Re: Use telegraf/influx to detect problems is very difficult

[Miroslav Kalina <miroslav.kalina@xxxxxxxxxxxx>]

    I just briefly peaked into source of module and I suppose it's
    because main design idea is just to forward existing metrics from
    ceph core and do not calculate anything.
    
    To me it seems most users probably use prometheus which doesn't have
    this kind of issue.
    
    Monitor down is also easy as pie, because it's just "num_mon -
    mon_quorum". But there is also metric mon_outside_quorum which I
    have always zero and don't really know how it works.
    
    OSD near full will be probably more tricky, you have to use
    "osd.stat_bytes_used / osd.stat_bytes" and compare it with your own
    configured value (not metric so not exported) per each OSD.
    
    Or you can just watch general cluster health metric (what you should
    anyway) and rise general alarm in this case.
    
    M.

On 11. 12. 19 21:18, Mario Giammarco wrote:

Miroslav replied better for us why "is not so simple" to use math.

And osd down was the easiest. How can I calculate:

- monitor down

- osd near full

?

I do not understand why ceph plugin cannot send to influx all the metrics it has, especially the most useful for creating alarms.

Il giorno mer 11 dic 2019 alle ore 04:58 Konstantin Shalygin <k0ste@xxxxxxxx> ha scritto:

But it is very difficult/complicated to make simple queries because, for
example I have osd up and osd total but not osd down metric.

To determine how much osds down you don't need special metric, because you already

have osd_up and osd_in metrics. Just use math.

k

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Miroslav Kalina
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