Fix upper bound for get_pessimistic_udc_balance

[palango]

• Fix upper bound of get_pessimistic_udc_balance
• some minor improvements to remove temporary variables

[codecov]

Codecov Report

Merging #1090 (1d895f1) into master (85bc6c5) will decrease coverage by 0.00%.
The diff coverage is n/a.

❗ Current head 1d895f1 differs from pull request most recent head 2ca88df. Consider uploading reports for the commit 2ca88df to get more accurate results

@@            Coverage Diff             @@
##           master    #1090      +/-   ##
==========================================
- Coverage   88.86%   88.85%   -0.01%     
==========================================
  Files          43       43              
  Lines        3450     3447       -3     
  Branches      429      429              
==========================================
- Hits         3066     3063       -3     
  Misses        278      278              
  Partials      106      106              

Impacted Files	Coverage Δ
src/monitoring_service/handlers.py	89.59% <ø> (-0.14%)	⬇️

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