What happened:
When Kupid mutates Affinity rules for a resource which originally has no affinity rules then that mutation is not logged. This is required for better diagnostics

What you expected to happen:
All mutations (if any) done by kupid to a resource for node affinity changes should be logged.

How to reproduce it (as minimally and precisely as possible):
Create a new STS and ensure that it is a target for kupid to inject affinity rules. You will see that kupid injects the rules as defined in ClusterPodSchedulingPolicy resource but it will not log the mutation for the first change.