resource_manager: record the max RU per second (#7936)

[ti-chi-bot]

This is an automated cherry-pick of #7936

What problem does this PR solve?

Issue Number: Close #7908

When I only run workload A:

sysbench --mysql-user=user1 --mysql-host=10.2.12.53 --mysql-port=32335 --table-size=10000000  oltp_read_only run --time=1000 --report-interval=1 --threads=4  --mysql-db=test --tables=32 --rate=2

RU Avg is OK because the workload is stable.

But When I manually run the big query SQL like:

select count(*) from test.sbtest1;

The monitoring was not very accurate(on-avg), which led me to mistakenly believe that I was far away from triggering RC control.

But from the slow query:

it cost 8000+ RU, and which let some query need wait in the RC queue

What is changed and how does it work?

resource_manager: record the max RU per second 

Check List

Tests

• Unit test
• Integration test

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• HuSharp
• nolouch

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[codecov]

Codecov Report

Merging #7968 (e66679f) into release-7.5 (8783927) will increase coverage by 0.00%.
Report is 2 commits behind head on release-7.5.
The diff coverage is 94.00%.

❗ Current head e66679f differs from pull request most recent head bb658c8. Consider uploading reports for the commit bb658c8 to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##           release-7.5    #7968   +/-   ##
============================================
  Coverage        74.51%   74.52%           
============================================
  Files              444      444           
  Lines            48156    48203   +47     
============================================
+ Hits             35883    35921   +38     
- Misses            9079     9084    +5     
- Partials          3194     3198    +4     

Flag	Coverage Δ
unittests	74.52% <94.00%> (+<0.01%)	⬆️

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

[nolouch]

/merge

[ti-chi-bot]

@nolouch: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

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[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: e66679f

[ti-chi-bot]

@ti-chi-bot: Your PR was out of date, I have automatically updated it for you.

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