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Release 1.56#5029

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carlosalberto merged 6 commits intoopen-telemetry:mainfrom
carlosalberto:release-1-56
Apr 20, 2026
Merged

Release 1.56#5029
carlosalberto merged 6 commits intoopen-telemetry:mainfrom
carlosalberto:release-1-56

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@carlosalberto carlosalberto commented Apr 15, 2026 •
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Context

  • Align environment variable context propagation name restrictions with POSIX.1-2024
    and define normalization behavior.
    (#4944)
  • Decouple the responsibilities of the environment variable propagation carrier.
    (#4961)
  • Remove misleading implementation approach the environment variable propagation.
    (#5003)
  • Change Environment Variables as Context Propagation Carriers document status to Beta.
    (#5020)

Traces

  • Stabilize Tracer enabled operation
    (#4941)
  • Stabilize AlwaysRecord sampler.
    (#4934)

Metrics

  • Add development maxExportBatchSize parameter to Periodic exporting MetricReader.
    (#4895)

Logs

  • Add event to span event bridge.
    (#5006)

Resource

  • Clarify that a Resource describes the observed entity, not the component
    that technically emits telemetry.
    (#4905)

Compatibility

  • Deprecate OpenTracing compatibility requirements in the specification.
    (#4938)
  • Stabilize sections of Prometheus and OpenMetrics Compatibility.
    • Stabilize Prometheus Classic Histogram to OTLP Explicit Histogram transformation.
      (#4874)
    • Stabilize Prometheus Timestamp and Start timestamp transformation.
      (#4953)
    • Clarify Prometheus Native Histogram to OTLP Exponential Histogram conversion,
      add conversion rules for Native Histograms with Custom Buckets (NHCB) to OTLP
      Histogram.
      (#4898)
    • Stabilize Prometheus Dropped Types transformation.
      (#4952)
    • Stabilize OpenTelemetry Attributes to Prometheus labels transformation.
      (#4963)
    • Stabilize Prometheus Exemplar to OpenTelemetry Exemplar transformation.
      (#4962)
    • Stabilize Prometheus Metadata transformation.
      (#4954)
    • Stabilize OpenTelemetry Metric Metadata to Prometheus metric metadata.
      (#4966)
    • Stabilize OpenTelemetry Exemplar to Prometheus Exemplar transformation.
      (#4964)
  • Stabilize sections of Prometheus Metrics Exporter.
    • Stabilize host configuration.
      (#5025)

SDK Configuration

  • Declarative configuration: add in-development guidance for exposing the
    effective Resource returned by Create.
    (#4949)
  • Require spec changes to consider declarative config schema
    (#4916)
  • Add strict YAML parsing guidance to configuration supplementary guidelines.
    (#4878)

OTEPs

  • Process Context: Sharing Resource Attributes with External Readers.
    (#4719)
  • Support multiple Resources within an SDK.
    (#4665)

@carlosalberto carlosalberto requested review from a team as code owners April 15, 2026 23:40
@carlosalberto carlosalberto changed the title Release 1 56 Release 1.56 Apr 15, 2026
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carlosalberto commented Apr 15, 2026

cc @bogdandrutu

pellared
pellared approved these changes Apr 16, 2026
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We could potentially merge #5020 to have all charges related to env vars carrier in a single release

jack-berg
jack-berg reviewed Apr 16, 2026
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Comment thread CHANGELOG.md Outdated
@carlosalberto @jack-berg
Update CHANGELOG.md
9974d62 
Co-authored-by: Jack Berg <34418638+jack-berg@users.noreply.github.com>
@carlosalberto carlosalberto added this pull request to the merge queue Apr 20, 2026
Merged via the queue into open-telemetry:main with commit 50149c2 Apr 20, 2026
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@carlosalberto carlosalberto deleted the release-1-56 branch April 20, 2026 16:43
hilmarf pushed a commit to apeirora/opentelemetry-specification that referenced this pull request Apr 22, 2026
@carlosalberto @jack-berg @hilmarf
Release 1.56 (open-telemetry#5029)
68fba8a 
### Context

- Align environment variable context propagation name restrictions with
POSIX.1-2024
  and define normalization behavior.

