release: update to v4.2.1

[fluent-bot]

Update release 4.2.1 version.

• Created by https://github.com/fluent/fluent-bit/actions/runs/20195480292
• Auto-generated by create-pull-request: https://github.com/peter-evans/create-pull-request

Summary by CodeRabbit

• Documentation
  • Updated Docker and Windows installation guides to include version 4.2.1 with current download links and verification information.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai]

Walkthrough

Documentation updates for version 4.2.1 release. Docker tag table entries expanded with debug and release image specifications. Windows installation page updated with new installer variants, checksums, and version references.

Changes

Cohort / File(s)	Summary
Docker Tags Update installation/downloads/docker.md	Added two new Docker tag entries for version 4.2.1: 4.2.1-debug and 4.2.1 with multi-architecture support (x86_64, arm64v8, arm32v7, s390x) and corresponding descriptions
Windows Installer Updates installation/downloads/windows.md	Updated stable version reference from 4.2.0 to 4.2.1; refreshed all installer variants (exe, zip, msi, winarm64), SHA256 checksums, MSI download links, and version-specific commands/examples

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

• Routine version release documentation updates with predictable structure
• Content changes follow existing formatting patterns without logic or structural modifications
• Verify checksums and installer links are correct and align with actual 4.2.1 release artifacts

Possibly related PRs

• release: update to v4.2.0 #2169: Updates the same documentation files (installation/downloads/docker.md and installation/downloads/windows.md) with similar successive version changes (v4.2.0 → v4.2.1).
• release: update to v4.1.2 #2287: Modifies installation/downloads/docker.md by adding new Docker tag rows (release and debug entries) for different versions.

Suggested reviewers

• patrick-stephens
• eschabell

Poem

🐰 Version four-two-one now hops with pride,
Docker tags and Windows installers side by side,
Multi-architecture paths unfold so wide,
Release notes updated, documentation guide!
Let the checksum dance and installers play,
4.2.1's here to brighten the day! 🎉

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'release: update to v4.2.1' accurately reflects the main change in the pull request, which updates documentation to reference the new stable version 4.2.1 across Docker and Windows installation pages.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch create-pull-request/patch

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[coderabbitai]

Actionable comments posted: 1

📜 Review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 6d31204 and b9076e4.

📒 Files selected for processing (2)

• installation/downloads/docker.md (1 hunks)
• installation/downloads/windows.md (2 hunks)

🧰 Additional context used

🪛 LanguageTool

installation/downloads/windows.md

[grammar] ~131-~131: Use a hyphen to join words.
Context: ... These are now using the Github Actions built versions. Legacy AppVeyor builds a...

(QB_NEW_EN_HYPHEN)

🔇 Additional comments (2)

installation/downloads/docker.md (1)

45-46: Verify new Docker tags/architectures and the announcement link are live.
Given this is release documentation, please confirm fluent/fluent-bit:4.2.1 and fluent/fluent-bit:4.2.1-debug exist on Docker Hub and that their manifest lists x86_64, arm64v8, arm32v7, s390x as documented (and that the v4.2.1 announcement URL resolves).

installation/downloads/windows.md (1)

116-127: Double-check artifact URLs + displayed SHA256 values match the published .sha256 files.
These links/hashes are user copy-paste critical; please verify the packages.fluentbit.io artifacts for 4.2.1 exist for win32/win64/winarm64 (exe/zip/msi) and that the shown hashes match the actual .sha256 contents.

Also applies to: 135-137, 142-143, 152-153

[coderabbitai]

⚠️ Potential issue | 🟡 Minor

Tighten wording: “GitHub Actions-built versions”.
Consider changing “Github Actions built versions” → “GitHub Actions-built versions” (capitalization + hyphenation).

🧰 Tools

🪛 LanguageTool

[grammar] ~131-~131: Use a hyphen to join words.
Context: ... These are now using the Github Actions built versions. Legacy AppVeyor builds a...

(QB_NEW_EN_HYPHEN)

🤖 Prompt for AI Agents

In installation/downloads/windows.md around line 131, the phrase "Github Actions
built versions" uses incorrect capitalization and missing hyphenation; change it
to "GitHub Actions-built versions" to use the proper GitHub capitalization and
add a hyphen to form a compound adjective (i.e., replace "Github Actions built
versions" with "GitHub Actions-built versions").