Re: monitoring apply_latency / commit_latency ?

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On Thu, Mar 30, 2023 at 08:56:06PM +0400, Konstantin Shalygin wrote:
> Hi,
> 
> > On 25 Mar 2023, at 23:15, Matthias Ferdinand <mf+ml.ceph@xxxxxxxxx> wrote:
> > 
> > from "ceph daemon osd.X perf dump"?
> 
> 
> No, from ceph-mgr prometheus exporter
> You can enable it via `ceph mgr module enable prometheus`

Hi Konstantin,

thanks :-)
I understand that grafana graphs are generated from prometheus metrics.
I just wanted to know which OSD daemon-perf values feed these prometheus
metrics (or if they are generated in some other way).


Output for "ceph daemon osd.X perf dump" is quite large; most of the
time I am just looking for some kind of latency indicator, or checking
if there are "slow" bytes in bluestore OSDs. Most of the output lines
get filtered away immediately by the next grep/jq. Can somebody tell me
if asking often (like every second) for full perf dump output could slow
down the OSD?


Regards
Matthias
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