Backport #6528 [CA] Fix expectedToRegister to respect instances with nil status into CA1.29

[Shubham82]

What type of PR is this?

/kind bug

What this PR does / why we need it:

This PR is cherry-picked, which backports #6528 into CA 1.28

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

None

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[Shubham82]

Hi @feiskyer, @x13n
PTAL!

[x13n]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Shubham82, x13n

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[agamez-harmonicinc]

Is this fix available for all 1.29 versions? I've faced this problem is CA 1.29.3 a couple of days ago.

[Shubham82]

Hi @agamez-harmonicinc No, this fix is available in the CA v1.29.4 version for v1.29
Please take a look at this:
https://github.com/kubernetes/autoscaler/releases/tag/cluster-autoscaler-1.29.4

[agamez-harmonicinc]

Thanks a lot @Shubham82 , appreciate the quick response

[Shubham82]

Thanks a lot @Shubham82 , appreciate the quick response

You're Welcome!