Update module github.com/prometheus/client_golang to v1.21.1

This MR contains the following updates:

Package	Type	Update	Change
github.com/prometheus/client_golang	require	minor	v1.20.3 -> v1.21.1

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Release Notes

prometheus/client_golang (github.com/prometheus/client_golang)

v1.21.1: / 2025-03-04

Compare Source

This release addresses a performance regression introduced in #​1661 -- thanks to all who reported this quickly: @​chlunde, @​dethi, @​aaronbee @​tsuna @​kakkoyun . This patch release also fixes the iOS build.

We will be hardening the release process even further (#​1759, #​1761) to prevent this in future, sorry for the inconvenience!

The high concurrency optimization is planned to be eventually reintroduced, however in a much safer manner, potentially in a separate API.

• [BUGFIX] prometheus: Revert of Inc, Add and Observe cumulative metric CAS optimizations (#​1661), causing regressions on low concurrency cases #​1757
• [BUGFIX] prometheus: Fix GOOS=ios build, broken due to process_collector_* wrong build tags. #​1758

All commits

• Revert "exponential backoff for CAS operations on floats" and cut 1.21.1 by @​bwplotka in https://github.com/prometheus/client_golang/pull/1757
• Fix ios build for 1.21.1 by @​bwplotka in https://github.com/prometheus/client_golang/pull/1758

Full Changelog: https://github.com/prometheus/client_golang/compare/v1.21.0...v1.21.1

v1.21.0: / 2025-02-19

Compare Source

This release contains potential breaking change if you upgrade github.com/prometheus/common to 0.62+ together with client_golang (and depend on the strict, legacy validation for the label names). 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
• [PERF] prometheus: Optimize popular prometheus.BuildFQName function; now up to 30% faster. #​1665
• [PERF] 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

