Sourced from github.com/prometheus/client_golang's releases.

v1.23.1 - 2025-09-04

This release is made to be compatible with a backwards incompatible API change in prometheus/common v0.66.0. There are no functional changes.

• [release-1.23] Upgrade to prometheus/common v0.66 by @​aknuds1 in prometheus/client_golang#1866
• [release-1.23] Cut v1.23.1 by @​aknuds1 in prometheus/client_golang#1867

Full Changelog: https://github.com/prometheus/client_golang/compare/v1.23.0...v1.23.1

v1.23.0 - 2025-07-30

• [CHANGE] Minimum required Go version is now 1.23, only the two latest Go versions are supported from now on. #1812
• [FEATURE] Add WrapCollectorWith and WrapCollectorWithPrefix #1766
• [FEATURE] Add exemplars for native histograms #1686
• [ENHANCEMENT] exp/api: Bubble up status code from writeResponse #1823
• [ENHANCEMENT] collector/go: Update runtime metrics for Go v1.23 and v1.24 #1833
• [BUGFIX] exp/api: client prompt return on context cancellation #1729

... (truncated)

Sourced from github.com/prometheus/client_golang's changelog.

1.23.1 / 2025-09-04

This release is made to be compatible with a backwards incompatible API change in prometheus/common v0.66.0. There are no functional changes.

1.23.0 / 2025-07-30

• [CHANGE] Minimum required Go version is now 1.23, only the two latest Go versions are supported from now on. #1812
• [FEATURE] Add WrapCollectorWith and WrapCollectorWithPrefix #1766
• [FEATURE] Add exemplars for native histograms #1686
• [ENHANCEMENT] exp/api: Bubble up status code from writeResponse #1823
• [ENHANCEMENT] collector/go: Update runtime metrics for Go v1.23 and v1.24 #1833
• [BUGFIX] exp/api: client prompt return on context cancellation #1729

1.22.0 / 2025-04-07

:warning: This release contains potential breaking change if you use experimental zstd support introduce in #1496 :warning:

Experimental support for zstd on scrape was added, controlled by the request Accept-Encoding header. It was enabled by default since version 1.20, but now you need to add a blank import to enable it. The decision to make it opt-in by default was originally made because the Go standard library was expected to have default zstd support added soon, golang/go#62513 however, the work took longer than anticipated and it will be postponed to upcoming major Go versions.

e.g.:

import (
  _ "github.com/prometheus/client_golang/prometheus/promhttp/zstd"
)

• [FEATURE] prometheus: Add new CollectorFunc utility #1724
• [CHANGE] Minimum required Go version is now 1.22 (we also test client_golang against latest go version - 1.24) #1738
• [FEATURE] api: WithLookbackDelta and WithStats options have been added to API client. #1743
• [CHANGE] :warning: promhttp: Isolate zstd support and klauspost/compress library use to promhttp/zstd package. #1765

1.21.1 / 2025-03-04

• [BUGFIX] prometheus: Revert of Inc, Add and Observe cumulative metric CAS optimizations (#1661), causing regressions on low contention cases.
• [BUGFIX] prometheus: Fix GOOS=ios build, broken due to process_collector_* wrong build tags.

1.21.0 / 2025-02-17

:warning: This release contains potential breaking change if you upgrade github.com/prometheus/common to 0.62+ together with client_golang. :warning:

New common version changes model.NameValidationScheme global variable, which relaxes the validation of label names and metric name, allowing all UTF-8 characters. Typically, this should not break any user, unless your test or usage expects strict certain names to panic/fail on client_golang metric registration, gathering or scrape. In case of problems change model.NameValidationScheme to old model.LegacyValidation value in your project init function.

• [BUGFIX] gocollector: Fix help message for runtime/metric metrics. #1583
• [BUGFIX] prometheus: Fix Desc.String() method for no labels case. #1687
• [ENHANCEMENT] prometheus: Optimize popular prometheus.BuildFQName function; now up to 30% faster. #1665

... (truncated)

• 4ff40f0 Cut v1.23.1 (#1867)
• 989b029 Upgrade to prometheus/common v0.66 (#1866)
• e4b2208 Cut v1.23.0 (#1848)
• d9492af cut v1.23.0-rc.1 (#1842)
• aeae8a0 Cut v1.23.0-rc.0 (#1837)
• b157309 Update common Prometheus files (#1832)
• a704e28 build(deps): bump the github-actions group with 3 updates (#1826)
• c774311 Fix errNotImplemented reference (#1835)
• db4db7b Update runtime metrics for Go v1.23 and v1.24 (#1833)
• 99d380e Update common Prometheus files (#1831)
• Additional commits viewable in compare view

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