WIP: otel metrics

[Leiyks]

Description

Reviewer checklist

• Test coverage seems ok.
• Appropriate labels assigned.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.62%. Comparing base (0670208) to head (4636d1d).

Additional details and impacted files

@@                             Coverage Diff                              @@
##           rachel.yang/otel-metrics-part2-telemetry    #3535      +/-   ##
============================================================================
- Coverage                                     61.65%   61.62%   -0.04%     
============================================================================
  Files                                           143      143              
  Lines                                         13015    13015              
  Branches                                       1702     1702              
============================================================================
- Hits                                           8025     8020       -5     
- Misses                                         4228     4234       +6     
+ Partials                                        762      761       -1     

see 1 file with indirect coverage changes

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