On 06.10.22 14:45, 'Fabian Stäber' via Prometheus Developers wrote: > > Great question from the CNCF Slack: What's the reason why we don't allow > Exemplars for _count in Summary metrics? > > What do you think? Any reason why Exemplars don't work in _count in > Summaries? Would that be something we could consider supporting?
The _count of a Summary _and_ the _count of a Histogram (both conventional as well as the new native ones) is essentially a counter within the larger "structured" metric of a Summary/Histogram. >From that perspective, it should have the option of attaching an examplar, as a regular Counter has, too. My speculation why it doesn't in OpenMetrics: In an OM Histogram, the +Inf bucket fulfills exactly the same function as the _count (spec says: "The +Inf bucket counts all requests.") So if you would like an examplar on the _count of a Histogram, you can as well use an exemplar on the +Inf bucket. That obviously doesn't help in the case of a Summary, but I guess the rationale is that Histograms are generally to be preferred over Summaries, and therefore didn't get the thourough treatment when it came to exemplars. However, even if you really dislike the precalculated quantiles in Summaries, there is still the case of a Summary without quantiles. I think adding exemplars to such a Summary is as much needed as adding exemplars to any regular Counter. -- Björn Rabenstein [PGP-ID] 0x851C3DA17D748D03 [email] bjo...@rabenste.in -- You received this message because you are subscribed to the Google Groups "Prometheus Developers" group. To unsubscribe from this group and stop receiving emails from it, send an email to prometheus-developers+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/prometheus-developers/Y06klFkG1yubFGmE%40mail.rabenste.in.
