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histograms: Fix counter reset header during merging 

See detailed discussion:
https://github.com/prometheus/prometheus/pull/11864#issuecomment-1403963451

Signed-off-by: beorn7 <beorn@grafana.com>
This commit is contained in:
beorn7 2023-01-25 18:23:10 +01:00
parent 1cfc8f65a3
commit 49c5b1fae4
1 changed files with 6 additions and 2 deletions
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8
storage/merge.go
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@ -533,8 +533,12 @@ func (c *chainSampleIterator) AtFloatHistogram() (int64, *histogram.FloatHistogr
}
t, fh := c.curr.AtFloatHistogram()
// If the current sample is not consecutive with the previous one, we
// cannot be sure anymore that there was no counter reset.
if !c.consecutive && fh.CounterResetHint == histogram.NotCounterReset {
// cannot be sure anymore about counter resets for counter histograms.
// TODO(beorn7): If a `NotCounterReset` sample is followed by a
// non-consecutive `CounterReset` sample, we could keep the hint as
// `CounterReset`. But then we needed to track the previous sample
// in more detail, which might not be worth it.
if !c.consecutive && fh.CounterResetHint != histogram.GaugeType {
fh.CounterResetHint = histogram.UnknownCounterReset
}
return t, fh