Release 1.47.0 (#4584)
July 2025 release.
### Context
- Add Supplementary Guidelines for environment variables as context
carrier
  specification.
([#4548](#4548))
### Traces
- Define sampling threshold field in OpenTelemetry TraceState; define
the behavior
of TraceIdRatioBased sampler in terms of W3C Trace Context Level 2
randomness.
([#4166](#4166))
- Define CompositeSampler implementation and built-in ComposableSampler
interfaces.
([#4466](#4466))
- Define how SDK implements `Tracer.Enabled`.
([#4537](#4537))
### Logs
- Stabilize `Event Name` parameter of `Logger.Enabled`.
([#4534](#4534))
- Stabilize SDK and No-Op `Logger.Enabled`.
([#4536](#4536))
- `SeverityNumber=0` MAY be used to represent an unspecified value.
([#4535](#4535))
### Baggage
- Add Supplementary Guidelines for environment variables as context
carrier
  specification.
([#4548](#4548))
### Compatibility
- Clarify expectations about Prometheus content negotiation for metric
names.
([#4543](#4543))
---------
Co-authored-by: Armin Ruech <7052238+arminru@users.noreply.github.com>
Co-authored-by: Trask Stalnaker <trask.stalnaker@gmail.com>

Release 1.46.0 (#4544)
### Metrics
- Prometheus receiver can expect `otel_scope_schema_url` and
`otel_scope_[attribute]` labels on all metrics.
([#4505](#4505))
- Prometheus receiver no longer expects `otel_scope_info` metric.
([#4505](#4505))
- Prometheus exporter adds `otel_scope_schema_url` and
`otel_scope_[attribute]` labels on all metrics.
([#4505](#4505))
- Prometheus exporter no longer exports `otel_scope_info` metric.
([#4505](#4505))
### Entities
- Define rules for setting identifying attributes.
([#4498](#4498))
- Define rules for entity-resource referencing model.
([#4499](#4499))
### Common
- Move Instrumentation Scope definition from glossary to a dedicated
document and use normative language.
([#4488](#4488))

Release 1.45.0 (#4495)
May 2025 Release.
### Context
- Drop reference to binary `Propagator`.
([#4490](#4490))
### Logs
- Add optional `Event Name` parameter to `Logger.Enabled` and
`LogRecordProcessor.Enabled`.
([#4489](#4489))
### Resource
- Add experimental resource detector name.
([#4461](#4461))
### OTEPs
- OTEP: Span Event API deprecation plan.
([#4430](#4430))

Release 1.44.0 (#4476)
### Context
- Add context propagation through Environment Variables specification.
([#4454](#4454))
- On Propagators API, stabilize `GetAll` on the `TextMap` Extract.
([#4472](#4472))
### Traces
- Define sampling threshold field in OpenTelemetry TraceState; define
the behavior
of TraceIdRatioBased sampler in terms of W3C Trace Context Level 2
randomness.
([#4166](#4166))
### Metrics
- Clarify SDK behavior for Instrument Advisory Parameter.
([#4389](#4389))
### Logs
- Add `Enabled` opt-in operation to the `LogRecordProcessor`.
([#4439](#4439))
- Stabilize `Logger.Enabled`.
([#4463](#4463))
- Stabilize `EventName`.
([#4475](#4475))
### Baggage
- Add context (baggage) propagation through Environment Variables
specification.
([#4454](#4454))
### Resource
- Add Datamodel for Entities.
([#4442](#4442))
### SDK Configuration
- Convert declarative config env var substitution syntax to ABNF.
([#4448](#4448))
- List declarative config supported SDK extension plugin interfaces.
([#4452](#4452))
---------
Co-authored-by: Armin Ruech <7052238+arminru@users.noreply.github.com>

Release 1.43.0 (#4444)
March 2025 Release.
## v1.43.0 (2025-03-11)
### Traces
- Clarify STDOUT exporter format is unspecified.
([#4418](#4418))
### Metrics
- Clarify STDOUT exporter format is unspecified.
([#4418](#4418))
### Logs
 - Clarify that it is allowed to directly use Logs API.
([#4438](#4438))
- Clarify STDOUT exporter format is unspecified.
([#4418](#4418))
### Supplementary Guidelines
- Add Advanced Processing to Logs Supplementary Guidelines.
([#4407](#4407))
---------
Co-authored-by: Armin Ruech <7052238+arminru@users.noreply.github.com>

Release 1.42.0 (#4410)
February 2025 Release.
### Traces
- Deprecate `exception.escaped` attribute, add link to in-development
semantic-conventions
  on how to record errors across signals.
([#4368](#4368))
- Define randomness value requirements for W3C Trace Context Level 2.
([#4162](#4162))
### Logs
- Define how SDK implements `Logger.Enabled`.
([#4381](#4381))
- Logs API should have functionality for reusing Standard Attributes.
([#4373](#4373))
### SDK Configuration
- Define syntax for escaping declarative configuration environment
variable
  references.
([#4375](#4375))
- Resolve various declarative config TODOs.
([#4394](#4394))

Release 1.41.0 (#4360)
### Logs
- Remove the deprecated Events API and SDK in favor of having Events
support in the Logs API and SDK.
([#4353](#4353))
- Remove `Logger`'s Log Instrumentation operations.
([#4352](#4352))
- Make all `Logger` operations user-facing.
([#4352](#4352))
### SDK Configuration
- Clarify that implementations should interpret timeout environment
variable values of zero as no limit (infinity).
([#4331](#4331))

Release 1.40.0 (#4328)
December 2024 Release.
Mostly in-development additions, e.g.
*
#4183
*
#4295

Release 1.39.0 (#4282)
November 2024 Release.

Release 1.38.0 (#4249)
October 2024 Release.
Changes of special interest:
* [Mark cardinality limits as
Stable](#4222)