v1.22.0 - 2025-04-07

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

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The decision to make it opt-in by default was originally made because the Go standard library was expected to have default zstd support added soon,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] ⚠️ promhttp: Isolate zstd support and klauspost/compress library use to promhttp/zstd package. #1765

All Changes

• build(deps): bump golang.org/x/sys from 0.28.0 to 0.29.0 by @dependabot in #1720
• build(deps): bump google.golang.org/protobuf from 1.36.1 to 1.36.3 by @dependabot in #1719
• Update RELEASE.md by @bwplotka in #1721
• chore(docs): Add links for the upstream PRs by @kakkoyun in #1722
• Added tips on releasing client and checking with k8s. by @bwplotka in #1723
• feat: Add new CollectorFunc utility by @Saumya40-codes in #1724
• build(deps): bump google.golang.org/protobuf from 1.36.3 to 1.36.4 by @dependabot in #1725
• build(deps): bump the github-actions group with 5 updates by @dependabot in #1726
• Synchronize common files from prometheus/prometheus by @prombot in #1727
• Synchronize common files from prometheus/prometheus by @prombot in #1731
• build(deps): bump golang.org/x/sys from 0.29.0 to 0.30.0 by @dependabot in #1739
• build(deps): bump google.golang.org/protobuf from 1.36.4 to 1.36.5 by @dependabot in #1740
• Cleanup dependabot config by @SuperQ in #1741
• Upgrade Golang version v1.24 by @dongjiang1989 in #1738
• build(deps): bump the github-actions group with 2 updates by @dependabot in #1742
• Merging 1.21 release back to main. by @bwplotka in #1744
• Synchronize common files from prometheus/prometheus by @prombot in #1745
• Add support for undocumented query options for API by @mahendrapaipuri in #1743
• exp/api: Add experimental exp module; Add remote API with write client and handler. by @bwplotka in #1658
• exp/api: Add accepted msg type validation to handler by @saswatamcode in #1750
• build(deps): bump the github-actions group with 5 updates by @dependabot in #1751
• build(deps): bump github.com/klauspost/compress from 1.17.11 to 1.18.0 by @dependabot in #1752
• build(deps): bump github.com/google/go-cmp from 0.6.0 to 0.7.0 by @dependabot in #1753
• exp: Reset snappy buf by @saswatamcode in #1756
• Merge release 1.21.1 to main. by @bwplotka in #1762
• exp: Add dependabot config by @saswatamcode in #1754
• build(deps): bump peter-evans/create-pull-request from 7.0.7 to 7.0.8 in the github-actions group by @dependabot in #1764
• promhttp: Isolate zstd support and klauspost/compress library use to promhttp/zstd package by @liggitt in #1765
• Cut 1.22.0-rc.0 by @kakkoyun in #1768

New Contributors

• @Saumya40-codes made their first contribution in #1724
• @mahendrapaipuri made their first contribution in #1743
• @liggitt made their first contribution in #1765

Full Changelog: v1.21.1...v1.22.0-rc.0