:warning: This release raises the minimum required Go version to 1.26 and includes breaking API changes in api/prometheus/v1 (see the [CHANGE] entries below). :warning:
1.25.0-rc.0 / 2026-10-05
- [CHANGE] Minimum required Go version is now 1.26, only the two latest Go versions (1.26 and 1.27) are supported from now on. #2138
- [CHANGE] api/prometheus/v1:
Query,QueryRange,Series,LabelNames, andLabelValuesnow returnInfosannotations in addition toWarnings, matching the Prometheus server's info annotations. This changes the signatures of these methods and ofapi.Client'sDo/DoGetFallback; custom API client implementations must be updated. #1963 - [CHANGE] api/prometheus/v1: Rework
TSDBBlocksresult types to align with the Prometheus server'stsdb.BlockMeta:TSDBBlocksResultnow containsBlocks []TSDBBlockMetadirectly instead of mirroring the full API envelope, nested types are renamed (TSDBBlockMeta,TSDBBlockStats,TSDBBlockMetaCompaction), stat fields areuint64withomitemptytags, and the optional compactionparentsfield is included. #1928 - [FEATURE] testutil: Add
GatherAndFormatto encode a subset of metrics from a Gatherer. #2091 - [FEATURE] promhttp: Add
HandlerOpts.AcceptedFormatsto customize the formats negotiated from the incomingAcceptheader, enabling opt-in to experimental formats such as OpenMetrics 2.0 without changing default negotiation. #2146 - [ENHANCEMENT] promhttp: Negotiated metrics responses now include a
Varyheader. #2142 - [ENHANCEMENT] prometheus: Regenerate the default runtime collector metrics for Go 1.25 and Go 1.26. #2090, #2095
- [ENHANCEMENT] testutil: Finalize OpenMetrics output in
GatherAndFormatandCollectAndFormat(terminating# EOF). #2125 - [BUGFIX] api: Match complete URL path placeholders only; a
:fooargument no longer substitutes inside:foobar. #2136 - [BUGFIX] exp/api/remote: Reset the pooled buffer before generic proto marshaling, preventing corrupted remote-write payloads. #2139
- [BUGFIX] testutil/promlint: Fix "mibi" unit prefix to "mebi". #2135
What's changed
What's Changed
- fix: Remove unneeded and broken CI badge by @bwplotka in https://github.com/prometheus/client_golang/pull/2057
- Synchronize common files from prometheus/prometheus by @prombot in https://github.com/prometheus/client_golang/pull/2060
- build(deps): bump the codeql group with 4 updates by @dependabot[bot] in https://github.com/prometheus/client_golang/pull/2066
- build(deps): bump github.com/klauspost/compress from 1.19.0 to 1.19.1 by @dependabot[bot] in https://github.com/prometheus/client_golang/pull/2071
- build(deps): bump golang.org/x/sys from 0.46.0 to 0.47.0 in the golang-org-x group across 1 directory by @dependabot[bot] in https://github.com/prometheus/client_golang/pull/2069
- build(deps): bump github.com/klauspost/compress from 1.19.0 to 1.19.1 in /exp by @dependabot[bot] in https://github.com/prometheus/client_golang/pull/2072
- build(deps): bump github.com/prometheus/common from 0.69.0 to 0.70.1 in /exp by @dependabot[bot] in https://github.com/prometheus/client_golang/pull/2073
- build(deps): bump github.com/prometheus/common from 0.69.0 to 0.70.1 by @dependabot[bot] in https://github.com/prometheus/client_golang/pull/2070
- build(deps): bump google.golang.org/grpc from 1.79.3 to 1.82.1 in /tutorials/whatsup by @dependabot[bot] in https://github.com/prometheus/client_golang/pull/2075
- Pin GitHub Actions by @SuperQ in https://github.com/prometheus/client_golang/pull/2074
- build(deps): bump actions/checkout from 7.0.0 to 7.0.1 by @dependabot[bot] in https://github.com/prometheus/client_golang/pull/2067
- promhttp: fix panic on requests with nil URL by @SAY-5 in https://github.com/prometheus/client_golang/pull/2065
