metrics: add some etcd pannel

[lhy1024]

What problem does this PR solve?

Issue Number: Ref #4399

What is changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
  

Release note

None.

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[codecov]

Codecov Report

Merging #7999 (74e18f4) into master (2c20897) will increase coverage by 0.01%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7999      +/-   ##
==========================================
+ Coverage   73.60%   73.61%   +0.01%     
==========================================
  Files         436      436              
  Lines       48476    48476              
==========================================
+ Hits        35679    35688       +9     
+ Misses       9739     9731       -8     
+ Partials     3058     3057       -1     

Flag	Coverage Δ
unittests	73.61% <ø> (+0.01%)	⬆️

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[rleungx]

How do they help diagnose the problem?