GA release 1.3.5

[rads-1996]

1.3.5 (2026-07-01)

Features Added

• Pass metrics observations to upstream SDKStats Manager
  (#191)
• Enable sensitive data for LangChain programmatically
  (#201)

Bugs Fixed

• Add actionable 403 error message
  (#213)
• Remove internal model/tool spans
  (#212)

Other Changes

• Update otel dependencies
  (#218)
• Add pre-commit hook for auto-formatting
  (#220)
• Remove specific co-code owners
  (#221)
• Documentation improvements for published API reference
  (#214)

[Copilot]

Pull request overview

Release-prep PR for microsoft-opentelemetry v1.3.5, updating the package version metadata and documenting the release contents in the changelog.

Changes:

• Bump package version from 1.3.4 → 1.3.5 in runtime and packaging metadata.
• Add the 1.3.5 release entry to CHANGELOG.md (features, bug fixes, and other changes with PR links).

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/microsoft/opentelemetry/_version.py	Updates the runtime-exposed VERSION constant to 1.3.5.
pyproject.toml	Updates the package metadata version to 1.3.5 for distribution builds.
CHANGELOG.md	Adds the 1.3.5 release notes section with categorized entries and PR references.

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[github-actions]

Performance comparison

Threshold: regressions >15.0% on gating scenarios fail the build. Higher ops/s is better; positive Δ means the PR is slower.

Scenario	Gating	Baseline (ops/s)	Candidate (ops/s)	Δ %	Status
azure_monitor_log	yes	17,728.9	18,180.8	-2.49%	✅
azure_monitor_span	yes	156,445.6	153,092.5	+2.19%	✅
otel_log	no	21,660.5	21,441.7	+1.02%	✅
otel_span	no	38,943.8	38,067.7	+2.30%	✅