cloud: add cloud release notes for release-20260728

[doc-claw-bot]

What is changed, added, or deleted? (Required)

• Add the July 28, 2026 TiDB Cloud release note entry for TiDB Cloud Dedicated.

Which TiDB version(s) do your changes apply to? (Required)

• v8.5

What is the related PR or file link(s)?

• Source draft: https://pingcap.feishu.cn/wiki/XBRDwEEsJiNSUGkCgJ4cPuTVn4b

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

Summary by CodeRabbit

• New Features
  • Added Database Audit Logging in public preview for TiDB Cloud Dedicated clusters running TiDB v7.5.6+ or v8.5.2+.
  • Audit logs can be stored in AWS S3, Google Cloud Storage, or Azure Blob Storage.
  • Added configurable filter rules to control which events are captured.
  • Included a link to detailed preview documentation.

[coderabbitai]

📝 Walkthrough

Walkthrough

Adds a July 28, 2026 release-note entry announcing public preview database audit logging for TiDB Cloud Dedicated, including version requirements, supported storage backends, event filters, and documentation.

Changes

Audit logging release note

Layer / File(s)	Summary
Audit logging preview announcement tidb-cloud/releases/tidb-cloud-release-notes.md	Documents database audit logging public preview, supported TiDB versions, S3/GCS/Azure Blob Storage destinations, filter rules, and the preview documentation link.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: qiancai

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
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.
Title check	✅ Passed	The title clearly matches the main change: adding a TiDB Cloud release note for release-20260728.
Description check	✅ Passed	The description includes the required change summary, affected version, and reference link, with only minor template sections left unfilled.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[coderabbitai]

Actionable comments posted: 1

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ℹ️ Review info

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Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

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Run ID: 032fd21a-145f-47b5-940b-c9b290334402

📥 Commits

Reviewing files that changed from the base of the PR and between b25be73 and 27ef831.

📒 Files selected for processing (1)

• tidb-cloud/releases/tidb-cloud-release-notes.md

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2026-07-28 10:08:25.421952699 +0000 UTC m=+1917891.458047754: ☑️ agreed by lilin90.
• 2026-07-28 10:16:10.206880122 +0000 UTC m=+1918356.242975198: ☑️ agreed by qiancai.

[qiancai]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qiancai

The full list of commands accepted by this bot can be found here.

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Details

Needs approval from an approver in each of these files:

• OWNERS [qiancai]

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