br: enhance logging and metrics for SST and restore processes (#65290)

[ti-chi-bot]

This is an automated cherry-pick of #65290

Signed-off-by: Juncen Yu yujuncen@pingcap.com

What problem does this PR solve?

Issue Number: ref #65288, ref #64814

Problem Summary:
See the issue.

What changed and how does it work?

Add batch#, region# and so on to track restoring SST.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No need to test

  • I checked and no code files have been changed.

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[ti-chi-bot]

@YuJuncen This PR has conflicts, I have hold it.
Please resolve them or ask others to resolve them, then comment /unhold to remove the hold label.

[ti-chi-bot]

@ti-chi-bot: ## If you want to know how to resolve it, please read the guide in TiDB Dev Guide.

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[codecov]

Codecov Report

❌ Patch coverage is 90.54054% with 7 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (release-8.5@9b0a76f). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-8.5     #65370   +/-   ##
================================================
  Coverage               ?   73.3949%           
================================================
  Files                  ?       1680           
  Lines                  ?     470073           
  Branches               ?          0           
================================================
  Hits                   ?     345010           
  Misses                 ?     102279           
  Partials               ?      22784           

Flag	Coverage Δ
integration	51.0355% <83.7837%> (?)
unit	65.0964% <20.2702%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
dumpling	52.9278% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	64.2037% <0.0000%> (?)

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[EmmaDuDu]

/retest

[ti-chi-bot]

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

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: BornChanger, RidRisR, YuJuncen

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Details

Needs approval from an approver in each of these files:

• br/OWNERS [BornChanger,YuJuncen]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2026-01-07 04:00:53.263570712 +0000 UTC m=+761209.081879144: ☑️ agreed by YuJuncen.
• 2026-01-07 04:19:36.665103015 +0000 UTC m=+762332.483411447: ☑️ agreed by BornChanger.

[YuJuncen]

/unhold

[EmmaDuDu]

/test pull-br-integration-test

[tiprow]

@EmmaDuDu: The specified target(s) for /test were not found.
The following commands are available to trigger required jobs:

• /test fast_test_tiprow_for_release

Use /test all to run all jobs.

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In response to this:

/test pull-br-integration-test

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[EmmaDuDu]

/retest

[YuJuncen]

/retest

[YuJuncen]

/retest

[EmmaDuDu]

/test unit-test

[tiprow]

@EmmaDuDu: The specified target(s) for /test were not found.
The following commands are available to trigger required jobs:

• /test fast_test_tiprow_for_release

Use /test all to run all jobs.

Details

In response to this:

/test unit-test

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.