After upgrading to Aria Operations 8.18.4 or later, the Virtual Machine CPU Usage (%) Metric displays values exceeding 100%.
VMware Aria Operations 8.18
This is the expected behavior.
Starting with VMware Aria Operations 8.18.4, the CPU Usage (%) Metric is now displayed values greater than 100%.
Virtual Machine Metrics Doc for reference: Virtual Machine Metrics
CPU|Usage (%)