(I copy pasted the wrong bit of screen from when I had eval_time: 5m30s,
but it doesn't affect the result)
On Friday, 13 October 2023 at 12:30:16 UTC+1 Brian Candler wrote:
> I've been using "promtool test rules" to see how rate() behaves with a
> timeseries that has recently started, and I am struggling to understand it.
>
> What would you think the following test should return?
>
> ```
> evaluation_interval: 1m
>
> tests:
> - input_series:
> - series: foo
> values: '_ _ _ 17 137'
> interval: 1m
>
> promql_expr_test:
> - expr: rate(foo[5m])
> eval_time: 4m30s
> exp_samples:
> - value: 2 # I expected: increase of 120 in 60 seconds
> labels: ""
> ```
>
> Result (with prometheus 2.45.0):
>
> ```
> FAILED:
> expr: "rate(foo[5m])", time: 5m30s,
> exp: {} 2E+00
> got: {} 6.566666666666666E-01
> ```
>
> That result is 197/300, and I have no idea how it derives this value!
>
> Now change the input data to:
>
> ```
> values: '_ _ _ 1017 1137'
> ```
>
> and the result is 0.8 (=240/300, 192/240 or 48/60) - even though the input
> values are still 120 apart.
>
> Any clues as to how it gets these results?
>
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