Hi, I'm working on adding exemplar support for histograms to a Haskell prometheus client. I wanted to run my implementation by Prometheus folks to see if this all sounds correct:
1. For a given histogram with 5 buckets, store up to 1 exemplar per bucket. Don't store exemplars for +Inf samples. 2. There should be a minimum retention period, such that if you store two exemplars for the same bucket back-to-back, only the first exemplar is stored. My understanding is there are two main purposes of this: a. Store fewer exemplars in prometheus b. Letting callers know up-front if an exemplar is likely to make it to prometheus, so that they can sample the trace. 3. There should be a maximum retention period, such that an exemplar is no longer sent to prometheus if it's e.g. older than a minute. I'm less clear on why this is desired, but want to give a good explanation in docs. WIP PR here: https://github.com/fimad/prometheus-haskell/pull/74 -- 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 [email protected]. To view this discussion visit https://groups.google.com/d/msgid/prometheus-developers/16f4d401-d817-4477-9c31-f991bd1fe6bbn%40googlegroups.com.
