Release 1.56 (#5029)

### Context

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

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

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

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

([#5020](#5020))

### Traces

- Stabilize Tracer `enabled` operation

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

([#4934](#4934))

### Metrics

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

([#4895](#4895))

### Logs

- Add event to span event bridge.

([#5006](#5006))

### Resource

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

([#4905](#4905))

### Compatibility

- Deprecate OpenTracing compatibility requirements in the specification.

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

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

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

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

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

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

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

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

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

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

([#5025](#5025))

### SDK Configuration

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

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

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

([#4878](#4878))

### OTEPs

- Process Context: Sharing Resource Attributes with External Readers.

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

([#4665](#4665))

---------

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

Author: carlosalberto

CHANGELOG.md

@@ -9,15 +9,45 @@ release.
 
 ### Context
 
+### Traces
+
+### Metrics
+
+### Logs
+
+### Baggage
+
+### Profiles
+
+### Resource
+
+### Entities
+
+### Common
+
+### OpenTelemetry Protocol
+
+### Compatibility
+
+### SDK Configuration
+
+### Supplementary Guidelines
+
+### OTEPs
+
+## v1.56.0 (2025-04-20)
+
+### Context
+
 - Align environment variable context propagation name restrictions with POSIX.1-2024
   and define normalization behavior.
-  ([#4914](https://github.com/open-telemetry/opentelemetry-specification/issues/4914))
+  ([#4944](https://github.com/open-telemetry/opentelemetry-specification/pull/4944))
 - Decouple the responsibilities of the environment variable propagation carrier.
-  ([#4961](https://github.com/open-telemetry/opentelemetry-specification/issues/4961))
+  ([#4961](https://github.com/open-telemetry/opentelemetry-specification/pull/4961))
 - Remove misleading implementation approach the environment variable propagation.
-  ([#5003](https://github.com/open-telemetry/opentelemetry-specification/issues/5003))
+  ([#5003](https://github.com/open-telemetry/opentelemetry-specification/pull/5003))
 - Change Environment Variables as Context Propagation Carriers document status to Beta.
-  ([#5020](https://github.com/open-telemetry/opentelemetry-specification/issues/5020))
+  ([#5020](https://github.com/open-telemetry/opentelemetry-specification/pull/5020))
 
 ### Traces
 
@@ -36,10 +66,6 @@ release.
 - Add event to span event bridge.
   ([#5006](https://github.com/open-telemetry/opentelemetry-specification/pull/5006))
 
-### Baggage
-
-### Profiles
-
 ### Resource
 
 - Clarify that a Resource describes the observed entity, not the component
@@ -51,14 +77,10 @@ release.
 - Define merge algorithm.
   ([4768](https://github.com/open-telemetry/opentelemetry-specification/pull/4768))
 
-### Common
-
-### OpenTelemetry Protocol
-
 ### Compatibility
 
 - Deprecate OpenTracing compatibility requirements in the specification.
-  ([#4849](https://github.com/open-telemetry/opentelemetry-specification/issues/4849))
+  ([#4938](https://github.com/open-telemetry/opentelemetry-specification/pull/4938))
 - Stabilize sections of Prometheus and OpenMetrics Compatibility.
   - Stabilize Prometheus Classic Histogram to OTLP Explicit Histogram transformation.
     ([#4874](https://github.com/open-telemetry/opentelemetry-specification/pull/4874))
@@ -82,26 +104,26 @@ release.
     ([#4964](https://github.com/open-telemetry/opentelemetry-specification/pull/4964))
 - Stabilize sections of Prometheus Metrics Exporter.
   - Stabilize host configuration.
-    ([#4984](https://github.com/open-telemetry/opentelemetry-specification/issues/4984))
+    ([#5025](https://github.com/open-telemetry/opentelemetry-specification/pull/5025))
 
 ### SDK Configuration
 
 - Declarative configuration: add in-development guidance for exposing the
   effective `Resource` returned by `Create`.
-  ([#4948](https://github.com/open-telemetry/opentelemetry-specification/issues/4948))
+  ([#4949](https://github.com/open-telemetry/opentelemetry-specification/pull/4949))
 - Require spec changes to consider declarative config schema
   ([#4916](https://github.com/open-telemetry/opentelemetry-specification/pull/4916))
 - Add strict YAML parsing guidance to configuration supplementary guidelines.
   ([#4878](https://github.com/open-telemetry/opentelemetry-specification/pull/4878))
 
-### Supplementary Guidelines
-
 ### OTEPs
 
 - Process Context: Sharing Resource Attributes with External Readers.
   ([#4719](https://github.com/open-telemetry/opentelemetry-specification/pull/4719))
+- Support multiple Resources within an SDK.
+  ([#4665](https://github.com/open-telemetry/opentelemetry-specification/pull/4665))
 
-## v1.55.0 (TODO: update date before merging)
+## v1.55.0 (2025-03-05)
 
 ### Traces
 
@@ -214,9 +236,6 @@ release.
 - Stabilize complex `AnyValue` attribute value types and related attribute limits.
   ([#4794](https://github.com/open-telemetry/opentelemetry-specification/issues/4794))
 
-- Support multiple Resources within an SDK.
-  ([#4665](https://github.com/open-telemetry/opentelemetry-specification/pull/4665))
-
 ## v1.52.0 (2025-12-12)
 
 ### Context