Hi, I have upgraded my test and production cephadm-managed clusters from 16.2.14 to 16.2.15. The upgrade was smooth and completed without issues. There were a few things which I noticed after each upgrade: 1. RocksDB options, which I provided to each mon via their configuration files, got overwritten during mon redeployment and I had to re-add mon_rocksdb_options back. 2. Monitor debug_rocksdb option got silently reset back to the default 4/5, I had to set it back to 1/5. 3. For roughly 2 hours after the upgrade, despite the clusters being healthy and operating normally, all monitors would run manual compactions very often and write to disks at very high rates. For example, production monitors had their rocksdb:low0 thread write to store.db: monitors without RocksDB compression: ~8 GB/5 min, or ~96 GB/hour; monitors with RocksDB compression: ~1.5 GB/5 min, or ~18 GB/hour. After roughly 2 hours with no changes to the cluster the write rates dropped to ~0.4-0.6 GB/5 min and ~120 MB/5 min respectively. The reason for frequent manual compactions and high write rates wasn't immediately apparent. 4. Crash deployment broke ownership of /var/lib/ceph/FSID/crash /var/lib/ceph/FSID/crash/posted, despite I already fixed it manually after the upgrade to 16.2.14 which had broken it as well. 5. Mgr RAM usage appears to be increasing at a slower rate than it did with 16.2.14, although it's too early to tell whether the issue with mgrs randomly consuming all RAM and getting OOM-killed has been fixed - with 16.2.14 this would normally take several days. Overall, things look good. Thanks to the Ceph team for this release! Zakhar