In the sample generator.yml / snmp.yml in the "mikrotik" MIB, you can see
how sysDescr is obtained; you should be able to get sysName in the same
way. As shown, it is presented in its own separate metric, e.g.
sysDescr{sysDescr="RouterOS RB4011iGS+"} 1
I can make use of this with a PromQL N:1 join. For example,
rate(ifHCInOctets[2m])
becomes
rate(ifHCInOctets[2m]) * on(instance) group_left(sysDescr) sysDescr
which gives the same results vector but with an extra sysDescr label (for
those devices that have a corresponding sysDescr timeseries).
It would be conventional to put all the static information like sysName,
sysDescr, sysLocation, sysObjectID, sysContact, sysServices into a single
metadata metric, and then access it using similar queries. For more info see
https://www.robustperception.io/how-to-have-labels-for-machine-roles
https://www.robustperception.io/exposing-the-software-version-to-prometheus
https://www.robustperception.io/left-joins-in-promql
https://prometheus.io/docs/prometheus/latest/querying/operators/#many-to-one-and-one-to-many-vector-matches
Sorry, I don't have a ready-made snmp_exporter config to generate this
metric for you - but if you do create it, please share, as it would be
useful - or submit it as a PR for the sample config, now that snmp_exporter
allows multiple modules to be polled for a single device. (I don't know why
sysDescr is present only in the Mikrotik MIB, when it's generally useful).
If the question is "how can I put sysName as a distinct label on *all* the
other metrics for a device?", then I don't know how or if it can be done,
but I'd advise against it anyway: putting it all into a separate metric
that you cross-reference avoids massive duplication of labels. Also, this
metadata timeseries is a useful thing in itself: you can query it to find
out how many devices have a particular sysObjectID or sysLocation, for
example.
On Thursday, 30 November 2023 at 18:40:24 UTC Kordován Szabolcs wrote:
> Hi,
>
> Does somebody have a solution to add sysname as label to a metric?
> Please share an example generator.yml.
>
> Thanks,
> Szabolcs
>
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