cloud: add Flashduty and PagerDuty docs

[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 introduces comprehensive documentation for integrating TiDB Cloud alert notifications with Flashduty. It provides users with a clear guide on setting up Flashduty webhooks and configuring their TiDB Cloud projects to receive alerts, thereby enhancing their incident management capabilities. The new guide ensures that users can effectively monitor their clusters and respond to issues in a timely manner, particularly those on Enterprise or Premium support plans.

Highlights

• New Documentation for Flashduty Integration: A new document has been added detailing how to subscribe to TiDB Cloud alert notifications using Flashduty.
• Prerequisites for Flashduty Alerts: The document outlines the necessary conditions, including requiring an Enterprise or Premium support plan and specific access roles (Organization Owner or Project Owner) in TiDB Cloud.
• Step-by-Step Subscription Guide: Detailed instructions are provided for generating a Flashduty webhook URL and subsequently configuring the subscription within the TiDB Cloud console.
• Unsubscription Process: The document also includes clear steps on how to unsubscribe from Flashduty alert notifications.

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[gemini-code-assist]

Code Review

This pull request adds a new documentation page for subscribing to TiDB Cloud alerts via Flashduty. The overall structure is good and consistent with other similar documents. I've found a critical issue with the instructions for generating a Flashduty webhook, which appear to be incorrect placeholders. I've provided a suggestion with the correct steps. I also have a minor suggestion to ensure the list of integrations is consistent across all related documents. Please review the suggested changes.

[hfxsd]

/ok-to-test

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
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[huoyao1125]

LGTM

[iguoyr]

LGTM

[ti-chi-bot]

@iguoyr: adding LGTM is restricted to approvers and reviewers in OWNERS files.

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LGTM

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