patch: replace prometheus WithLabelValues with With

[denopink]

• simplify the prometheus code
• fix misunderstanding of WithLabelValues

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.15%. Comparing base (8f6cebe) to head (bbf19e8).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #479   +/-   ##
=======================================
  Coverage   59.15%   59.15%           
=======================================
  Files          18       18           
  Lines        1496     1496           
=======================================
  Hits          885      885           
  Misses        569      569           
  Partials       42       42           

Flag	Coverage Δ
unittests	59.15% <100.00%> (ø)

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