log the size of buffered packets

[marten-seemann]

No description provided.

[codecov]

Codecov Report

Base: 85.50% // Head: 85.51% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (123e594) compared to base (424a663).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3571      +/-   ##
==========================================
+ Coverage   85.50%   85.51%   +0.01%     
==========================================
  Files         139      139              
  Lines       10244    10248       +4     
==========================================
+ Hits         8759     8763       +4     
  Misses       1103     1103              
  Partials      382      382              

Impacted Files	Coverage Δ
connection.go	76.44% <100.00%> (ø)
logging/multiplex.go	95.45% <100.00%> (ø)
qlog/event.go	98.12% <100.00%> (+0.01%)	⬆️
qlog/qlog.go	91.25% <100.00%> (+0.09%)	⬆️

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