Context

• Clarify that environment variable propagation carriers normalize requested keys, carrier keys, and returned keys. (#5102)
• Specify that environment variable propagation carriers only read and return normalized environment variable names. (#5144)
• Specify that an empty environment variable propagation name is non-normalized and normalizes to _. (#5163)

Profiles

• Remove duplicate information from and extend Profiles documentation (README.md, pprof.md). (#4932)

Entities

• Add specification for communicating entity information as structured log events. (#4836)

Common

• Add an in-development SDK self-observability section, referenced from the Tracing, Metrics, and Logs SDK specs. (#5087)
• Clarify non-OTLP representation guidance for nested AnyValue values in arrays and maps. (#5053)
• Add in-development guidance recommending a JSON object as the string representation for an attribute in non-OTLP protocols. (#5028)
• Add in-development guidance recommending a JSON object as the string representation for an attribute collection in non-OTLP protocols. (#5110)

Compatibility

• Deprecate OpenCensus compatibility requirements in the specification. (#5138)
• Stabilize sections of Prometheus Metrics Exporter.
  • Clarify resource attributes configuration. (#5084)
  • Stabilize the conversion of OTLP Summaries into Prometheus Summaries. (#5107)
  • Stabilize client libs section. (#5106)
  • Stabilize Prometheus Metrics Exporter default aggregation configuration. (#5113)
• Stabilize sections of Prometheus and OpenMetrics Compatibility.
  • Stabilize OpenTelemetry Histogram to Prometheus Histogram transformation. (#5091)
• Add optional OpenTelemetry Histogram to Prometheus Native Histogram with Custom Buckets transformation. (#5091)

SDK Configuration

• Add link to declarative config IdGenerator type (#5133)

OTEPs

• Context-scoped Attributes. (#4931)

New Contributors

• @itssaharsh made their first contribution in https://github.com/open-telemetry/opentelemetry-specification/pull/5112
• @christos68k made their first contribution in https://github.com/open-telemetry/opentelemetry-specification/pull/4932
• @Krishnachaitanyakc made their first contribution in https://github.com/open-telemetry/opentelemetry-specification/pull/5138