Question 1:
Add/update new node/pv/pvc/service will cause the change to predicates, which may make pending pods schedulable.
Question 2:
when a bound pod is added, creation of this pod may make pending pods with matching affinity terms schedulable.
when a bound pod is updated, change of labels may make pending pods with matching affinity terms schedulable.
when a bound pod is deleted, MatchInterPodAffinity need to be reconsidered for this node, as well as all nodes in its same failure domain.
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