Add grafana configuration support

[chickenlj]

admin:
  grafana: localhost:3000

[codecov-commenter]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (e39d7bb) 48.54% compared to head (c8da113) 48.53%.

❗ Current head c8da113 differs from pull request most recent head 1a7d62f. Consider uploading reports for the commit 1a7d62f to get more accurate results

Files	Patch %	Lines
pkg/admin/services/prometheus_service_impl.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #108      +/-   ##
==========================================
- Coverage   48.54%   48.53%   -0.02%     
==========================================
  Files         149      149              
  Lines        9563     9565       +2     
  Branches       41       41              
==========================================
  Hits         4642     4642              
- Misses       4393     4395       +2     
  Partials      528      528              

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