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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)

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

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

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)

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)

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