Hi, I am currently looking into MDS warnings (behind on trimming) on a customer cluster. They recently upgraded to Squid 19.2.3 which seems to have fixed a bug with trimming, so the warning doesn't come that often anymore (if at all currently). But when digging a bit deeper, I noticed these messages in the event get list output: cephfs-journal-tool --rank=cephfs:0 event get list | head 2026-06-18T13:12:22.821+0000 7fec1b5ff280 0 uh oh, unknown log event type 100 length 14 2026-06-18T13:12:22.833+0000 7fec1b5ff280 0 uh oh, unknown log event type 100 length 14 That message is repeated 118 times or so before dumping the actual event list. I looked at the code for 19.2.0 [0] and 19.2.3 [1], in both cases event type 100 seems to be defined: #define EVENT_SEGMENT 100 So why is it unknown? It doesn't appear to have any negative impact, at least noone has complained yet, but I still wanted to ask what this is about. Can I ignore this? Will that go away on its own at some point? Any pointers are appreciated! Thanks! Eugen [0] https://github.com/ceph/ceph/blob/v19.2.0/src/mds/LogEvent.h#L45 [1] https://github.com/ceph/ceph/blob/v19.2.3/src/mds/LogEvent.h#L45