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 [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/prometheus-users/5afd8596-8dcd-4c3a-b89d-a6fc08da3ce0%40googlegroups.com.
