add integration migration guide

[Yujie-Xie]

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[gemini-code-assist]

Summary of Changes

Hello @Yujie-Xie, 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 introduces a crucial new documentation page for TiDB Cloud users, outlining the migration path for metrics integration. It guides users through the process of moving from a deprecated project-level metrics integration to a more controlled and flexible cluster-level integration, ensuring they can maintain their monitoring capabilities with the updated system.

Highlights

• New Migration Guide Added: A new document, 'Metrics Integration Migration Guide', has been added to assist users in transitioning their monitoring setups.
• Migration from Project-Level to Cluster-Level Integration: The guide details the process of migrating from the legacy project-level metrics integration to the new, more granular cluster-level integration within TiDB Cloud.
• Step-by-Step Instructions: The document provides clear, step-by-step instructions for disabling the old integration and enabling the new integration for each cluster.
• Impact Statement Included: An 'Impact Statement' section warns users about potential temporary data loss during the migration process.

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[gemini-code-assist]

Code Review

This pull request adds a new migration guide for metrics integration. The document is well-structured and clear. I have provided a few suggestions to improve conciseness, correct a grammatical error in a heading, and rephrase a sentence in the impact statement to better align with the style guide by using active voice and present tense.

[huoyao1125]

Looks good to me

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-09-26 07:14:39.113244489 +0000 UTC m=+600089.183738171: ☑️ agreed by hfxsd.

[qiancai]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qiancai

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