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fix: Tighten OM2 summary and start timestamp output - #2041

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jaydeluca merged 1 commit into
prometheus:mainfrom
zeitlinger:codex/om2-strict-conformance
Apr 23, 2026
Merged

fix: Tighten OM2 summary and start timestamp output#2041
jaydeluca merged 1 commit into
prometheus:mainfrom
zeitlinger:codex/om2-strict-conformance

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@zeitlinger zeitlinger commented Apr 23, 2026

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Summary

Tighten the OpenMetrics 2.0 text writer for non-histogram conformance details:

  • emit counter start timestamps inline with st@ instead of a separate _created sample
  • always include the quantile composite field for OM2 summaries, including quantile:[]
  • emit all summary exemplars attached to the composite summary sample

Context

These are follow-up OM2 conformance fixes separate from native histogram serialization. The existing content negotiation and content-type feature flag behavior is intentionally unchanged.

Validation

  • ./mvnw test -pl prometheus-metrics-exposition-textformats -Dtest=OpenMetrics2TextFormatWriterTest,ExpositionFormatsTest -Dcoverage.skip=true -Dcheckstyle.skip=true
  • mise run build
@zeitlinger
Tighten OM2 summary and start timestamp output
e4dcdc7 
Signed-off-by: Gregor Zeitlinger <gregor.zeitlinger@grafana.com>
@zeitlinger zeitlinger changed the title [codex] Tighten OM2 summary and start timestamp output Apr 23, 2026
@zeitlinger
zeitlinger marked this pull request as ready for review April 23, 2026 08:57
@jaydeluca
jaydeluca merged commit 5699469 into prometheus:main Apr 23, 2026
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@github-actions github-actions Bot mentioned this pull request Apr 23, 2026
Merged
zeitlinger pushed a commit that referenced this pull request Apr 27, 2026
@github-actions
chore(main): release 1.6.0 (#1983)
a1530df 
🤖 I have created a release *beep* *boop*
---


##
[1.6.0](v1.5.1...v1.6.0)
(2026-04-25)


### Features

* Add logic for handling content negotation flag with OM2
([#1986](#1986))
([0fa1ad7](0fa1ad7))
* Add OM2 native histogram text output
([#2042](#2042))
([dec8e5b](dec8e5b))
* add OTel preserve_names for scrape-time suffix handling
([#1956](#1956))
([f794288](f794288))
* compositeValues and exemplarCompliance flags for OM2 writer
([#1991](#1991))
([ff48ae8](ff48ae8))
* move suffix handling to scrape time
([#1955](#1955))
([5a5106c](5a5106c))
* OM2 writer outputs names as provided, no suffix appending
([#1957](#1957))
([5ce2b57](5ce2b57))


### Bug Fixes

* **deps:** update dependency com.google.guava:guava to v33.6.0-jre
([#2021](#2021))
([1382693](1382693))
* **deps:** update dependency commons-io:commons-io to v2.22.0
([#2044](#2044))
([9e05c1d](9e05c1d))
* **deps:** update dependency
io.opentelemetry.instrumentation:opentelemetry-instrumentation-bom-alpha
to v2.27.0-alpha
([#2022](#2022))
([30ac534](30ac534))
* **deps:** update dependency
io.opentelemetry.instrumentation:opentelemetry-instrumentation-bom-alpha
to v2.27.0-alpha
([#2023](#2023))
([2d51a32](2d51a32))
* **deps:** update dependency io.prometheus:prometheus-metrics-bom to
v1.5.1 ([#2004](#2004))
([650ce4b](650ce4b))
* **deps:** update dependency org.apache.tomcat.embed:tomcat-embed-core
to v11.0.21
([#2005](#2005))
([7a36df7](7a36df7))
* **deps:** update dependency
org.springframework.boot:spring-boot-starter-parent to v4.0.5
([#2006](#2006))
([0106c18](0106c18))
* **deps:** update dependency
org.springframework.boot:spring-boot-starter-parent to v4.0.6
([#2046](#2046))
([40a9db8](40a9db8))
* **deps:** update jetty monorepo to v12.1.8
([#2007](#2007))
([acab5b2](acab5b2))
* **deps:** update protobuf
([#2024](#2024))
([8e2214e](8e2214e))
* pass release tag as input to deploy workflow
([#1982](#1982))
([165c921](165c921))
* pin grafana/otel-lgtm to 0.7.2 in OATs acceptance test
([#1992](#1992))
([f17ad9a](f17ad9a))
* Relax metric name validation in Dropwizard5
([#1985](#1985))
([deb782f](deb782f))
* stabilize flaky timer and thread count tests
([#1973](#1973))
([ce5867b](ce5867b))
* Tighten OM2 summary and start timestamp output
([#2041](#2041))
([5699469](5699469))
* trigger Maven deploy from release-please via workflow_dispatch
([#1981](#1981))
([698f956](698f956))

---
> [!IMPORTANT]
> Close and reopen this PR to trigger CI checks.

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
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