chore(consumer): remove metrics

[appleboy]

fix #50

Signed-off-by: Bo-Yi Wu [email protected]

[codecov-commenter]

Codecov Report

Merging #51 (2510c2f) into master (fd4ed0b) will increase coverage by 0.37%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #51      +/-   ##
==========================================
+ Coverage   84.77%   85.15%   +0.37%     
==========================================
  Files          10       10              
  Lines         440      431       -9     
==========================================
- Hits          373      367       -6     
+ Misses         62       59       -3     
  Partials        5        5              

Flag	Coverage Δ
go-1.13	84.45% <ø> (-0.32%)	⬇️
go-1.14	84.45% <ø> (-0.32%)	⬇️
go-1.15	84.45% <ø> (-0.32%)	⬇️
go-1.16	84.45% <ø> (-0.32%)	⬇️
go-1.17	85.15% <ø> (+0.37%)	⬆️
go-1.18	84.45% <ø> (-0.32%)	⬇️
ubuntu-latest	85.15% <ø> (+0.37%)	⬆️

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Impacted Files	Coverage Δ
consumer.go	88.88% <ø> (-1.02%)	⬇️
queue.go	87.57% <0.00%> (+1.12%)	⬆️
worker_empty.go	50.00% <0.00%> (+25.00%)	⬆️

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