- Return info annotations in addition to warnings in the API by @zenador in https://github.com/prometheus/client_golang/pull/1963
- build(deps): bump ossf/scorecard-action from 2.4.3 to 2.4.4 by @dependabot[bot] in https://github.com/prometheus/client_golang/pull/2082
- Synchronize common files from prometheus/prometheus by @prombot in https://github.com/prometheus/client_golang/pull/2084
- Synchronize common files from prometheus/prometheus by @prombot in https://github.com/prometheus/client_golang/pull/2086
- Synchronize common files from prometheus/prometheus by @prombot in https://github.com/prometheus/client_golang/pull/2088
- Regenerate Go collector runtime metrics for Go 1.25 and Go 1.26 by @bwplotka in https://github.com/prometheus/client_golang/pull/2090
- go.mod: remove obsolete exclude rule by @thaJeztah in https://github.com/prometheus/client_golang/pull/2077
- Synchronize common files from prometheus/prometheus by @prombot in https://github.com/prometheus/client_golang/pull/2093
- README: document the OpenTelemetry OTLP push bridge by @mvanhorn in https://github.com/prometheus/client_golang/pull/1987
- docs: add AGENTS.md contributor and maintainer guide by @bwplotka in https://github.com/prometheus/client_golang/pull/2056
- testutil: add GatherAndFormat helper by @wieghx in https://github.com/prometheus/client_golang/pull/2091
- build(deps): bump the codeql group with 4 updates by @dependabot[bot] in https://github.com/prometheus/client_golang/pull/2101
- build(deps): bump google.golang.org/protobuf from 1.36.11 to 1.36.12 by @dependabot[bot] in https://github.com/prometheus/client_golang/pull/2097
- build(deps): bump github.com/klauspost/compress from 1.19.1 to 1.19.2 by @dependabot[bot] in https://github.com/prometheus/client_golang/pull/2098
- build(deps): bump google.golang.org/protobuf from 1.36.11 to 1.36.12 in /exp by @dependabot[bot] in https://github.com/prometheus/client_golang/pull/2099
- build(deps): bump github.com/klauspost/compress from 1.19.1 to 1.19.2 in /exp by @dependabot[bot] in https://github.com/prometheus/client_golang/pull/2100
- build(deps): bump github.com/prometheus/procfs from 0.21.1 to 0.22.0 in the prometheus group across 1 directory by @dependabot[bot] in https://github.com/prometheus/client_golang/pull/2096
- build(deps): bump google.golang.org/grpc from 1.82.1 to 1.83.1 in /tutorials/whatsup by @dependabot[bot] in https://github.com/prometheus/client_golang/pull/2102
- chore: Update metrics for new Go version by @github-actions[bot] in https://github.com/prometheus/client_golang/pull/2095
- Benchmark json-iter, stdlib json and json/v2 by @liggitt in https://github.com/prometheus/client_golang/pull/2107
- build(deps): bump google.golang.org/grpc from 1.83.1 to 1.83.2 in /tutorials/whatsup by @dependabot[bot] in https://github.com/prometheus/client_golang/pull/2112
- RuleGroup: use stdlib for json decoding, optimize decoding by @liggitt in https://github.com/prometheus/client_golang/pull/2109
- Modernize micro benchmarks: b.Loop and key=value case names by @radianceded in https://github.com/prometheus/client_golang/pull/2114
- QueryResult: use stdlib for envelope decoding by @liggitt in https://github.com/prometheus/client_golang/pull/2110
- Use stdlib to decode apiResult envelope by @liggitt in https://github.com/prometheus/client_golang/pull/2111
- Improve linting by @SuperQ in https://github.com/prometheus/client_golang/pull/2115
- Delete unused custom json-iterator marshaling by @liggitt in https://github.com/prometheus/client_golang/pull/2121
- Simplify apiClientImpl#Do error path by @liggitt in https://github.com/prometheus/client_golang/pull/2120
- testutil: finalize OpenMetrics output by @ajavanma in https://github.com/prometheus/client_golang/pull/2125
