> Hi All,
>
> I've started looking into using pushgateway metrics.
> I tried a variation of the curl example found in the pushgateway git
> readme:
>
> cat <<EOF | curl --data-binary @-
> http://my-prometheus-host:9091/metrics/job/some_job/instance/some_instance
> # TYPE another_metric gauge
> # HELP another_metric Just an example.
> my_metric 6324321
> EOF
>
> I can see the metric appear and a basic query returns the expected value.
> I can also apply basic arithmetic to it and get the expected result e.g.
> my_metric + 100 returns 6324421
>
> However, if i try to use it in arithmetic with other existing gauge
> metrics it always returns an empty result e.g.
>
> my_metric / existing_gauge_metric returns empty query result.
>
> Any ideas what is going on?
It's likely that these two metrics have different labels. Normally,
the labels must match in arithmetic expressions in order to get any
results. If you want to ignore some labels (or only match on some
labels), you need to use ignoring() or on(), as in:
my_metric / on(...) existing_gauge_metric
Both of these are discussed in the "One-to-one vector matches" section
of the PromQL "Operators" documentation,
https://prometheus.io/docs/prometheus/latest/querying/operators/#one-to-one-vector-matches
- cks
--
You received this message because you are subscribed to the Google Groups
"Prometheus Users" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To view this discussion on the web visit
https://groups.google.com/d/msgid/prometheus-users/20210420224310.2928F32036E%40apps1.cs.toronto.edu.
