This was already partially answered in https://stackoverflow.com/questions/54148451
But not sufficiently, so I'm asking here and in the Prometheus Google Group: https://groups.google.com/d/topic/prometheus-users/JxepDL9eosQ/discussion Here is the image of the graph: [image: Screen Shot 2020-03-30 at 06.18.07.png] On Monday, March 30, 2020 at 10:21:01 AM UTC-4, Weston Greene wrote: > > > I have the Recording rule pattern: > ```yaml > - record: last-update > expr: | > timestamp(changes(metric-name[450s]) > 0) > or > last-update > ``` > > However, that doesn't work. The `or last-update` part doesn't return a > value. > > I have tried using an offset, > ` or (last-update offset 450s)`, > to no avail. > > > My evaluation frequency is 5 minutes (the frequency that prometheus runs > my Recording rules). I tried the 7.5 minutes offset because I theorized > that the OR was attempting to write last-update as last-update but > last-update was null in that second; if the OR were to attempt writing > last-update as the value it was during it's previous evaluation, then it > should find a value in last-update, but that returned no value as well. > > > This is what the metric looks like graphed: > > [choppy rather than a complete staircase][1] (I don't have enough > reputation to post pictures...) > > > > Thank you in advance for your help. > > Why I care: > If a time series plateaus for an extended period of time then I want to > know as that may mean it has begun to fail to return accurate data. > > > [1]: I think the image link is preventing me from posting > -- 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 on the web visit https://groups.google.com/d/msgid/prometheus-users/5afd8596-8dcd-4c3a-b89d-a6fc08da3ce0%40googlegroups.com.
