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docs(changelog): add entry for UTF-8 validation change
Signed-off-by: Kemal Akkoyun <kemal.akkoyun@datadoghq.com>
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‎CHANGELOG.md‎

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## Unreleased
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* [CHANGE] prometheus: Name validation now always uses the UTF-8 scheme instead of the deprecated `model.NameValidationScheme` global. Default behavior is unchanged; code that set `NameValidationScheme = LegacyValidation` no longer gets legacy enforcement at metric, label, and push-grouping construction. #2051
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* [FEATURE] HTTP handlers created by `promhttp` package now support metrics filtering by providing one or more `name[]` query parameters. The default behavior when none are provided remains the same, returning all metrics. #1925
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* [BUGFIX] promhttp: `InstrumentHandlerDuration` and `InstrumentHandlerCounter` no longer panic when given an observer/counter that does not implement `ExemplarObserver`/`ExemplarAdder` (e.g. a `SummaryVec`). The exemplar is dropped and the value is recorded via the plain `Observe`/`Add` path, matching the safe-cast already used by `Timer.ObserveDurationWithExemplar`. #2005
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