Typically those values are exposed as booleans/states.
For example, mdadm collector in the node_exporter has metrics like this:
# HELP node_md_state Indicates the state of md-device.
# TYPE node_md_state gauge
node_md_state{device="md0",state="active"} 1
node_md_state{device="md0",state="check"} 0
node_md_state{device="md0",state="inactive"} 0
node_md_state{device="md0",state="recovering"} 0
node_md_state{device="md0",state="resync"} 0
You combine this with an "info" metric that tells you about the rest of the
device.
For example, there is `node_os_info` that reads from LSB data.
# HELP node_os_info A metric with a constant '1' value labeled by build_id,
id, id_like, image_id, image_version, name, pretty_name, variant,
variant_id, version, version_codename, version_id.
# TYPE node_os_info gauge
node_os_info{build_id="",id="ubuntu",id_like="debian",image_id="",image_version="",name="Ubuntu",pretty_name="Ubuntu
20.04.2 LTS",variant="",variant_id="",version="20.04.2 LTS (Focal
Fossa)",version_codename="focal",version_id="20.04"} 1
PromQL allows you to do joins, kinda like SQL, in order to match this
information onto an alert.
On Sat, Feb 11, 2023 at 11:02 AM Christoph Anton Mitterer <
[email protected]> wrote:
> Hey.
>
> I wondered whether the following is possible with Prometheus. I basically
> think about possibly phasing out Icinga and do any alerting in Prometheus.
>
> For checks that are clearly metrics based (like load or free disk space)
> this seems rather easy.
>
> But what about any checks that are not really based on metrics?
> Like e.g. check_raid, which gives an error if any RAID has lost a disk or
> similar.
>
> Of course one could always just try to make a metric out of it - above one
> could make e.g. the number of non-consistent RAIDs the metric.
>
> But what one actually wants from such checks is additional (typically
> purely textual) information, like in the above example which HDD
> (enclosure, bay number,... or the serial number) has failed.
> Also I have numerous other checks which test for things which are not
> really related to a number but where the output are strings.
>
> Is there any (good) way to get that done with Prometheus, or is it simply
> not meant for that specific use case.
>
> Thanks,
> Chris.
>
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