RandomChoice 2 policy wasn't random when the number of targets is 2 (with equal weight)

[dprotaso]

Fixes: #14011
Fixes: #12593

Proposed Changes

• Activator Random Choice 2 Policy will now pick randomly between two targets that have equal weight

Release Note

Fix activator load balancing when using unbounded concurrency and when you have two instances of a revision

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.02 🎉

Comparison is base (6020cec) 86.21% compared to head (b4fb149) 86.23%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #14028      +/-   ##
==========================================
+ Coverage   86.21%   86.23%   +0.02%     
==========================================
  Files         199      199              
  Lines       14759    14767       +8     
==========================================
+ Hits        12724    12734      +10     
+ Misses       1733     1731       -2     
  Partials      302      302              

Impacted Files	Coverage Δ
pkg/activator/net/lb_policy.go	96.72% <100.00%> (+0.23%)	⬆️

... and 3 files with indirect coverage changes

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[ReToCode]

Nice find!

/lgtm

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[ReToCode]

/retest

[dprotaso]

/cherry-pick release-1.10
/cherry-pick release-1.9

[knative-prow-robot]

@dprotaso: new pull request created: #14052

In response to this:

/cherry-pick release-1.10
/cherry-pick release-1.9

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[dprotaso]

/cherry-pick release-1.9

[knative-prow-robot]

@dprotaso: new pull request created: #14053

In response to this:

/cherry-pick release-1.9

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.