reference: update doc for follower read

[qiancai]

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• 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)

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

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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 (in Chinese).

• 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)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)
• v6.1 (TiDB 6.1 versions)
• v5.4 (TiDB 5.4 versions)

What is the related PR or file link(s)?

• This PR is translated from: reference: update doc for follower read docs-cn#20703
• Other reference link(s):

Do your changes match any of the following descriptions?

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

[gemini-code-assist]

Summary of Changes

Hello @qiancai, 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 new documentation file, temp.md, as part of an effort to update information related to "follower read" functionality in TiDB. While the file currently contains placeholder text, its inclusion signifies the start of a documentation update that will be applied across the master, v9.0, and v8.5 versions, and is based on a translated contribution from the Chinese documentation.

Highlights

• Documentation Update Initiative: This pull request initiates an update to the documentation concerning "follower read" functionality by adding a new file, temp.md. The current content of temp.md is a placeholder.
• Version Propagation: The documentation changes are slated for integration into the master, v9.0, and v8.5 branches of the TiDB documentation.
• Cross-Language Translation: The content of this PR is a translation derived from an existing documentation update originally made in the Chinese documentation repository.

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[gemini-code-assist]

Code Review

The pull request adds a new file named temp.md containing the text "This is a test file.". Since this is a documentation repository, I will review the content for adherence to the style guide.

[qiancai]

/gemini review

[gemini-code-assist]

Code Review

This pull request significantly refactors the 'Follower Read' documentation to improve its structure and clarity for users. It introduces new sections on applicable scenarios and basic monitoring, and provides clearer recommendations on which tidb_replica_read configurations to use. The changes also include updates to the Grafana dashboard and system variable documentation to reflect new features. My review focuses on further improving clarity, correcting minor grammatical issues, and ensuring consistency, in line with the repository's style guide. I've also identified a translation artifact that needs to be corrected.

[ti-chi-bot]

@you06: adding LGTM is restricted to approvers and reviewers in OWNERS files.

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[lilin90]

/lgtm

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-10-30 07:51:28.825502038 +0000 UTC m=+1549394.902754588: ☑️ agreed by lilin90.

[qiancai]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qiancai

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• OWNERS [qiancai]

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.5: #22000.