On Fri, 23 Jul 2021 at 09:04, Marek Skalicky <[email protected]> wrote: > Hi, > I'm running prometheus with lookback-delta=9m and scraping a metric every > 5 minutes. I've seen issue when evaluating > 'increase(ifHCInOctets{network_key="xxx"}[10m])/2' in recording rule. > I've reported that as a bug in > https://github.com/prometheus/prometheus/issues/9092, but I was told the > lookback-delta should be 15m so it's an issue of configuration. > > But when I do the same query in grafana it shows correctly. So does the > lookback-delta have special meaning for recording rules? > My understanding was that the lookback delta is used per individual data > points, so the fact that the query/rule has range vector 10m has nothing to > do with the lookback delta. I have also recording rules doing "the same" > with 1h and 24h range vector and those work fine. > > Could anyone please explain why I should use 15m lookback-delta? >
You shouldn't, https://www.robustperception.io/what-range-should-i-use-with-rate describes what's going on. > > Many thanks, > Marek Skalicky > > -- > 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/c73ad64d-0958-442d-88c5-2d5a6f2a738an%40googlegroups.com > <https://groups.google.com/d/msgid/prometheus-users/c73ad64d-0958-442d-88c5-2d5a6f2a738an%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- Brian Brazil www.robustperception.io -- 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/CAHJKeLq4%3DTe4Wi47vPRYn-nau60M_NFhT1FR1uBEjXgK_Tka8g%40mail.gmail.com.