All commits

* Merge release-1.20 to main by @​bwplotka in https://github.com/prometheus/client_golang/pull/1582 * gocollector: Tiny fix for help message with runtime/metrics source. by @​bwplotka in https://github.com/prometheus/client_golang/pull/1583 * ci: bump dagger to the latest version by @​marcosnils in https://github.com/prometheus/client_golang/pull/1588 * Merge release-1.20 back to main by @​ArthurSens in https://github.com/prometheus/client_golang/pull/1593 * Update linting by @​SuperQ in https://github.com/prometheus/client_golang/pull/1603 * Update supported Go versions by @​SuperQ in https://github.com/prometheus/client_golang/pull/1602 * build(deps): bump golang.org/x/sys from 0.22.0 to 0.24.0 by @​dependabot in https://github.com/prometheus/client_golang/pull/1611 * build(deps): bump github.com/prometheus/common from 0.55.0 to 0.57.0 by @​dependabot in https://github.com/prometheus/client_golang/pull/1612 * changed the name of all variables with min/max name by @​parthlaw in https://github.com/prometheus/client_golang/pull/1606 * Update Dagger and build. by @​SuperQ in https://github.com/prometheus/client_golang/pull/1610 * build(deps): bump github/codeql-action from 3.25.15 to 3.26.6 in the github-actions group across 1 directory by @​dependabot in https://github.com/prometheus/client_golang/pull/1614 * examples: Improved GoCollector example. by @​bwplotka in https://github.com/prometheus/client_golang/pull/1589 * Synchronize common files from prometheus/prometheus by @​prombot in https://github.com/prometheus/client_golang/pull/1615 * process_collector: fill in most statistics on macOS by @​mharbison72 in https://github.com/prometheus/client_golang/pull/1600 * http client defer CloseIdleConnections by @​cuisongliu in https://github.com/prometheus/client_golang/pull/1513 * Set allow-utf-8 in Format during tests to avoid escaping. by @​ywwg in https://github.com/prometheus/client_golang/pull/1618 * Synchronize common files from prometheus/prometheus by @​prombot in https://github.com/prometheus/client_golang/pull/1622 * Merge Release 1.20 back to main by @​ArthurSens in https://github.com/prometheus/client_golang/pull/1627 * examples: Add custom labels example by @​ying-jeanne in https://github.com/prometheus/client_golang/pull/1626 * Refactor default runtime metrics tests for Go collector so that default runtime metric set autogenerates by @​vesari in https://github.com/prometheus/client_golang/pull/1631 * Synchronize common files from prometheus/prometheus by @​prombot in https://github.com/prometheus/client_golang/pull/1628 * process_xxx_memory statistics for macOS (cgo) by @​mharbison72 in https://github.com/prometheus/client_golang/pull/1616 * build(deps): bump github.com/klauspost/compress from 1.17.9 to 1.17.10 by @​dependabot in https://github.com/prometheus/client_golang/pull/1633 * build(deps): bump golang.org/x/sys from 0.24.0 to 0.25.0 by @​dependabot in https://github.com/prometheus/client_golang/pull/1632 * process_collector: Add Platform-Specific Describe for processCollector by @​ying-jeanne in https://github.com/prometheus/client_golang/pull/1625 * Synchronize common files from prometheus/prometheus by @​prombot in https://github.com/prometheus/client_golang/pull/1635 * build(deps): bump the github-actions group with 4 updates by @​dependabot in https://github.com/prometheus/client_golang/pull/1634 * Optionally print OM created lines by @​ArthurSens in https://github.com/prometheus/client_golang/pull/1408 * process_collector: merge wasip1 and js into a single implementation by @​ying-jeanne in https://github.com/prometheus/client_golang/pull/1644 * Merge release 1.20 to main by @​bwplotka in https://github.com/prometheus/client_golang/pull/1647 * Add Arianna as maintainer by @​ArthurSens in https://github.com/prometheus/client_golang/pull/1651 * test add headers round tripper by @​Manask322 in https://github.com/prometheus/client_golang/pull/1657 * build(deps): bump github.com/klauspost/compress from 1.17.10 to 1.17.11 by @​dependabot in https://github.com/prometheus/client_golang/pull/1668 * build(deps): bump golang.org/x/sys from 0.25.0 to 0.26.0 by @​dependabot in https://github.com/prometheus/client_golang/pull/1669 * build(deps): bump github.com/prometheus/common from 0.59.1 to 0.60.1 by @​dependabot in https://github.com/prometheus/client_golang/pull/1667 * build(deps): bump google.golang.org/protobuf from 1.34.2 to 1.35.1 by @​dependabot in https://github.com/prometheus/client_golang/pull/1670 * Optimize BuildFQName function by @​jkroepke in https://github.com/prometheus/client_golang/pull/1665 * fix: use injected now() instead of time.Now() in summary methods by @​imorph in https://github.com/prometheus/client_golang/pull/1672 * process_collector: avoid a compiler warning on macOS (fixes #​1660) by @​mharbison72 in https://github.com/prometheus/client_golang/pull/1675 * Synchronize common files from prometheus/prometheus by @​prombot in https://github.com/prometheus/client_golang/pull/1674 * build(deps): bump the github-actions group across 1 directory with 3 updates by @​dependabot in https://github.com/prometheus/client_golang/pull/1678 * [chore]: enable perfsprint linter by @​mmorel-35 in https://github.com/prometheus/client_golang/pull/1676 * Duplicate of #​1662 by @​imorph in https://github.com/prometheus/client_golang/pull/1673 * Synchronize common files from prometheus/prometheus by @​prombot in https://github.com/prometheus/client_golang/pull/1679 * chore: enable usestdlibvars linter by @​mmorel-35 in https://github.com/prometheus/client_golang/pull/1680 * Add: exponential backoff for CAS operations on floats by @​imorph in https://github.com/prometheus/client_golang/pull/1661 * Synchronize common files from prometheus/prometheus by @​prombot in https://github.com/prometheus/client_golang/pull/1683 * [1617] Add ConstnativeHistogram by @​shivanthzen in https://github.com/prometheus/client_golang/pull/1654 * fix: replace fmt.Errorf with errors.New by @​kakkoyun in https://github.com/prometheus/client_golang/pull/1689 * Add codeowners by @​kakkoyun in https://github.com/prometheus/client_golang/pull/1688 * fix: add very small delay between observations in `TestHistogramAtomicObserve` by @​imorph in https://github.com/prometheus/client_golang/pull/1691 * Synchronize common files from prometheus/prometheus by @​prombot in https://github.com/prometheus/client_golang/pull/1692 * Fix: handle nil variableLabels in Desc.String() method and add tests for nil label values by @​kakkoyun in https://github.com/prometheus/client_golang/pull/1687 * examples: Follow best practices and established naming conventions by @​lilic in https://github.com/prometheus/client_golang/pull/1650 * setup OSSF Scorecard workflow by @​mmorel-35 in https://github.com/prometheus/client_golang/pull/1432 * build(deps): bump google.golang.org/protobuf from 1.35.1 to 1.35.2 by @​dependabot in https://github.com/prometheus/client_golang/pull/1697 * build(deps): bump golang.org/x/sys from 0.26.0 to 0.27.0 by @​dependabot in https://github.com/prometheus/client_golang/pull/1696 * build(deps): bump the github-actions group with 5 updates by @​dependabot in https://github.com/prometheus/client_golang/pull/1695 * update links to openmetrics to reference the v1.0.0 release by @​dashpole in https://github.com/prometheus/client_golang/pull/1699 * build(deps): bump google.golang.org/protobuf from 1.35.2 to 1.36.1 by @​dependabot in https://github.com/prometheus/client_golang/pull/1706 * build(deps): bump golang.org/x/sys from 0.27.0 to 0.28.0 by @​dependabot in https://github.com/prometheus/client_golang/pull/1705 * build(deps): bump the github-actions group with 5 updates by @​dependabot in https://github.com/prometheus/client_golang/pull/1707 * build(deps): bump github.com/prometheus/common from 0.60.1 to 0.61.0 by @​dependabot in https://github.com/prometheus/client_golang/pull/1704 * Synchronize common files from prometheus/prometheus by @​prombot in https://github.com/prometheus/client_golang/pull/1703 * Synchronize common files from prometheus/prometheus by @​prombot in https://github.com/prometheus/client_golang/pull/1708 * Upgrade to prometheus/common 0.62.0 with breaking change by @​bwplotka in https://github.com/prometheus/client_golang/pull/1712 * build(deps): bump golang.org/x/net from 0.26.0 to 0.33.0 in /tutorials/whatsup by @​dependabot in https://github.com/prometheus/client_golang/pull/1713 * docs: Add RELEASE.md for the release process by @​kakkoyun in https://github.com/prometheus/client_golang/pull/1690 * tutorials/whatsup: Updated deps by @​bwplotka in https://github.com/prometheus/client_golang/pull/1716 * process collector: Fixed pedantic registry failures on darwin with cgo. by @​bwplotka in https://github.com/prometheus/client_golang/pull/1715 * Revert "ci: daggerize test and lint pipelines (#​1534)" by @​bwplotka in https://github.com/prometheus/client_golang/pull/1717 * Cut 1.21.0-rc.0 by @​bwplotka in https://github.com/prometheus/client_golang/pull/1718 * Cut 1.21 by @​bwplotka in https://github.com/prometheus/client_golang/pull/1737

