Polish log

[lonre]

What's the purpose of this PR

XXXXX

Which issue(s) this PR fixes:

Fixes #

Brief changelog

XXXXX

Follow this checklist to help us incorporate your contribution quickly and easily:

• Read the Contributing Guide before making this pull request.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Write necessary unit tests to verify the code.
• Run mvn clean test to make sure this pull request doesn't break anything.
• Update the CHANGES log.

[codecov-commenter]

Codecov Report

Merging #3882 (75ff290) into master (2c9b4dc) will increase coverage by 0.01%.
The diff coverage is 33.33%.

@@            Coverage Diff            @@
##             master    #3882   +/-   ##
=========================================
  Coverage     50.13%   50.14%           
- Complexity     2477     2478    +1     
=========================================
  Files           485      485           
  Lines         14983    14984    +1     
  Branches       1532     1532           
=========================================
+ Hits           7511     7513    +2     
+ Misses         6939     6938    -1     
  Partials        533      533           

Impacted Files	Coverage Δ
...ip/framework/apollo/mockserver/EmbeddedApollo.java	92.77% <0.00%> (ø)
...rk/apollo/spring/property/SpringValueRegistry.java	83.78% <50.00%> (+0.45%)	⬆️
.../apollo/internals/RemoteConfigLongPollService.java	77.71% <0.00%> (+0.60%)	⬆️

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[nobodyiam]

LGTM