add learner check to readyz

[gojoy]

Backport #19086
Fix #19001

[k8s-ci-robot]

Hi @gojoy. Thanks for your PR.

I'm waiting for a etcd-io 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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[gojoy]

/retest-required

[k8s-ci-robot]

@gojoy: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/retest-required

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[gojoy]

@ahrtr Hi .This request need /ok-to-test.Thanks

[ahrtr]

/ok-to-test

[gojoy]

/retest-required

[gojoy]

/retest-required

[gojoy]

@k8s-ci-robot /retest-required

[gojoy]

/ok-to-test

I can't trigger retest-required. Can you help me, Thanks @ahrtr

[ahrtr]

/retest

[siyuanfoundation]

/lgtm
Thanks @gojoy for backporting this!

[ahrtr]

We need to add a changelog itme as well. cc @gojoy @ivanvc

[ahrtr]

LGTM

THanks

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahrtr, gojoy, siyuanfoundation

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[ivanvc]

@gojoy, can you update the 3.5 CHANGELOG?

[gojoy]

@gojoy, can you update the 3.5 CHANGELOG?

OK.I'll finish this after my vacation.