refactor: use promauto and promhttp

[ev1lQuark]

This is a draft PR for #2332

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov-commenter]

Codecov Report

Merging #2333 (f748432) into main (b998087) will decrease coverage by 0.14%.
The diff coverage is 66.66%.

❗ Current head f748432 differs from pull request most recent head ed05537. Consider uploading reports for the commit ed05537 to get more accurate results

@@            Coverage Diff             @@
##             main    #2333      +/-   ##
==========================================
- Coverage   44.24%   44.11%   -0.14%     
==========================================
  Files         294      294              
  Lines       17860    17890      +30     
==========================================
- Hits         7902     7892      -10     
- Misses       9117     9158      +41     
+ Partials      841      840       -1     

Impacted Files	Coverage Δ
metrics/prometheus/common.go	29.59% <62.16%> (-17.95%)	⬇️
metrics/prometheus/metric_set.go	100.00% <100.00%> (ø)
metrics/prometheus/reporter.go	66.66% <100.00%> (+22.22%)	⬆️

... and 1 file with indirect coverage changes

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[chickenlj]

LGTM