cluster performance degradation

I created a 3-node cluster with ceph and HA, all three nodes have an Enterprise license, I created about 10 VMs spread across the three nodes, for the first week the VMs were running very well with excellent performance, now for a few days there has been a huge degradation in performance, in the resource info I see everything normal both as CPU and RAM, and I can't understand why this degradation, I understood that the problem is ceph, because if I migrate a VM to a local disk the VM runs...

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