[Robustness test] Implement RunWatchLoop for kubernetes traffic (part 3)

[henrybear327]

Implement RunWatchLoop in Kubernetes traffic.

Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.

[k8s-ci-robot]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.44%. Comparing base (142c534) to head (4e2e557).

Additional details and impacted files

see 18 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #21076      +/-   ##
==========================================
- Coverage   68.46%   68.44%   -0.03%     
==========================================
  Files         429      429              
  Lines       35242    35242              
==========================================
- Hits        24130    24120      -10     
- Misses       9723     9735      +12     
+ Partials     1389     1387       -2     

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[henrybear327]

Moving it out of the draft state to fix the CI error. Will ping @serathius when the PR is ready for a review pass!

[serathius]

Please fix tests

[henrybear327]

/retest

[serathius]

Does this need to depend on #21139 ?

[henrybear327]

Does this need to depend on #21139 ?

actually yes, because of the RunWatchLoop would need to use the WaitGroup field, too. Please see https://github.com/etcd-io/etcd/pull/21076/changes#diff-d4d457da0a9114653db44aafe71d7888c5b0f7b7fce4a5d146c48783e14dc1bcR152

[k8s-ci-robot]

@henrybear327: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-etcd-robustness-amd64	4e2e557	link	true	/test pull-etcd-robustness-amd64
pull-etcd-robustness-arm64	4e2e557	link	true	/test pull-etcd-robustness-arm64

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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