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On K8s upgrades, the new and old nodes are part of a cluster until the new nodes become ready.
There is a race condition where the IP is the same, which confuses the API server and prevents the old nodes from being cleaned up.
We are sure that this won't happen if we prevent the use of an already released IP immediately.
Using released IPs will be possible after some Delays like 5m
Anything else you would like to add:
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/kind feature