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Signed-off-by: Linas Medziunas <linas.medziunas@gmail.com>
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docs/querying/operators.md
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@ -126,6 +126,25 @@ samples. Operations involving histogram samples result in the removal of the
corresponding vector elements from the output vector, flagged by an
info-level annotation.
### Histogram trim operators
The following binary histogram trim operators exist in Prometheus:
* `</` (trim upper): removes all observations above a threshold value
* `>/` (trim lower): removes all observations below a threshold value
Histogram trim operators are defined between vector/scalar and vector/vector value pairs,
where the left hand side is a native histogram (either exponential or NHCB),
and the right hand side is a float threshold value.
In case the threshold value is not aligned to one of the bucket boundaries of the histogram,
either linear (for NHCB and zero buckets of exponential histogram) or exponential (for non zero
bucket of exponential histogram) interpolation is applied to compute the estimated count
of observations that remain in the bucket containing the threshold.
In case when some observations get trimmed, the new sum of observation values is recomputed
(approximately) based on the remaining observations.
### Comparison binary operators
The following binary comparison operators exist in Prometheus: