Update monitor-built-in-alerting.md

[huoyao1125]

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[ti-chi-bot]

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[ti-chi-bot]

Hi @huoyao1125. Thanks for your PR.

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[gemini-code-assist]

Summary of Changes

Hello @huoyao1125, 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 updates the TiDB Cloud documentation to include two new alert notification channels, Flashduty and PagerDuty, expanding the available options for users to receive monitoring alerts.

Highlights

• Documentation Update: Added Flashduty and PagerDuty as new alert notification subscription options in the monitor-built-in-alerting.md document.

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[gemini-code-assist]

Code Review

This pull request adds Flashduty and PagerDuty as supported methods for alert notifications. My review suggests a minor improvement to enhance readability. I've recommended sorting the list of notification methods alphabetically, which aligns with the repository style guide's emphasis on clarity.

[hfxsd]

Merged to #22364