Hello, We are writing to you regarding an issue we encountered while attempting to trace Ceph with LTTng-UST. Below are the steps we have followed so far: 1. *Compiling Ceph with LTTng Support*: - We modified the debian/rules file to enable LTTng support using the following flags: -DWITH_LTTNG=ON and -DWITH_OSD_INSTRUMENT_FUNCTIONS=ON. - The build steps can be found in our GitHub <https://github.com/KedadsaChakib/ceph-configuration/blob/main/build/README.md> repository. 2. *Deploying a Ceph Cluster*: - We deployed the cluster manually (1MON,1MGR,2OSDs). Please find the script here <https://github.com/KedadsaChakib/ceph-configuration/blob/main/cluster/cluster-dep-script.sh> . 3. *Attempting to Trace with LTTng-UST*: - We tried listing the tracepoints using the following command : # lttng list -u - This command did not return any Ceph-related tracepoints: UST events: ------------- NONE 4. *Preloading liblttng-ust-fork.so*: - We attempted to preload liblttng-ust-fork.so before starting the Ceph daemons (MON, OSD, MGR) as follows: # systemctl edit ceph-mon@debian - We added the following configuration: [Service] Environment="LD_PRELOAD=/usr/lib/x86_64-linux-gnu/liblttng-ust-fork.so - After restarting the daemons, we executed lttng list -u, which displayed tracepoints related to the libraries (lttng_ust_lib:*), trace logs (lttng_ust_tracelog:*), and state dump events ( lttng_ust_statedump:*), instead of the expected Ceph-related tracepoints. *Expected Result*: UST events: ------------- PID: 100859 - Name: /path/to/ceph-osd pg:queue_op (loglevel: TRACE_DEBUG_LINE (13)) (type: tracepoint) osd:do_osd_op_post (loglevel: TRACE_DEBUG_LINE (13)) (type: tracepoint) osd:do_osd_op_pre_unknown (loglevel: TRACE_DEBUG_LINE (13)) (type: tracepoint) osd:do_osd_op_pre_copy_from (loglevel: TRACE_DEBUG_LINE (13)) (type: tracepoint) osd:do_osd_op_pre_copy_get (loglevel: TRACE_DEBUG_LINE (13)) (type: tracepoint) ... *Actual Result*: UST events: ------------- lttng_ust_lib:* lttng_ust_tracelog:* lttng_ust_statedump:* We would greatly appreciate any help you could provide to resolve this problem.