[ceph-users] monitoring apply_latency / commit_latency ?

Hi, I would like to understand how the per-OSD data from "ceph osd perf" (i.e. apply_latency, commit_latency) is generated. So far I couldn't find documentation on this. "ceph osd perf" output is nice for a quick glimpse, but is not very well suited for graphing. Output values are from the most recent 5s-averages apparently. With "ceph daemon osd.X perf dump" OTOH, you get quite a lot of latency metrics, while it is just not obvious to me how they aggregate into apply_latency and commit_latency. Or some comparably easy read latency metric (something that is missing completely in "ceph osd perf"). Can somebody shed some light on this? Regards Matthias