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
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