pkg: fix cgroup monitor

[rleungx]

What problem does this PR solve?

Issue Number: Ref #7716.

What is changed and how does it work?

Check List

Tests

• Unit test

Release note

None.

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[REVIEW NOTIFICATION]

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• lhy1024

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[codecov]

Codecov Report

Merging #7918 (4dec7d0) into master (b9ea01a) will decrease coverage by 0.04%.
The diff coverage is 56.00%.

❗ Current head 4dec7d0 differs from pull request most recent head d9b469c. Consider uploading reports for the commit d9b469c to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7918      +/-   ##
==========================================
- Coverage   73.56%   73.52%   -0.04%     
==========================================
  Files         436      436              
  Lines       48342    48351       +9     
==========================================
- Hits        35561    35552       -9     
- Misses       9726     9749      +23     
+ Partials     3055     3050       -5     

Flag	Coverage Δ
unittests	73.52% <56.00%> (-0.04%)	⬇️

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[rleungx]

/merge

[ti-chi-bot]

@rleungx: 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: 4dec7d0

[ti-chi-bot]

@rleungx: Your PR was out of date, I have automatically updated it for you.

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