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Native histograms are not experimental anymore #127

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Oct 22, 2025
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Native histograms are not experimental anymore #127

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9 changes: 4 additions & 5 deletions README.md
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Expand Up @@ -37,8 +37,7 @@ Check out the [OpenMetrics project](https://openmetrics.io/) for the future of
the data model and exposition format used by Prometheus and others.

Note, though, that in an ironic twist of fate, the protobuf-based exposition
format got revived to ease the implementation of experimental support for
native histograms in Prometheus. Therefore, starting with v2.40.0, the
Prometheus server is again capable of ingesting the protobuf-based exposition
format (if the respective feature flag is enabled). Eventually, native
histogram support will be added in some form to OpenMetrics, too.
format got revived to suppert native histograms in Prometheus. Therefore,
starting with v2.40.0, the Prometheus server is again capable of ingesting the
protobuf-based exposition format. Eventually, native histogram support will be
added in some form to OpenMetrics, too.
3 changes: 1 addition & 2 deletions io/prometheus/client/metrics.proto
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Expand Up @@ -76,8 +76,7 @@ message Histogram {

optional google.protobuf.Timestamp created_timestamp = 15;

// Everything below here is for native histograms (also known as sparse histograms).
// Native histograms are an experimental feature without stability guarantees.
// Everything below here is for native histograms (formerly known as sparse histograms).

// schema defines the bucket schema. Currently, valid numbers are -4 <= n <= 8.
// They are all for base-2 bucket schemas, where 1 is a bucket boundary in each case, and
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