- Breaking changes: minimum Go version raised to 1.24, receiverhelper metrics semantics altered, and configgrpc now defaults to TCP transport.
- New features and performance tweaks: otlphttpexporter adds configurable profiles endpoint, experimental pdata memory pooling via feature gate, copy-to optimizations, refcounting for pipeline data, and other low‑level optimizations.
- Deprecations and bug fixes: Profiles.ProfilesDictionary deprecated in favor of Profiles.Dictionary; fixes include exporterhelper goroutine leak, batchprocessor UB, service endpoint handling, and nested config validation.
v1.39.0/v0.133.0
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Add pkg.exporterhelper.queueBatchEnabled feature gate to enable batch settings by default.
Introduced queuebatchprocessor to replace the legacy batchprocessor, promoted memory‑limiter extension to beta stability, and marked configgrpc as stable.