Update metrics.md

[bryce-b]

corrected units to currently reported units from iOS Agent.

• [x] Create PR as draft
• [ ] Approval by at least one other agent
• [ ] Mark as Ready for Review (automatically requests reviews from all agents and PM via CODEOWNERS)
  • Remove PM from reviewers if impact on product is negligible
  • Remove agents from reviewers if the change is not relevant for them
• [ ] Merge after 2 business days passed without objections \ To auto-merge the PR, add /schedule YYYY-MM-DD to the PR description. /schedule 2023-01-31

[apmmachine]

:green_heart: Build Succeeded

the below badges are clickable and redirect to their specific view in the CI or DOCS

Expand to view the summary

#### Build stats * Start Time: 2023-01-27T17:09:15.442+0000 * Duration: 3 min 8 sec