For the histogram buckets, is your intention to have a few preconfigured "age" buckets like 0s-15s, 0s-1m, 0s-5m, and so on (cumulative buckets, all starting at 0, as in normal Prometheus histograms), and then a count for how many timestamps you have that fall into each age bucket?
You could make one recording rule for *each bucket*, with all the recording rules sharing the same output metric name. For example, for a bucket with a range of 0s - 1m, you could have this kind of rule: record: my_timestamp_age_bucket expr: count(time() - my_timestamp_seconds <= 60) labels: le: "60" ...and equivalently for the other buckets. If you wanted to have a *non-cumulative* histogram (and don't need to use histogram_quantile() on it), the rule would look like this (e.g. for a bucket from 15s - 1m): record: my_timestamp_age_bucket expr: count(time() - my_timestamp_seconds > 15 <= 60) labels: # some other label(s) here to designate your bucket range Remember to include a catch-all bucket for very long durations with an upper bound of +Inf, so you don't miss recording them. Note that with the "count()" approach I use above, it will only create a bucket time series for buckets with at least one timestamp falling into the bucket, as otherwise "count()" will just return an empty result. If you want to create a bucket with the value of "0" instead, you can append "or vector(0)" to the rule expression: record: my_timestamp_age_bucket expr: count(time() - my_timestamp_seconds <= 60) or vector(0) labels: le: "60" On Mon, Jan 22, 2024 at 4:25 PM 'Suki Sahota' via Prometheus Users < [email protected]> wrote: > I have a metric I'm collecting which is a gauge vector of timestamps. I'd > like to take each one of those timestamps and subtract it from the time now > and turn it into a histogram. Can I do this with recording rules? > > Right now I have a gauge vector of: > <timestamp_1, timestamp_2, ..., timestamp_n>. > > I'd like a histogram of [timeNow - timestamp_i]. I'm specifically looking > to use recording rules. > > Thanks, Suki > > -- > 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/d542aed9-56bf-4737-9720-775b4f27d03dn%40googlegroups.com > <https://groups.google.com/d/msgid/prometheus-users/d542aed9-56bf-4737-9720-775b4f27d03dn%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- Julius Volz PromLabs - promlabs.com -- 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/CAObpH5yS%3D9NCCz_7bRKOPtXxhk-_qkGCLfhVtVkJ_4%3D4YcP2jw%40mail.gmail.com.
