cloud: add the real client IP description

[lilyjazz]

to the essential slow query & audit logs

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What is changed, added or deleted? (Required)

Add some description about the real client ip updates for TiDB Cloud Essential.

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• v7.5 (TiDB 7.5 versions)
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[gemini-code-assist]

Summary of Changes

Hello @lilyjazz, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the documentation for TiDB Cloud Essential by providing crucial information regarding the display of real client IP addresses. It clarifies that both audit logs and slow query logs will now show the actual client IP for connections established through PrivateLink, specifically within the AWS us-west-2 region. This update improves transparency and diagnostic capabilities for users leveraging PrivateLink.

Highlights

• Audit Log IP Display: Added a tip to the essential-database-audit-logging.md documentation, clarifying that TiDB Cloud Essential now displays the real client IP in audit logs for traffic coming via PrivateLink on AWS (us-west-2 region).
• Slow Query Log IP Display: Updated the tune-performance.md documentation with a tip stating that TiDB Cloud Essential's slow query logs now also show the real client IP for PrivateLink traffic on AWS (us-west-2 region).
• Documentation Scope Adjustment: Modified the <CustomContent> tag in tune-performance.md to specifically target the "essential" plan for the new slow query IP tip, ensuring its relevance.

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[gemini-code-assist]

Code Review

This pull request adds information about the real client IP being displayed in audit logs and slow query logs for TiDB Cloud Essential clusters. The changes are good and provide useful information to users. My review includes suggestions to improve clarity, conciseness, and structure, mainly by rephrasing the new tip and merging redundant markdown blocks, in line with the repository's documentation style guide.

[ti-chi-bot]

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[qiancai]

Rest LGTM

[qiancai]

Rest LGTM

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2026-01-20 02:16:00.642666408 +0000 UTC m=+460188.256623254: ☑️ agreed by qiancai.
• 2026-01-20 03:42:01.664176506 +0000 UTC m=+465349.278133362: ☑️ agreed by hfxsd.