openmetrics: forward server context

[amenzhinsky]

Fixes #433

[johanbrandhorst]

Well, that seems like a reasonable fix!

[codecov-commenter]

Codecov Report

Merging #434 (de0c9c0) into v2 (6e2c2ac) will decrease coverage by 26.15%.
The diff coverage is 40.31%.

@@             Coverage Diff             @@
##               v2     #434       +/-   ##
===========================================
- Coverage   84.01%   57.86%   -26.16%     
===========================================
  Files          30       38        +8     
  Lines         932     1647      +715     
===========================================
+ Hits          783      953      +170     
- Misses        110      622      +512     
- Partials       39       72       +33     

Impacted Files	Coverage Δ
chain.go	0.00% <ø> (-90.91%)	⬇️
interceptors/auth/auth.go	100.00% <ø> (ø)
interceptors/auth/metadata.go	100.00% <ø> (ø)
interceptors/tags/fieldextractor.go	15.15% <0.00%> (-70.15%)	⬇️
testing/testpb/interceptor_suite.go	0.00% <0.00%> (ø)
testing/testpb/test.manual_extractfields.pb.go	0.00% <0.00%> (ø)
testing/testpb/test.manual_validator.pb.go	0.00% <0.00%> (ø)
testing/testpb/test.pb.go	35.17% <35.17%> (ø)
interceptors/logging/options.go	82.85% <50.00%> (-7.77%)	⬇️
interceptors/reporter.go	55.55% <50.00%> (-6.95%)	⬇️
... and 35 more

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[johanbrandhorst]

Thanks for the fix!