 log_channel(cluster) log [WRN] : Large omap object found. Object: 2:654134d2:::mds0_openfiles.0:head Key count: 306331 Size (bytes): 13993148
root@cnx-17:/var/log/ceph# ceph daemon osd.178 config show | grep osd_deep_scrub_large_omap
"osd_deep_scrub_large_omap_object_key_threshold": "200000",
"osd_deep_scrub_large_omap_object_value_sum_threshold": "1073741824",
root@cnx-11:~# rados -p cephfs_metadata stat 'mds0_openfiles.0'
cephfs_metadata/mds0_openfiles.0 mtime 2019-10-06 23:37:23.000000, size 0
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