- build(deps): bump go.opentelemetry.io/otel/sdk from 1.44.0 to 1.45.0 in /tutorials/whatsup by @dependabot[bot] in https://github.com/prometheus/client_golang/pull/2124
- Synchronize common files from prometheus/prometheus by @prombot in https://github.com/prometheus/client_golang/pull/2116
- prometheus: fix revive indent-error-flow lint on Darwin by @bwplotka in https://github.com/prometheus/client_golang/pull/2131
- build(deps): bump go.opentelemetry.io/otel/exporters/otlp/otlptrace from 1.34.0 to 1.45.0 in /tutorials/whatsup by @dependabot[bot] in https://github.com/prometheus/client_golang/pull/2123
- Combine envelope/inner apiResponse decoding, switch to stdlib json by @liggitt in https://github.com/prometheus/client_golang/pull/2118
- build(deps): bump go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc from 1.34.0 to 1.45.0 in /tutorials/whatsup by @dependabot[bot] in https://github.com/prometheus/client_golang/pull/2122
- testutil/promlint: fix "mibi" unit prefix to "mebi" by @ZainnQureshii in https://github.com/prometheus/client_golang/pull/2135
- all: update prometheus/common to v0.72.0 and apply modernize fixes by @bwplotka in https://github.com/prometheus/client_golang/pull/2138
- limit json-iterator use to Go 1.26 by @liggitt in https://github.com/prometheus/client_golang/pull/2128
- promhttp: add AcceptedFormats option to customize format negotiation by @bwplotka in https://github.com/prometheus/client_golang/pull/2146
- build(deps): bump github.com/klauspost/compress from 1.19.2 to 1.20.1 by @dependabot[bot] in https://github.com/prometheus/client_golang/pull/2143
- build(deps): bump the codeql group with 4 updates by @dependabot[bot] in https://github.com/prometheus/client_golang/pull/2145
- build(deps): bump github.com/klauspost/compress from 1.19.2 to 1.20.1 in /exp by @dependabot[bot] in https://github.com/prometheus/client_golang/pull/2144
- promhttp: vary negotiated metrics responses by @lowgame in https://github.com/prometheus/client_golang/pull/2142
- exp/api/remote: reset pooled buffer before generic marshal by @lowgame in https://github.com/prometheus/client_golang/pull/2139
- api: match complete URL placeholders by @lowgame in https://github.com/prometheus/client_golang/pull/2136
- fix: updates for tsdb blocks handling by @tjhop in https://github.com/prometheus/client_golang/pull/1928
- prometheus: fix modernize lint findings by @kakkoyun in https://github.com/prometheus/client_golang/pull/2151
- build(deps): bump google.golang.org/grpc from 1.82.1 to 1.83.2 in /api/prometheus/v1/paritytest by @dependabot[bot] in https://github.com/prometheus/client_golang/pull/2152
- Cut v1.25.0-rc.0 by @kakkoyun in https://github.com/prometheus/client_golang/pull/2154
New Contributors
- @SAY-5 made their first contribution in https://github.com/prometheus/client_golang/pull/2065
- @zenador made their first contribution in https://github.com/prometheus/client_golang/pull/1963
- @thaJeztah made their first contribution in https://github.com/prometheus/client_golang/pull/2077
- @mvanhorn made their first contribution in https://github.com/prometheus/client_golang/pull/1987
- @wieghx made their first contribution in https://github.com/prometheus/client_golang/pull/2091
- @radianceded made their first contribution in https://github.com/prometheus/client_golang/pull/2114
- @ajavanma made their first contribution in https://github.com/prometheus/client_golang/pull/2125
- @ZainnQureshii made their first contribution in https://github.com/prometheus/client_golang/pull/2135
- @lowgame made their first contribution in https://github.com/prometheus/client_golang/pull/2142
Full Changelog: https://github.com/prometheus/client_golang/compare/v1.24.1...v1.25.0-rc.0