Resume the development of 1.15

[houshengbo]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.21%. Comparing base (f32bc7c) to head (b1a58f2).
Report is 24 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1789      +/-   ##
==========================================
+ Coverage   63.54%   66.21%   +2.67%     
==========================================
  Files          53       53              
  Lines        2584     2081     -503     
==========================================
- Hits         1642     1378     -264     
+ Misses        827      588     -239     
  Partials      115      115              

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[matzew]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: houshengbo, matzew

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