DNM: log first IPv6 CIDR association entry for debugging

[jechen0648]

Summary

This is a Do Not Merge experimental PR for diagnostic purposes only.

Adds a temporary klog.Infof in getSubnet to log the first entry in Ipv6CidrBlockAssociationSet (CIDR value and its state) before the existing code uses it. This allows us to observe whether the old code was picking a stale disassociated entry — answering the reviewer question on #228 about what the incorrect subnet value actually was.

How to use

Deploy this build on a dualstack cluster whose subnet has a stale IPv6 CIDR association, then check the CNCC pod logs:

oc logs -n openshift-cloud-network-config-controller \
  deployment/cloud-network-config-controller -f | grep getSubnet

Expected output (on affected cluster):

getSubnet: subnet subnet-0abc123 first IPv6 CIDR association: cidr=<stale-cidr>/64 state=disassociated

Related

• OCPBUGS-87249: on AWS, select associated IPv6 CIDR block for egress IP subnet #228

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This pull-request has been approved by: jechen0648
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