New Contributors

• @​parthlaw made their first contribution in https://github.com/prometheus/client_golang/pull/1606
• @​mharbison72 made their first contribution in https://github.com/prometheus/client_golang/pull/1600
• @​cuisongliu made their first contribution in https://github.com/prometheus/client_golang/pull/1513
• @​ying-jeanne made their first contribution in https://github.com/prometheus/client_golang/pull/1626
• @​Manask322 made their first contribution in https://github.com/prometheus/client_golang/pull/1657
• @​jkroepke made their first contribution in https://github.com/prometheus/client_golang/pull/1665
• @​imorph made their first contribution in https://github.com/prometheus/client_golang/pull/1672
• @​mmorel-35 made their first contribution in https://github.com/prometheus/client_golang/pull/1676
• @​shivanthzen made their first contribution in https://github.com/prometheus/client_golang/pull/1654
• @​dashpole made their first contribution in https://github.com/prometheus/client_golang/pull/1699

Full Changelog: https://github.com/prometheus/client_golang/compare/v1.20.5...v1.21.0

v1.20.5: / 2024-10-15

Compare Source

We decided to revert the testutil change that made our util functions less error-prone, but created a lot of work for our downstream users. Apologies for the pain! This revert should not cause any major breaking change, even if you already did the work--unless you depend on the exact error message.

Going forward, we plan to reinforce our release testing strategy [1],[2] and deliver an enhanced testutil package/module with more flexible and safer APIs.

Thanks to @​dashpole @​dgrisonnet @​kakkoyun @​ArthurSens @​vesari @​logicalhan @​krajorama @​bwplotka who helped in this patch release!

Changelog

[BUGFIX] testutil: Reverted #​1424; functions using compareMetricFamilies are (again) only failing if filtered metricNames are in the expected input. #​1645

v1.20.4

Compare Source

• [BUGFIX] histograms: Fix a possible data race when appending exemplars vs metrics gather. #​1623

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