Improve log filter example

[reyang]

1. applied best practices
2. updated the filter example to match with the guidance

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.75%. Comparing base (6250307) to head (7025be8).
Report is 113 commits behind head on main.

❗ Current head 7025be8 differs from pull request most recent head 861b961. Consider uploading reports for the commit 861b961 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5406      +/-   ##
==========================================
+ Coverage   83.38%   84.75%   +1.37%     
==========================================
  Files         297      281      -16     
  Lines       12531    12079     -452     
==========================================
- Hits        10449    10238     -211     
+ Misses       2082     1841     -241     

Flag	Coverage Δ
unittests	?
unittests-Solution-Experimental	84.66% <ø> (?)
unittests-Solution-Stable	84.74% <ø> (?)

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see 55 files with indirect coverage changes