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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