[ceph-users] High RAM usage for OSDs

Hello guys, We are running Ceph Octopus on Ubuntu 18.04. We noticed that some OSDs are using more than 16GiB of RAM. However, the option "osd_memory_target" is set to 4GiB. The OSDs are SSDs and have 2TiB in size each. Have you guys seen such behavior? Are we missing some other configuration or parameter? Or, maybe, is it some memory leak?