cloud: add cloud release notes for release-20261013

[doc-claw-bot]

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

Add the October 13, 2026 TiDB Cloud release notes to tidb-cloud/releases/tidb-cloud-release-notes.md, covering Max RCU updates and manual backups for TiDB Cloud Essential, and Max RCU updates for TiDB Cloud Premium.

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
  • TiDB Cloud Essential instances running CLOUD.202603.x or later can be created or have capacity updated without setting Max RCU. New instances default to Elastic Mode; Limited Mode lets you set a maximum capacity.
  • Eligible Essential instances support manual backups that remain available until deleted.
  • TiDB Cloud Premium instances can be created or have capacity updated without Max RCU. Elastic Mode allocates resources based on workload and supports Baseline RCU and configurable RCU consumption alerts. Limited Mode lets you set a maximum capacity.
  • Existing instances with Max RCU retain their configuration unless it is cleared.

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📝 Walkthrough

Added October 13 release notes for TiDB Cloud Essential and Premium. The notes describe capacity configuration options for both offerings and manual backups for eligible Essential instances.

Changes: TiDB Cloud release notes

Layer / File(s)	Summary
October release notes tidb-cloud/releases/tidb-cloud-release-notes.md	Added Essential notes on capacity modes, existing Max RCU settings, and manual backups. Added Premium notes on Elastic Mode, Baseline RCU, alerts, and existing Max RCU settings.

Priority: ➖ Normal

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Other

Suggested reviewers: qiancai

Merge Risk: 🔵 Low · up to dee05

The new guidance may mislead customers following the linked capacity and backup instructions. The impact is limited to documentation, but those instructions should be aligned before relying on the release notes.

### Architecture Summary

Architecture risk: 🔵 Low · up to dee05

The change affects 1 system.

Changed systems: tidb-cloud

Architecture concerns
No architecture-level concerns identified.

Review details

Systems and components

• observed — tidb-cloud (service) was modified; 1 changed file maps to changed impact.

Before / after behavior

• observed — Modified behavior in tidb-cloud/releases/tidb-cloud-release-notes.md: Added October 13 release notes for Essential: instances running CLOUD.202603.x or later can be created or resized without Max RCU. New instances default to Elastic Mode; Limited Mode allows a maximum capacity limit. Existing configured Max RCU values remain unless cleared, and eligible instances support manual backups retained until explicitly deleted.
• observed — Modified behavior in tidb-cloud/releases/tidb-cloud-release-notes.md: Added October 13 release notes for Premium capacity configuration. Instances can be created or resized without Max RCU; new instances default to Elastic Mode with workload-based resource allocation, optional Baseline RCU, and RCU consumption alerts with custom thresholds. Limited Mode remains available for maximum capacity limits, and existing configured Max RCU values remain unless cleared.

Pre-merge checks: 5

Passed checks: 5 passed

Check name	Status	Explanation
Title check		The title clearly identifies the TiDB Cloud release notes and the October 13, 2026 release date. It is concise and directly related to the changes.
Description check		The description includes the required change summary, affected version, related-link section, and change-type checklist. It omits the AI agent involvement section and does not state whether the first-…
Docstring Coverage		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		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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Reviewing files that changed from the base of the PR and between 727dea6 and a863f23.

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

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Actionable comments posted: 1

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Reviewing files that changed from the base of the PR and between 55f7160 and dee05ed.

📒 Files selected for processing: 1

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

Included review availability: This review used your included allowance. Your plan provides up to 4 included reviews per hour; 3 remain after this review.