Release v4.4.2

[Llucs]

4.4.2 - 2026-07-22

• Documentation: remove stale Metrics references from README. The metrics instrumentation (MetricsCollector, PrometheusMetrics, OTelMetrics, StructlogMetrics, get_metrics_collector, set_metrics_collector) was removed as dead code in 4.3.0, but the README still listed a [Metrics](#metrics) ToC entry (broken link), advertised "Prometheus / OpenTelemetry / structlog metrics" in the Features list, and included a "Metrics | Prometheus / OTel" row in the migration table. All three references are now gone.
• Documentation: fix AGENTS.md Release Process step 1, which instructed to bump __version__ in backon/__init__.py. That value is read dynamically from importlib.metadata; only version in pyproject.toml needs bumping. Now consistent with the Versioning section.

Note: mypy python_version stays at 3.10 even though 4.4.0 restored Python 3.9 runtime support. mypy 2.x dropped python_version = "3.9" (minimum supported target is 3.10); 3.9 compatibility is enforced via Union/Optional in module-level aliases, from __future__ import annotations in _decorator.py, and the Python 3.9 entry in the CI matrix.

Validation: All checks pass — ruff, mypy, and 563 tests.

Summary by CodeRabbit

• Documentation

  • Updated release-process guidance to use the project metadata version as the single source of truth.
  • Removed outdated metrics, Prometheus, OpenTelemetry, and structlog references from the README.
  • Added release notes for version 4.4.2, including Python support and documentation corrections.

• Release

  • Bumped the package version to 4.4.2.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 0aa03770-2c22-4ce1-b006-a7d172fef3a1

📥 Commits

Reviewing files that changed from the base of the PR and between 0f761cc and abbad6f.

📒 Files selected for processing (4)

• AGENTS.md
• CHANGELOG.md
• README.md
• pyproject.toml

💤 Files with no reviewable changes (1)

• README.md

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📝 Walkthrough

Walkthrough

The release updates the package version to 4.4.2, changes release instructions to use pyproject.toml as the version source, records the changes in CHANGELOG.md, and removes stale metrics references from README.md.

Changes

Release and documentation updates

Layer / File(s)	Summary
Version source and release notes pyproject.toml, AGENTS.md, CHANGELOG.md	The project version is updated to 4.4.2, release instructions now require bumping only pyproject.toml, and the 4.4.2 changelog entry records these updates.
Stale metrics documentation removal README.md	Metrics references are removed from the table of contents, features list, and migration comparison table.

Estimated code review effort: 2 (Simple) | ~5 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title matches the main change: this PR releases version v4.4.2.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch release-v4.4.2

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