feat: Improve error handling in prometheus exporter

[tongoss]

fix #7066

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.9%. Comparing base (a817caa) to head (12f6459).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #7363     +/-   ##
=======================================
+ Coverage   85.7%   85.9%   +0.1%     
=======================================
  Files        289     289             
  Lines      25377   25382      +5     
=======================================
+ Hits       21773   21819     +46     
+ Misses      3223    3191     -32     
+ Partials     381     372      -9     

Files with missing lines	Coverage Δ
exporters/prometheus/exporter.go	90.7% <100.0%> (+7.2%)	⬆️

... and 2 files with indirect coverage changes

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[dashpole]

thanks for taking this on!

[MrAlias]

@tongoss are you still able to work on this?

[tongoss]

@tongoss are you still able to work on this?

@MrAlias , my sincere apologies for the delay. I am able to continue working on this. I will try to get PR ready for review by the end of this week.

[tongoss]

@MrAlias , this PR is ready for another review.

[dashpole]

Great work