On Monday, 23 June 2025 at 14:31:34 UTC+1 tejaswini vadlamudi wrote: but with histograms, mainly with Native Histograms, is there a possibility to get Max and Min values for a period of time?
No. If that's not clear from my explanations so far, then I have not done a very good job. With OTEL-based metrics instrumentation, it is possible to record max and min values. See https://opentelemetry.io/docs/specs/otel/metrics/data-model/#histogram Please read the link I posted before: https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/33645 especially the last comment: https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/33645#issuecomment-2514894327 The OTEL histogram's way of reporting max/min values are not compatible with Prometheus. Prometheus histograms are cumulative: that is, they never reset. They are just counters which keep incrementing forever. If they had a min/max then it would be the min/max over all time, which is not useful. You can create a separate timeseries for min/max, but it would not be part of the histogram. It would either have to be min/max over successive timeslots (e.g. 1 minute intervals), or min/max over a sliding window (which is expensive, as you've have to buffer all the samples for that time window). > I think histogram_quantile(0, rate(http_request_duration_seconds[1m])) will give me min value. Is it correct? No, it's not. Again, it seems I have not been explaining this well. Let's say your histogram buckets are: 0-10ms (le="0.01") 10-20ms (le="0.02") 20-30ms (le="0.03") 30-40ms (le="0.04") 40-50ms (le="0.05") 50ms+ (le="inf") A sample comes in with request time of 12.3ms, and this is the fastest over the time period of interest. All this does is add 1 to the 10-20ms bucket (counter) in the histogram. The actual value of 12.3ms is LOST. The only thing you will know from looking at the histogram is that the 10-20ms bucket has incremented, but the 0-10ms bucket has not, and therefore the minimum value is somewhere between 10ms and 20ms. If you use the histogram_quantile(0...) formula you showed, the answer will be "0.01", which I also explained previously with a worked example. This tells you "the minimum value is at least 10ms" - and implicitly not more than 20ms, as that's where the next bucket starts. I think I had better hand over to someone else now. -- 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 prometheus-users+unsubscr...@googlegroups.com. To view this discussion visit https://groups.google.com/d/msgid/prometheus-users/3e31540a-c1cf-4601-8412-b06ed5c0e810n%40googlegroups.com.
