add queueRemainingSize log at the beginning monitor

[EvenLjj]

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 72.47%. Comparing base (fcd365c) to head (fbd7146).

Additional details and impacted files

@@             Coverage Diff              @@
##                3.x    #1292      +/-   ##
============================================
+ Coverage     72.29%   72.47%   +0.17%     
- Complexity     1985     1993       +8     
============================================
  Files           270      270              
  Lines          7840     7840              
  Branches       1001     1001              
============================================
+ Hits           5668     5682      +14     
+ Misses         1664     1650      -14     
  Partials        508      508              

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