fix: format imports in metrics module

[ev1lQuark]

Fix: #2310

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[chickenlj]

LGTM.

[codecov-commenter]

Codecov Report

Merging #2323 (abf0e54) into main (66a152c) will decrease coverage by 0.13%.
The diff coverage is n/a.

❗ Current head abf0e54 differs from pull request most recent head 51be17a. Consider uploading reports for the commit 51be17a to get more accurate results

@@            Coverage Diff             @@
##             main    #2323      +/-   ##
==========================================
- Coverage   44.27%   44.14%   -0.13%     
==========================================
  Files         293      289       -4     
  Lines       17892    17700     -192     
==========================================
- Hits         7922     7814     -108     
+ Misses       9120     9059      -61     
+ Partials      850      827      -23     

Impacted Files	Coverage Δ
metrics/prometheus/after_invocation.go	94.28% <ø> (ø)
metrics/prometheus/api.go	0.00% <ø> (ø)
metrics/prometheus/common.go	47.54% <ø> (ø)
metrics/prometheus/metric_set.go	100.00% <ø> (ø)
metrics/prometheus/reporter.go	44.44% <ø> (-19.45%)	⬇️

... and 12 files with indirect coverage changes

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