[#10776] Clean up the Metrics Data API

[minwoo-jung]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.

Project coverage is 37.05%. Comparing base (b848e25) to head (7c926aa).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
.../web/controller/OpenTelemetryMetricController.java	0.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #11552   +/-   ##
=========================================
  Coverage     37.05%   37.05%           
  Complexity    12231    12231           
=========================================
  Files          4041     4041           
  Lines         99056    99053    -3     
  Branches      10437    10437           
=========================================
  Hits          36702    36702           
+ Misses        59369    59366    -3     
  Partials       2985     2985           

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