We are willing to have downsampling in Prometheus too in the future. I would merge that pull request.
Le lun. 15 nov. 2021, 15:19, Vilius Pranckaitis <[email protected]> a écrit : > *TL;DR*: ability to set a custom lookback delta for a query would be > useful when time series have drastically different resolutions. > > --- > > Currently, Prometheus allows configuring lookback delta through > configuration flag. This works well if the resolutions/scrape intervals of > time series are similar, but is inconvenient if they differ a lot. E.g. if > we had two time series, one with a datapoint each hour and another one with > a datapoint each minute, a lookback of 2h would work for the first one, but > would be way too big for the second one. > > This impacts looking at downsampled data greater than 5 minutes (the > default lookback period) which both Thanos and M3 frequently keep > (depending on user configuration). Both support downsampling data to user > configured resolutions, thus lookback delta should be selected according to > what resolution is being queried when querying downsampled data. Both > Thanos and M3 depend on Prometheus and use `promql.Engine` for executing > queries, which doesn't allow setting custom lookback for a particular query. > > While I understand that this might be more relevant for M3 and Thanos than > for Prometheus, just wanted to check what the maintainers of Prometheus > think about this. If this seems useful, someone from M3 should be able to > submit a PR (we have already looked at the code and it doesn't look like it > needs huge changes). > > -- > 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 on the web visit > https://groups.google.com/d/msgid/prometheus-developers/84c03b13-25d7-479c-b678-44cd8625f2c0n%40googlegroups.com > <https://groups.google.com/d/msgid/prometheus-developers/84c03b13-25d7-479c-b678-44cd8625f2c0n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- 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 on the web visit https://groups.google.com/d/msgid/prometheus-developers/CAFJ6V0p-_k_Yjy_gUdvHaogxZz%3D7DeNEMM7zz7uBYD%2BYBA%2B6bw%40mail.gmail.com.
