minor refactoring of activator request metrics

[dprotaso]

No description provided.

[dprotaso]

/assign @linkvt
/cc @prashanthjos

[knative-prow]

@dprotaso: GitHub didn't allow me to request PR reviews from the following users: prashanthjos.

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/assign @linkvt
/cc @prashanthjos

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.18%. Comparing base (9c43aa8) to head (f9613ea).
⚠️ Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16381      +/-   ##
==========================================
- Coverage   80.26%   80.18%   -0.09%     
==========================================
  Files         216      216              
  Lines       13483    13487       +4     
==========================================
- Hits        10822    10814       -8     
- Misses       2294     2306      +12     
  Partials      367      367              

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[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dprotaso, prashanthjos

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[linkvt]

/lgtm