feat: improve watch for polaris registrar

[houseme]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 95.12% and project coverage change: +0.05 🎉

Comparison is base (4ad508c) 79.15% compared to head (3504d21) 79.20%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2788      +/-   ##
==========================================
+ Coverage   79.15%   79.20%   +0.05%     
==========================================
  Files         632      632              
  Lines       52174    52231      +57     
==========================================
+ Hits        41298    41371      +73     
+ Misses       8830     8816      -14     
+ Partials     2046     2044       -2     

Flag	Coverage Δ
go-1.15-386	79.15% <69.51%> (-0.03%)	⬇️
go-1.15-amd64	79.17% <69.51%> (-0.02%)	⬇️
go-1.16-386	79.22% <91.46%> (+0.05%)	⬆️
go-1.16-amd64	79.16% <69.51%> (-0.03%)	⬇️
go-1.17-386	79.16% <69.51%> (-0.01%)	⬇️
go-1.17-amd64	79.15% <69.51%> (-0.01%)	⬇️
go-1.18-386	78.84% <91.46%> (+0.05%)	⬆️
go-1.18-amd64	78.82% <95.12%> (?)
go-1.19-386	79.20% <95.12%> (?)
go-1.19-amd64	79.18% <69.51%> (+0.01%)	⬆️
go-1.20-386	79.21% <91.46%> (?)
go-1.20-amd64	79.18% <95.12%> (?)

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Impacted Files	Coverage Δ
contrib/registry/polaris/polaris_registry.go	85.00% <ø> (ø)
net/gsvc/gsvc_discovery.go	50.70% <0.00%> (-0.69%)	⬇️
contrib/registry/polaris/polaris_watcher.go	91.89% <95.23%> (+29.59%)	⬆️
contrib/registry/polaris/polaris_discovery.go	80.39% <100.00%> (+1.66%)	⬆️

... and 3 files with indirect coverage changes

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