Update monitor-alert-email.md

[huoyao1125]

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[ti-chi-bot]

Hi @huoyao1125. Thanks for your PR.

I'm waiting for a pingcap member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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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 enhances the TiDB Cloud documentation by updating the monitor-alert-email.md file. The primary purpose is to inform users about additional alert notification channels, specifically Flashduty and PagerDuty, thereby offering a more complete picture of the available monitoring integrations.

Highlights

• Documentation Update: The documentation for TiDB Cloud alert notifications has been updated to include new integration options.
• New Alert Channels: Flashduty and PagerDuty have been added to the list of supported alert notification channels.
• Formatting Improvement: A minor formatting fix was applied by adding a newline at the end of the file.

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[gemini-code-assist]

Code Review

This pull request updates the email alert monitoring documentation to include Flashduty and PagerDuty as notification channels. My review includes a suggestion to improve the readability and grammar of the sentence listing the available channels. Specifically, I've recommended reordering the list for clarity and using proper punctuation. The addition of a newline at the end of the file is a good practice. For consistency, you might consider applying similar updates to other related monitoring documents (monitor-alert-slack.md, monitor-alert-zoom.md) to include the new channels.

[hfxsd]

/ok-to-test

[hfxsd]

Merged to #22364