fix: rename ThreeStats to AggStats

[GGXXLL]

No description provided.

[codecov]

Codecov Report

Merging #184 (23b3b36) into master (ba32e20) will decrease coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #184      +/-   ##
==========================================
- Coverage   80.41%   80.35%   -0.07%     
==========================================
  Files          91       91              
  Lines        3273     3273              
==========================================
- Hits         2632     2630       -2     
- Misses        466      467       +1     
- Partials      175      176       +1     

Impacted Files	Coverage Δ
otkafka/reader_metrics.go	100.00% <ø> (ø)
otkafka/writer_metrics.go	94.87% <ø> (ø)
observability/metrics.go	100.00% <100.00%> (ø)
config/watcher/file.go	58.13% <0.00%> (-4.66%)	⬇️

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