Why does RHEV randomly not show any utilization and IP statistics for some VMs? - Red Hat Customer Portal

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Issue

Hypervisors suddenly fail to monitor the rhev-agent status from all virtual machines running on them.
Cannot see Memory Usage of the Virtual Machine or the IP Address of the Virtual Machine from the RHEVM.
The issue is fixed by restarting the Hypervisor or by migrating the virtual machines to another hypervisor.
Why are VM IP addresses are not shown in RHEV, even thought the guest agent is installed ?
The "Enable WAN Options" checkbox on the Spice Console Options screen is no longer visible? What happened?

Environment

Red Hat Enterprise Virtualization (RHEV) 3.1
Host: vdsm-4.10.2-1.9 and earlier
Guest: RHEV Agent from RHEV Tools

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