([open-telemetry#4944](open-telemetry#4944))
- Decouple the responsibilities of the environment variable propagation
carrier.

([open-telemetry#4961](open-telemetry#4961))
- Remove misleading implementation approach the environment variable
propagation.

([open-telemetry#5003](open-telemetry#5003))
- Change Environment Variables as Context Propagation Carriers document
status to Beta.

([open-telemetry#5020](open-telemetry#5020))

### Traces

- Stabilize Tracer `enabled` operation

([open-telemetry#4941](open-telemetry#4941))
- Stabilize `AlwaysRecord` sampler.

([open-telemetry#4934](open-telemetry#4934))

### Metrics

- Add development `maxExportBatchSize` parameter to Periodic exporting
MetricReader.

([open-telemetry#4895](open-telemetry#4895))

### Logs

- Add event to span event bridge.

([open-telemetry#5006](open-telemetry#5006))

### Resource

- Clarify that a Resource describes the observed entity, not the
component
  that technically emits telemetry.

([open-telemetry#4905](open-telemetry#4905))

### Compatibility

- Deprecate OpenTracing compatibility requirements in the specification.

([open-telemetry#4938](open-telemetry#4938))
- Stabilize sections of Prometheus and OpenMetrics Compatibility.
- Stabilize Prometheus Classic Histogram to OTLP Explicit Histogram
transformation.

([open-telemetry#4874](open-telemetry#4874))
  - Stabilize Prometheus Timestamp and Start timestamp transformation.

([open-telemetry#4953](open-telemetry#4953))
- Clarify Prometheus Native Histogram to OTLP Exponential Histogram
conversion,
add conversion rules for Native Histograms with Custom Buckets (NHCB) to
OTLP
    Histogram.

([open-telemetry#4898](open-telemetry#4898))
  - Stabilize Prometheus Dropped Types transformation.

([open-telemetry#4952](open-telemetry#4952))
- Stabilize OpenTelemetry Attributes to Prometheus labels
transformation.

([open-telemetry#4963](open-telemetry#4963))
- Stabilize Prometheus Exemplar to OpenTelemetry Exemplar
transformation.

([open-telemetry#4962](open-telemetry#4962))
  - Stabilize Prometheus Metadata transformation.

([open-telemetry#4954](open-telemetry#4954))
- Stabilize OpenTelemetry Metric Metadata to Prometheus metric metadata.

([open-telemetry#4966](open-telemetry#4966))
- Stabilize OpenTelemetry Exemplar to Prometheus Exemplar
transformation.

([open-telemetry#4964](open-telemetry#4964))
- Stabilize sections of Prometheus Metrics Exporter.
  - Stabilize host configuration.

([open-telemetry#5025](open-telemetry#5025))

### SDK Configuration

- Declarative configuration: add in-development guidance for exposing
the
  effective `Resource` returned by `Create`.

([open-telemetry#4949](open-telemetry#4949))
- Require spec changes to consider declarative config schema

([open-telemetry#4916](open-telemetry#4916))
- Add strict YAML parsing guidance to configuration supplementary
guidelines.

([open-telemetry#4878](open-telemetry#4878))

### OTEPs

- Process Context: Sharing Resource Attributes with External Readers.

([open-telemetry#4719](open-telemetry#4719))
- Support multiple Resources within an SDK.

([open-telemetry#4665](open-telemetry#4665))

---------

Co-authored-by: Jack Berg <34418638+jack-berg@users.noreply.github.com>
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@jsuereth jsuereth jsuereth approved these changes

@lmolkova lmolkova lmolkova approved these changes

@pellared pellared pellared approved these changes

@cijothomas cijothomas cijothomas approved these changes

@MrAlias MrAlias MrAlias approved these changes

@arminru arminru arminru approved these changes

@reyang reyang reyang approved these changes

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@carlosalberto @jsuereth @lmolkova @pellared @cijothomas @MrAlias @arminru @reyang @jack-berg