stop ignoring errors while processing metrics.

[rghetia]

fixes #235

[songy23]

Please fix the CI failure.

[codecov-io]

Codecov Report

Merging #236 into master will decrease coverage by 0.35%.
The diff coverage is 30.76%.

@@            Coverage Diff             @@
##           master     #236      +/-   ##
==========================================
- Coverage   73.72%   73.36%   -0.36%     
==========================================
  Files          15       15              
  Lines        1625     1637      +12     
==========================================
+ Hits         1198     1201       +3     
- Misses        350      358       +8     
- Partials       77       78       +1

Impacted Files	Coverage Δ
metrics.go	78.47% <30.76%> (-2.33%)	⬇️

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[songy23]

LGTM