Serving Metric Tweaks

[dprotaso]

Feedback from Evan in knative/docs#6352

• update queue proxy metric description
• stats scraper stat should include namespace

/assign @evankanderson

[evankanderson]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[dprotaso]

sorry - didn't run unit tests locally. Fixed now

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.18%. Comparing base (1fb2561) to head (f2d2a36).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16062      +/-   ##
==========================================
+ Coverage   80.17%   80.18%   +0.01%     
==========================================
  Files         214      214              
  Lines       16892    16893       +1     
==========================================
+ Hits        13543    13546       +3     
+ Misses       2989     2986       -3     
- Partials      360      361       +1     

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[evankanderson]

/lgtm

[dprotaso]

/cherry-pick release-1.19

[knative-prow-robot]

@dprotaso: new pull request created: #16063

Details

In response to this:

/cherry-pick release-1.19

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