The difference should work - just remove the cluster from by(...) list:
histogram_quantile(0.50, sum(rate(ampq_bucket{cluster="first"}[15s)) by
(le))
-
histogram_quantile(0.50, sum(rate(ampq_bucket{cluster="second"}[15s)) by
(le))
See more details about time series matching during binary operator
execution in PromQL -
https://prometheus.io/docs/prometheus/latest/querying/operators/
On Thu, Feb 11, 2021 at 12:56 PM Hozapero <[email protected]>
wrote:
> We have a histogram metric with lots of "le" bucket. I usually use
> histogram_quantile to see 50th percentile for this, etc. as such:
>
> histogram_quantile(0.50,
> sum(rate(amqp_bucket{env="prod"}[$__rate_interval])) by (cluster,le))
>
> We have a few clusters which run the same service with the same metrics. I
> would like to see a difference comparison (to see how much faster/slower
> the calls are in an another cluster for the same services).
>
> Is there any way to do difference with histogram_quantiles?
> Something like
>
> histogram_quantile(0.50, sum(rate(ampq_bucket{cluster="first"}[15s)) by
> (cluster,le))
> -
> histogram_quantile(0.50, sum(rate(ampq_bucket{cluster="second"}[15s)) by
> (cluster,le))
>
>
> Thanks.
>
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--
Best Regards,
Aliaksandr Valialkin, CTO VictoriaMetrics
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