Feat/published service selector

[justin0u0]

What does this PR do?

Introduce the --publishedserviceselector option to select and publish IPs from multiple services.

Motivation

Closes #11617.

More

• Added/updated tests
• Added/updated documentation

Additional Notes

[justin0u0]

Hi @kevinpollet,

The test failed, but it is not related to my changes and seems like a flaky one.

Could you re-run the tests and take a look at this pull request?

Thanks!

[kevinpollet]

Hello @justin0u0, I restarted the tests.

[justin0u0]

Hello @justin0u0, I restarted the tests.

Hi @kevinpollet, didn't notice that the new test added was flaky.

I've fixed it, please rerun the test and take a look, thanks!

[justin0u0]

@kevinpollet, sorry for the failed test again.

The TestIngressEndpointPublishedService test originally used assert.Equal to match ingress status. However, ASAIK, GetNodes() can return an arbitrary order of nodes, which sometimes caused the test to failed.

So I changed assert.Equal to assert.ElementsMatch under TestIngressEndpointPublishedService in 2615342.

I'm also wondering why the TestIngressEndpointPublishedService hadn't failed before?

[kevinpollet]

Hello @justin0u0,

I'm also wondering why the TestIngressEndpointPublishedService hadn't failed before?

You are right, I think this test fails occasionally.
If you want, you can fix it too in this pull request.

[justin0u0]

Hello @justin0u0,

I'm also wondering why the TestIngressEndpointPublishedService hadn't failed before?

You are right, I think this test fails occasionally. If you want, you can fix it too in this pull request.

Hi @kevinpollet , I already did fixed TestIngressEndpointPublishedService with 153db46.

The latest test failure is not related to this pull request, please take a look 🙏