- Breaking changes: removed InstrumentationLibrary→Scope translation, require explicit storage for the experimental persistent queue, removed several deprecated APIs (HTTPClientSettings, component stability helpers, Flags API), featuregate...
- Deprecations: many stability helper methods, featuregate.Registry.MustApply, obsreport level settings, processorhelper/exporterhelper constructors, and MetricDataPointFlags methods are now deprecated.
- Enhancements: persistent queue is enabled by default, OTLP proto upgraded to v0.19.0, Scope.Attributes exposed in pdata, relaxed pcommon.Value.Equal handling, 404/405 treated as permanent OTLP exporter errors, and scheme name restriction...