Fix prometheus instrumentator

[aguschin]

No description provided.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.07 🎉

Comparison is base (90f1f7d) 85.70% compared to head (2aa9741) 85.77%.

❗ Current head 2aa9741 differs from pull request most recent head ffe8b6d. Consider uploading reports for the commit ffe8b6d to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #651      +/-   ##
==========================================
+ Coverage   85.70%   85.77%   +0.07%     
==========================================
  Files         109      109              
  Lines        9921     9922       +1     
==========================================
+ Hits         8503     8511       +8     
+ Misses       1418     1411       -7     

Impacted Files	Coverage Δ
mlem/contrib/prometheus.py	83.72% <100.00%> (+17.05%)	⬆️

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