webhook: register metrics only with default stats reporter

[zhouhaibing089]

This is a followup from knative/pkg#2931. RegisterMetrics may register unwanted metrics if the default stats reporter is not used.

/kind cleanup

None

[knative-prow[bot]]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[knative-prow[bot]]

Hi @zhouhaibing089. Thanks for your PR.

I'm waiting for a knative member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[codecov[bot]]

Codecov Report

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

Project coverage is 78.77%. Comparing base (03bf3de) to head (220f45b). Report is 115 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3005      +/-   ##
==========================================
+ Coverage   78.75%   78.77%   +0.01%     
==========================================
  Files         188      188              
  Lines       11107     8870    -2237     
==========================================
- Hits         8747     6987    -1760     
+ Misses       2094     1617     -477     
  Partials      266      266              

:umbrella: View full report in Codecov by Sentry.
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[dprotaso]

/ok-to-test

[github-actions[bot]]

This Pull Request is stale because it has been open for 90 days with no activity. It will automatically close after 30 more days of inactivity. Reopen with /reopen. Mark as fresh by adding the comment /remove-lifecycle stale.

[github-actions[bot]]

This Pull Request is stale because it has been open for 90 days with no activity. It will automatically close after 30 more days of inactivity. Reopen with /reopen. Mark as fresh by adding the comment /remove-lifecycle stale.