: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](https://github.com/prometheus/common/pull/724), 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

* [ENHANCEMENT] prometheus: Optimize `Inc`, `Add` and `Observe` cumulative metrics; now up to 50% faster under high concurrent contention. #1661

* [CHANGE] Upgrade prometheus/common to 0.62.0 which changes `model.NameValidationScheme` global variable. #1712

* [CHANGE] Add support for Go 1.23. #1602

* [FEATURE] process_collector: Add support for Darwin systems. #1600 #1616 #1625 #1675 #1715

* [FEATURE] api: Add ability to invoke `CloseIdleConnections` on api.Client using `api.Client.(CloseIdler).CloseIdleConnections()` casting. #1513

* [FEATURE] promhttp: Add `promhttp.HandlerOpts.EnableOpenMetricsTextCreatedSamples` option to create OpenMetrics _created lines. Not recommended unless you want to use opt-in Created Timestamp feature. Community works on OpenMetrics 2.0 format that should make those lines obsolete (they increase cardinality significantly). #1408

* [FEATURE] prometheus: Add `NewConstNativeHistogram` function. #1654

1.21.0-rc.0