memory: copy global mem arbitrator metrics to nextgen grafana

[solotzg]

What problem does this PR solve?

Issue Number: ref #58194

Add more metrics about global mem-arbitrator in ng

• copy from https://github.com/pingcap/tidb/pull/63073/changes#diff-e1c40eabcea75f285db03b26d672c728db9d6e797edc0d74f7e56af87066bf9aR25728

What changed and how does it work?

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 @solotzg. Thanks for your PR.

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[codecov]

Codecov Report

❌ Patch coverage is 16.12903% with 26 lines in your changes missing coverage. Please review.
✅ Project coverage is 68.5919%. Comparing base (a14f0c8) to head (8580c6f).
⚠️ Report is 6 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #65042        +/-   ##
================================================
- Coverage   70.7649%   68.5919%   -2.1731%     
================================================
  Files          1895       1873        -22     
  Lines        517875     509764      -8111     
================================================
- Hits         366474     349657     -16817     
- Misses       126884     137745     +10861     
+ Partials      24517      22362      -2155     

Flag	Coverage Δ
integration	41.5677% <9.6774%> (-6.6020%)	⬇️
unit	65.8688% <16.1290%> (+0.3388%)	⬆️

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	38.4552% <ø> (-19.7524%)	⬇️

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[solotzg]

/cc @zimulala

[zimulala]

/ok-to-test

[zimulala]

Do we need to update tidb.json too?

[solotzg]

Do we need to update tidb.json too?

No, those modifications are from tidb.json.

[yibin87]

The metrics seems work both for x and dedicated, why add only for x?

[solotzg]

The metrics seems work both for x and dedicated, why add only for x?

It has been implemented in tidb.json already.

[yibin87]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: yibin87, zimulala

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Details

Needs approval from an approver in each of these files:

• OWNERS [zimulala]
• pkg/metrics/OWNERS [yibin87,zimulala]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-12-17 10:36:30.800241979 +0000 UTC m=+1642135.614019561: ☑️ agreed by zimulala.
• 2025-12-18 01:14:18.442368411 +0000 UTC m=+1694803.256145993: ☑️ agreed by yibin87.