metrics: add col/idx name(s) for BackfillProgressGauge and BackfillTotalCounter

[CbcWestwolf]

What problem does this PR solve?

Issue Number: close #58114

Problem Summary:

For BackfillProgressGauge and BackfillTotalCounter, tidb only shows the database name and table name in the metrics. If we add multiple indexes on a single table, it would be difficult to know the rate and progress of each index.

What changed and how does it work?

• Add column names and index names for metrics.

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.

Test script:

mysql -h 127.0.0.1 -P4000 -uroot -e'create database test1; create database test2;'

sysbench oltp_read_write prepare --db-driver=mysql --mysql-host=127.0.0.1 --mysql-port=4000 --mysql-user=root --mysql-db=test1 --threads=16 --tables=2 --table-size=1000000
sysbench oltp_read_write prepare --db-driver=mysql --mysql-host=127.0.0.1 --mysql-port=4000 --mysql-user=root --mysql-db=test2 --threads=16 --tables=2 --table-size=1000000

# Add Index
mysql -h 127.0.0.1 -P4000 -uroot -e'create index k_pad on test1.sbtest1(pad); alter table test1.sbtest2 add index k_pad(pad), add index k_comp(c, pad);'
mysql -h 127.0.0.1 -P4000 -uroot -e'create index k_pad on test2.sbtest1(pad); alter table test2.sbtest2 add index k_pad(pad), add index k_comp(c, pad);'

# Modify Column
mysql -h 127.0.0.1 -P4000 -uroot -e'alter table test1.sbtest1 change column k k varchar(64); alter table test1.sbtest2 change column k k varchar(64);'
mysql -h 127.0.0.1 -P4000 -uroot -e'alter table test2.sbtest1 change column k k varchar(64); alter table test2.sbtest2 change column k k varchar(64);'

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

[codecov]

Codecov Report

Attention: Patch coverage is 79.12088% with 19 lines in your changes missing coverage. Please review.

Project coverage is 74.9075%. Comparing base (1405c5e) to head (5b8a111).
Report is 42 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #58380        +/-   ##
================================================
+ Coverage   73.1849%   74.9075%   +1.7226%     
================================================
  Files          1681       1727        +46     
  Lines        463027     476996     +13969     
================================================
+ Hits         338866     357306     +18440     
+ Misses       103358      97417      -5941     
- Partials      20803      22273      +1470     

Flag	Coverage Δ
integration	49.1145% <64.8351%> (?)
unit	72.4298% <79.1208%> (+0.1130%)	⬆️

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

Components	Coverage Δ
dumpling	52.6910% <ø> (ø)
parser	∅ <ø> (∅)
br	60.5307% <ø> (+14.5287%)	⬆️

[CbcWestwolf]

/retest

[sre-bot]

All committers have signed the CLA.

[CbcWestwolf]

/retest

[CbcWestwolf]

/retest

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fzzf678, tangenta

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-12-23 05:12:59.049205662 +0000 UTC m=+1452169.138008198: ☑️ agreed by tangenta.
• 2024-12-23 06:45:27.69767329 +0000 UTC m=+1457717.786475831: ☑️ agreed by fzzf678.

[CbcWestwolf]

/retest

[tiprow]

@CbcWestwolf: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
fast_test_tiprow	5b8a111	link	true	/test fast_test_tiprow

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