metric: show import-into merge speed in nextgen

[D3Hunter]

What problem does this PR solve?

Issue Number: ref #61702

Problem Summary:

What changed and how does it work?

merge speed is gathered after #62550, but we forget to add it for nextgen when add panels for tidb-worker in #63510

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

[tiprow]

Hi @D3Hunter. Thanks for your PR.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.1630%. Comparing base (d7169b2) to head (5f53b95).
⚠️ Report is 10 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #63998        +/-   ##
================================================
+ Coverage   72.7193%   73.1630%   +0.4437%     
================================================
  Files          1850       1851         +1     
  Lines        500310     502662      +2352     
================================================
+ Hits         363822     367763      +3941     
+ Misses       114337     112821      -1516     
+ Partials      22151      22078        -73     

Flag	Coverage Δ
integration	41.9298% <ø> (?)

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

Components	Coverage Δ
dumpling	52.8700% <ø> (ø)
parser	∅ <ø> (∅)
br	46.3772% <ø> (+0.0076%)	⬆️

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.4025%. Comparing base (d7169b2) to head (5f53b95).
⚠️ Report is 273 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #63998        +/-   ##
================================================
+ Coverage   72.7193%   73.4025%   +0.6832%     
================================================
  Files          1850       1852         +2     
  Lines        500310     501818      +1508     
================================================
+ Hits         363822     368347      +4525     
+ Misses       114337     111437      -2900     
+ Partials      22151      22034       -117     

Flag	Coverage Δ
integration	41.9298% <ø> (?)
unit	72.5152% <ø> (+0.2583%)	⬆️

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

Components	Coverage Δ
dumpling	52.8700% <ø> (ø)
parser	∅ <ø> (∅)
br	46.4406% <ø> (+0.0709%)	⬆️

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[D3Hunter]

/retest

[tiprow]

@D3Hunter: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

Details

In response to this:

/retest

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-10-16 11:14:50.705471059 +0000 UTC m=+351996.782723609: ☑️ agreed by joechenrh.
• 2025-10-16 14:58:26.451268073 +0000 UTC m=+365412.528520632: ☑️ agreed by tangenta.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: joechenrh, tangenta, zimulala

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• pkg/metrics/OWNERS [zimulala]

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.5: #65076.