auto-docs: Update Admin API docs for v26.1.9

[vbotbuildovich]

This PR adds the latest OpenAPI spec for version v26.1.9 of the Redpanda Admin API:

npx doc-tools generate bundle-openapi --tag v26.1.9 --use-admin-major-version --surface admin --out-admin admin/admin-v2.yaml

[coderabbitai]

📝 Walkthrough

Walkthrough

The admin/admin-v2.yaml OpenAPI specification file was updated with new metadata values. The x-generated-at timestamp was updated to reflect the generation time as of 2026-01-23T19:28:04.258Z, and the x-redpanda-core-version was incremented from v25.3.5 to v25.3.6. No changes were made to API paths or operation definitions.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• api-docs#31: Updates metadata in admin/admin-v2.yaml including x-generated-at timestamp and version fields.
• api-docs#50: Modifies admin/admin-v2.yaml and updates x-generated-at and x-redpanda-core-version metadata fields.
• api-docs#29: Introduced the v2 OpenAPI spec and updates its metadata fields like x-generated-at and x-redpanda-core-version.

Suggested reviewers

• kbatuigas
• paulohtb6

🚥 Pre-merge checks | ✅ 1 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Title check	⚠️ Warning	The PR title references updating Admin API docs for v26.1.9, but the actual changes show the spec was generated for v25.3.6, creating a version mismatch.	Update the PR title to accurately reflect the actual version being released, e.g., 'auto-docs: Update Admin API docs for v25.3.6' to match the generated spec version.
Description check	⚠️ Warning	The PR description is related to the changeset but contains a version discrepancy (mentions v26.1.9 in the description while the actual spec was generated for v25.3.6).	Correct the version reference in the description from v26.1.9 to v25.3.6 to align with the actual generated OpenAPI spec version.

✅ Passed checks (1 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch auto-docs/admin-api

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[github-actions]

ℹ️ Redpanda/admin (branch: v2) API content change detected

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[kbatuigas]

Diffs are due to the implemented allOf workaround for this API. redpanda-data/docs-extensions-and-macros#179 adds a post processing step that will apply the workaround to incoming v2 specs