- Replace deprecated DataPoint, MetricDataPointFlags, LogRecord flag APIs and remove old structs/helpers, introducing new immutable/mutable equivalents (breaking changes).
- Deprecate a wide range of pcommon and pmetric functions (e.g., SetDataType, MarshalerSizer, Map.Update/Upsert) and shift to newer methods and mutable slice types (deprecation).
- Add builder flag to skip module fetching, enable jsoniter for OTLP JSON unmarshalling, introduce CopyTo/MoveTo for primitive slices, and fix JSON handling bugs (feature, bugfix).