[Bug] VX-268: Use exported_node to query metric fome node-exporter

[WakeupTsai]

No description provided.

[John-Lin]

如果名稱會混淆可能考慮要記一下文件 @WakeupTsai

[codecov-io]

Codecov Report

Merging #249 into develop will decrease coverage by 0.02%.
The diff coverage is 76.92%.

@@             Coverage Diff             @@
##           develop     #249      +/-   ##
===========================================
- Coverage    78.29%   78.26%   -0.03%     
===========================================
  Files           53       53              
  Lines         2649     2655       +6     
===========================================
+ Hits          2074     2078       +4     
- Misses         437      438       +1     
- Partials       138      139       +1

Impacted Files	Coverage Δ
src/prometheuscontroller/controller.go	86.55% <76.92%> (-0.25%)	⬇️

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