Fix broken throughput computation

[XkunW]

PR Type

[Fix]

Short Description

Throughput calculation in metrics command is broken due to previous collectors not cached properly

[codecov-commenter]

Codecov Report

❌ Patch coverage is 40.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.32%. Comparing base (8442168) to head (5e1ce48).

Files with missing lines	Patch %	Lines
vec_inf/client/api.py	25.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #150      +/-   ##
==========================================
- Coverage   91.47%   91.32%   -0.15%     
==========================================
  Files          14       14              
  Lines        1232     1234       +2     
==========================================
  Hits         1127     1127              
- Misses        105      107       +2     

Files with missing lines	Coverage Δ
vec_inf/cli/_cli.py	87.34% <100.00%> (ø)
vec_inf/client/api.py	71.42% <25.00%> (-2.11%)	⬇️

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