v8.5.6 ticdc: add scheduler configuration recommendations for table split mode (#22483)

[ti-chi-bot]

This is an automated cherry-pick of #22483

Update TOC and the ticdc integration guide to include ksqlDB and SQL Server. The TOC entry for the Confluent/Snowflake integration is expanded with nested links for Confluent Cloud, Snowflake, ksqlDB, and SQL Server, and the document title, H1, and summary in ticdc/integrate-confluent-using-ticdc.md are updated to reflect the broader integration coverage.

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• This PR is translated from:ticdc: add the description for scheduler config setting docs-cn#21381
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[gemini-code-assist]

Summary of Changes

Hello @ti-chi-bot, 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 TiCDC documentation by providing crucial guidance on configuring table-level task splitting. It introduces recommended settings for optimizing performance and understanding the behavior of the new TiCDC architecture, ensuring users can effectively manage data replication.

Highlights

• TiCDC Table Splitting Configurations: Introduced a new section in the TiCDC architecture documentation detailing recommended configurations for table-level task splitting, including guidance on scheduler.region-threshold, scheduler.region-count-per-span, and scheduler.write-key-threshold.
• New Configuration Parameter Documentation: Added documentation for the scheduler.region-count-per-span parameter in the TiCDC changefeed configuration guide, explaining its purpose and default value in the new architecture.

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Changelog

• ticdc/ticdc-architecture.md
  • Added a new section "Recommended configurations for table-level task splitting" to provide detailed guidance on scheduler parameters.
  • Updated the note regarding MySQL sink changefeeds to clarify "table-level task splitting mode".
• ticdc/ticdc-changefeed-config.md
  • Documented the scheduler.region-count-per-span parameter, including its introduction version, purpose, and default value.

Activity

• This pull request is an automated cherry-pick of ticdc: add scheduler configuration recommendations for table split mode #22483.

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[gemini-code-assist]

Code Review

This pull request adds helpful documentation on the recommended scheduler configurations for table-level task splitting in TiCDC's new architecture. The changes are clear and provide valuable guidance for users. I've made a few minor suggestions to improve wording for better clarity and consistency, following the repository's documentation style guide.

[hfxsd]

/approve

[hfxsd]

/retest

[hfxsd]

/approve

[hfxsd]

/approve

[hfxsd]

/retest

[hfxsd]

/approve

[hfxsd]

/retest

[hfxsd]

/approve

[ti-chi-bot]

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