cloud: add cloud release notes for release-20260901

[doc-claw-bot]

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

Add the September 1, 2026 TiDB Cloud release notes to tidb-cloud/releases/tidb-cloud-release-notes.md from the reviewed source draft.
This update covers the Essential and Premium general changes, plus the Essential billing adjustments released on September 1, 2026.

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

• v8.5

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

None

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

  • Premium users can access the Events page.
  • Premium audit logging now supports configurable filter rules.
  • Support can temporarily access Plan Replayer files for Essential and Premium plans to assist with SQL troubleshooting.

• Billing Updates

  • Starting September 1, 2026, Essential backup usage and network egress incur charges.
  • Network egress appears as a separate billing line item.

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📝 Walkthrough

Walkthrough

The release notes add a September 1, 2026 section. It documents Plan Replayer Support access, Premium Events and audit-log updates, and Essential backup and network egress billing changes.

Changes

TiDB Cloud September 2026 release notes

Layer / File(s)	Summary
September 2026 feature and billing updates tidb-cloud/releases/tidb-cloud-release-notes.md	Documents Plan Replayer Support access, the Premium Events page, Premium audit-log filters, and Essential backup and network egress billing changes.

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

Merge Risk: ⚪ Minimal · up to a7e4f

This is a localized release-notes documentation update with no actionable merge-blocking risk remaining after normal checks and review.

Suggested reviewers: qiancai

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the TiDB Cloud release-notes update and specifies release 20260901.
Description check	✅ Passed	The description explains the documentation change, identifies the affected version, and includes the related-change checklist. It omits the AI agent involvement section, but the required content is ot…
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
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.

Full details: Description check

Explanation

The description explains the documentation change, identifies the affected version, and includes the related-change checklist. It omits the AI agent involvement section, but the required content is otherwise mostly complete.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.)

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests

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