always use default metric definitions

[danielcohenlive]

Reviewed By: lena-kashtelyan

Differential Revision: D62775368

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D62775368

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.67%. Comparing base (ef4111f) to head (226be09).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2771 +/- ## ======================================= Coverage 95.67% 95.67% ======================================= Files 486 486 Lines 47707 47709 +2 ======================================= + Hits 45643 45645 +2 Misses 2064 2064 ```

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[facebook-github-bot]

This pull request has been merged in facebook/Ax@b1b767848c1f08e3af7f707491caa6dc3684c35c.