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docs: Improve behavior documentation of metricpass (#13883)

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knollet 2023-09-07 21:55:08 +02:00 committed by GitHub
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docs/CONFIGURATION.md
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@ -661,6 +661,12 @@ for time-based filtering. An introduction to the CEL language can be found
are provided in the [language definition][CEL lang] as well as in the
[extension documentation][CEL ext].
**NOTE:** Expressions that may be valid and compile, but fail at runtime will
result in the expression reporting as `true`. The metrics will pass through
as a result. An example is when reading a non-existing field. If this happens,
the evaluation is aborted, an error is logged, and the expression is reported as
`true`, so the metric passes.
> NOTE: As CEL is an *interpreted* languguage, this type of filtering is much
> slower compared to `namepass`/`namedrop` and friends. So consider to use the
> more restricted filter options where possible in case of high-throughput