mcs: improve scheduling service log

[rleungx]

What problem does this PR solve?

Issue Number: Ref #5839.

What is changed and how does it work?

Check List

Tests

• Unit test

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• lhy1024
• nolouch

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[codecov]

Codecov Report

Merging #7060 (77769df) into master (74ead5c) will increase coverage by 0.01%.
Report is 1 commits behind head on master.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           master    #7060      +/-   ##
==========================================
+ Coverage   74.37%   74.38%   +0.01%     
==========================================
  Files         436      436              
  Lines       46435    46440       +5     
==========================================
+ Hits        34537    34546       +9     
+ Misses       8876     8867       -9     
- Partials     3022     3027       +5     

Flag	Coverage Δ
unittests	74.38% <75.00%> (+0.01%)	⬆️

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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: 77769df