[ceph-users] Retrieve number of read/write operations for a particular file in Cephfs

Hi, I have been studying the document from Ceph and Rados but I could not find any metrics to measure the number of read/write operations for each file. I understand that Cephfs is the front-end, the file is going to be stored as an object in the OSD and I have found that Ceph provides a Cache Tiering feature which also requires the monitor for read/write operation for each object. Could someone please give me guidance on how this is achieved? Thanks. Best regards, Le Thanh Son