In an environment with VMs that are large, but often idle - but sometimes they have very high utilization, and then descheduler evict them from a node, because it becomes immediately inbalanced on the cluster.
The new node will also be immediately highly utilized (the old not anmore) leading to the an eviction of the same Vm from the new node as well.

Evictions continue while we do not achieve balance. It's actually impossible.
    

4.20
    

Always
    

    1. Single large Vm on a node
    2. idle vm
    3. make vm busy
    

VM will be continously moved from node to node to improving the balance.
    

VM will eventually not be moved anymore as the system sees that there is no balance gain.