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Merged
carlosroman merged 1 commit into from
Aug 17, 2026
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Prepare 5.9.1 release #398

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6 changes: 6 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -2,6 +2,10 @@

[//]: # (comment: Don't forget to update statsd/telemetry.go:clientVersionTelemetryTag when releasing a new version)

# 5.9.1 / 2026-08-14
- [BUGFIX] Prevent a panic when closing a Windows named pipe client that never sent a metric. See [#397][].
- [BUGFIX] Fix an off-by-one error in reservoir sampling that biased which samples were kept once `WithMaxSamplesPerContext()` was reached. See [#395][].

# 5.9.0 / 2026-06-24
- [IMPROVEMENT] Improve aggregator performance: inline shard allocation, FNV-1a metric context hashing, and cache-line padding on shards. See [#389][].
- [IMPROVEMENT] Make `externalEnv` an atomic to reduce lock contention on the sampling hot path. See [#380][], thanks [@KowalskiThomas][].
Expand Down Expand Up @@ -482,6 +486,8 @@ Below, for reference, the latest improvements made in 07/2016 - 08/2016
[#380]: https://github.com/DataDog/datadog-go/pull/380
[#381]: https://github.com/DataDog/datadog-go/pull/381
[#389]: https://github.com/DataDog/datadog-go/pull/389
[#395]: https://github.com/DataDog/datadog-go/pull/395
[#397]: https://github.com/DataDog/datadog-go/pull/397
[@Aceeri]: https://github.com/Aceeri
[@Jasrags]: https://github.com/Jasrags
[@KJTsanaktsidis]: https://github.com/KJTsanaktsidis
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2 changes: 1 addition & 1 deletion statsd/telemetry.go
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Expand Up @@ -19,7 +19,7 @@ var clientTelemetryTag = "client:go"
/*
clientVersionTelemetryTag is a tag identifying this specific client version.
*/
var clientVersionTelemetryTag = "client_version:5.9.0"
var clientVersionTelemetryTag = "client_version:5.9.1"

// Telemetry represents internal metrics about the client behavior since it started.
type Telemetry struct {
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