This is a question about Grafana and/or the smokeping_exporter Grafana
dashboard, not Prometheus.
${target:raw} is a Grafana variable expansion, and the :raw suffix is a
format specifier:
https://grafana.com/docs/grafana/latest/dashboards/variables/variable-syntax/#variable-syntax
https://grafana.com/docs/grafana/latest/dashboards/variables/variable-syntax/#raw
If you want multiple Grafana selections to be active at once in a PromQL
query, then in general you need to use regex: *foo{host=~"${target}"}*
Because Grafana understands PromQL it shouldn't be necessary to add a
:regex suffix here, although it's probably OK to add it. It should expand
to something like
*foo{host=~"1\.1\.1\.1|8\.8\.8\.8"}*
The important thing is that you use =~ instead of =.
All this is standard Grafana functionality, and therefore further questions
about this would best be asked in the Grafana Community forum.
If the published smokeping_exporter dashboard allows multiple selections in
its target var, but uses host= instead of host=~, then that's a bug in the
dashboard which you'd need to raise with the author.
However, if the published dashboard only allows a single target selection
and you *modified* it to allow multiple selections, then you broke it. At
this point you've become a Grafana dashboard developer, and again, the
Grafana Community would be the best place to ask for help. It's Grafana
that builds the query; Prometheus can only process whatever query it's
given.
On Thursday 11 January 2024 at 08:01:15 UTC Alexander Wilke wrote:
> Hello,
>
> I am using the smokeping_prober (
> https://github.com/SuperQ/smokeping_prober) v0.7.1 and the provided
> dashboard.json.
>
> For whatever reason the queries contain ".raw" endings for the targets.
> This leads to a problem if I want to show several targets in the same
> graph because targets are not added with "|" in between but with ","
>
> Here is the query with one selected target which is working:
> [image: smoke_ping_one_target.JPG]
>
>
> If I select two or more targets than the query looks like this but not
> data anymore:
> [image: smoke_ping_more_targets_no_data.JPG]
>
> If I remove the ":raw" at the end of the target I do not get any data no
> difference if one or more clients. So this is somehow relevant.
>
>
> My idea was to have any overview panel which shows the latency of several
> smokeping_probes and to compare them. I want to place several "sensors" in
> our DataCenter and they should ping each other. If someone tells me he has
> performance issues with an appliacation I can select the relevant
> zones/probers and can compare if the latency changed or not.
>
> If I want to compare 6 probers and have to scroll through 6 pannels it is
> not so elegant because depending on the latency the scale of the panels is
> different and may lead to wrong assumptions.
>
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