cloud: changefeed feature is only available upon request

[ginkgoch]

First-time contributors' checklist

• I've signed the Contributor License Agreement, which is required for the repository owners to accept my contribution.

What is changed, added or deleted? (Required)

The changefeed on essential status is updated to private preview. So the documents should be updated accordingly.

Which TiDB version(s) do your changes apply to? (Required)

Tips for choosing the affected version(s):

By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.

For details, see tips for choosing the affected versions.

• master (the latest development version)
• v9.0 (TiDB 9.0 versions)
• v8.5 (TiDB 8.5 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
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Do your changes match any of the following descriptions?

• Delete files
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• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

[ti-chi-bot]

Hi @ginkgoch. 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]

Code Review

This pull request updates the TiDB Cloud changefeed documentation to reflect that the feature is now available upon request, providing instructions on how to submit a support ticket, and updates the features table to display a lock icon for this feature. The review feedback recommends style guide adjustments, including using sentence case for headings, adding a blank line before the list in the note block, and maintaining lowercase consistency for the term 'changefeed'.

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[hfxsd]

/retest

[hfxsd]

/ok-to-test

[qiancai]

Rest LGTM

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2026-06-04 07:40:46.19479166 +0000 UTC m=+427347.265109050: ☑️ agreed by qiancai.
• 2026-06-04 07:52:10.26236913 +0000 UTC m=+428031.332686520: ☑️ agreed by hfxsd.

[hfxsd]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hfxsd

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