resource_control: update tools compatibility

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Summary by CodeRabbit

• Documentation
  • Clarified that resource control does not affect regular use of BR, TiDB Lightning, or TiCDC, and these tools do not support resource-control DDL operations.
  • Documented that background-task resource control is generally available starting in TiDB v8.5.6, allowing limits on TiKV CPU and I/O for BR backup and restore, IMPORT INTO, and TiDB Lightning tasks.
  • Noted that TiCDC replication and PITR are unsupported, with configuration details and limitations linked.

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ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: Repository: pingcap/docs/.coderabbit.yaml
• Review profile: ASSERTIVE
• Plan: Advanced
• Run ID: 0a05d692-0e57-4ef9-8e49-8192e371e779

📥 Commits

Reviewing files that changed from the base of the PR and between a0a22ca and ce65502.

📒 Files selected for processing (1)

• tidb-resource-control-ru-groups.md

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📝 Walkthrough

The resource-control compatibility documentation now describes background-task limits for BR backup and restore and data import. It also states that TiCDC replication and PITR are unsupported.

Changes: Resource control documentation

Layer / File(s)	Summary
Update tool compatibility details tidb-resource-control-ru-groups.md	The compatibility text documents background-task resource control availability from TiDB v8.5.6 for BR backup and restore and data import, including IMPORT INTO and TiDB Lightning. It notes that TiCDC replication and PITR are unsupported.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~3 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to ce655

No concrete compatibility mismatch is established, so the PR appears ready to merge subject to normal checks.

### Architecture Summary

Architecture risk: 🔵 Low · up to ce655

The change affects 1 system.

Changed systems: tidb-resource-control-ru-groups.md

Architecture concerns
No architecture-level concerns identified.

Review details

Systems and components

• observed — tidb-resource-control-ru-groups.md (service) was modified; 1 changed file maps to changed impact.

Before / after behavior

• observed — Modified behavior in tidb-resource-control-ru-groups.md: The compatibility text removes the claim that BR, TiDB Lightning, and TiCDC resource consumption is not limited. It adds that, starting with TiDB v8.5.6, background-task resource control is GA and can limit TiKV CPU and I/O for BR backup/restore and data import, including IMPORT INTO and TiDB Lightning; TiCDC replication and PITR are unsupported, with configuration details linked.

Pre-merge checks · 4 · 1

Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check		The description selects the affected versions but leaves the required change summary empty. It does not explain what changed or why.	Complete the “What is changed, added, or deleted?” section with a concise summary of the compatibility updates and their rationale.

Passed checks (4 passed)

Check name	Status	Explanation
Title check		The title clearly and concisely identifies the main change: updating resource-control tool compatibility documentation.
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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