chore: prepare next release

[otelbot-js]

API (./api/CHANGELOG.md)

1.9.1

🐛 (Bug Fix)

• fix(api): prioritize esnext export condition as it is more specific #5458
• fix(api): update diag consoleLogger to use original console methods to prevent infinite loop when a console instrumentation is present #6395
• fix(api): use Attributes instead of deprecated SpanAttributes in SpanOptions #6478 @overbalance
• fix(diag): change types in DiagComponentLogger from any to unknown#5478 @loganrosen
• fix(api): re-introduce fallback chain for global utils #6523 @pichlermarc

🏠 (Internal)

• refactor(api): refactor to avoid circular deps by merging observable types into Metric.ts #6441 @pichlermarc
• refactor(api): remove "export *" in favor of explicit named exports #4880 @robbkidd
• chore: enable tsconfig isolatedModules #5697 @legendecas
• chore: disallow constructor parameter property syntax #6187 @legendecas
• refactor(api): remove platform-specific globalThis, use globalThis directly #6208 @overbalance
• chore(api): mark ProxyTracerProvider as deprecated #6328 @cjihrig
• chore: enforce import type for type-only imports via ESLint #6467 @overbalance
• perf(api): improve isValidSpanId, isValidTraceId performance #5714 @seemk

Stable SDK (./CHANGELOG.md)

2.6.1

🐛 Bug Fixes

• fix(opentelemetry-instrumentation): improve _warnOnPreloadedModules function not to show warning logs when the module is not marked as loaded #6095 @rlj1202
• fix(sdk-trace-base): derive internal SpanOptions from API type to prevent drift #6478 @overbalance
• fix(span): enforce attributePerEventCountLimit, attributePerLinkCountLimit, linkCountLimit, and attributeValueLengthLimit for event/link attributes #6479 @overbalance

🏠 Internal

• chore: enforce import type for type-only imports via ESLint #6467 @overbalance
• perf(sdk-trace-base): avoid Object.entries in Span.setAttributes #6514 @daniellockyer
• perf(sdk-trace-base): optimize Span.{addEvent,addLink} performance #6516 @daniellockyer
• test(bundlers): broaden bundler test coverage and assert known protobuf dynamic-require failures #6482 @overbalance

Experimental (./experimental/CHANGELOG.md)

0.214.0

💥 Breaking Changes

• feat(configuration)!: rename OTEL_EXPERIMENTAL_CONFIG_FILE to OTEL_CONFIG_FILE #6486 @maryliag
• refactor!(otlp-grpc-exporter-base): remove headers from gRPC exporter config type, passing headers now results in a compile-time error instead of being silently ignored #6487

🚀 Features

• feat(configuration): add sampler configuration parsing support #6409 @MikeGoldsmith
• feat(configuration): add resource detection parsing #6435 @MikeGoldsmith
• feat(configuration): export interfaces required in other packages #6462 @maryliag
• feat(configuration): set MeterProvider on sdk start #6463 @maryliag
• feat(configuration): export interfaces required in other packages #6507 @maryliag

🐛 Bug Fixes

• fix(opentelemetry-instrumentation): access require via globalThis to avoid webpack analysis #6481 @overbalance
• fix(sdk-logs): fix inflated droppedAttributesCount when updating existing attribute keys #6479 @overbalance
• fix(instrumentation-fetch): do not modify the returned type of fetch #6521 @dyladan
• fix(opentelemetry-sdk-node): add missing @opentelemetry/otlp-exporter-base dependency #6520 @gotgenes

🏠 Internal

• chore: enforce import type for type-only imports via ESLint #6467 @overbalance

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.61%. Comparing base (c846919) to head (e8d831d).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6510   +/-   ##
=======================================
  Coverage   95.61%   95.61%           
=======================================
  Files         364      364           
  Lines       12077    12077           
  Branches     2884     2884           
=======================================
  Hits        11548    11548           
  Misses        529      529           

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[pichlermarc]

Blocking this release for now, I'm looking into a potential breaking change introduced in #6208.
I think the change may not be compatible with Node.js 8 (old but still supported by API), also there may be some subtleties that would cause APIs registered on the propose 1.9.1 release not to be backward compatible with runtimes that don't define globalThis anymore, but use a pinned 1.9.0 after registration.

Currently working on reproducers.

[pichlermarc]

ref #6522, I'll work on a fix.

[pichlermarc]

see above comments

[pichlermarc]

Opened #6523 to fix the issue, then we should be able to release.