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promqltest: Add tests to demonstrate detail of smoothed rate calculation

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This shows that the smoothed rate with an empty range is calculated to
be zero if there is a single sample after the range, but still within
the lookback delta.

In contrast, the smoothed rate with an empty range and a single sample
before the range, but still within the lookback delta, does not exist.

This is inconsistent. In both cases, the rate should either not exist
or be calculated as zero.

Signed-off-by: beorn7 <beorn@grafana.com>
This commit is contained in:
beorn7 2026-03-13 22:12:08 +01:00
parent 8b25b26a76
commit c9689ede2a
1 changed files with 26 additions and 1 deletions
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27
promql/promqltest/testdata/extended_vectors.test vendored
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@ -417,4 +417,29 @@ eval instant at 45s withreset smoothed
withreset 3
eval instant at 30s notregular smoothed
notregular 2
notregular 2
clear
load 1m
metric _ _ _ _ _ _ 1
# smoothed rate with a single point after the range beyond
# lookback delta returns nothing.
eval instant at 0m rate(metric[1m] smoothed)
# smoothed rate with a single point after the range within
# lookback delta is zero.
# TODO(beorn7): Is this intended? Maybe it should return nothing.
# See also below.
eval instant at 3m rate(metric[1m] smoothed)
{} 0
# smoothed rate with a single point before the range beyond
# lookback delta returns nothing.
eval instant at 15m rate(metric[1m] smoothed)
# smoothed rate with a single point before the range within
# lookback delta returns nothing.
# TODO(beorn7): Is this intended? Maybe it should be zero.
# See also above.
eval instant at 8m rate(metric[1m] smoothed)