VMware Aria Operations displays inconsistent custom attributes for Virtual Machines. Some Virtual Machines show all available custom attributes, including those with null values, whereas other Virtual Machines only display custom attributes explicitly assigned to them. Additionally, custom attributes removed from the source vCenter Server continue to appear in Aria Operations.
VMware Aria Operations 8.18.x
This is expected behavior. Aria Operations retains custom attributes and their last known values for historical tracking purposes until the parent Virtual Machine object is permanently deleted from the Aria Operations inventory.
No configuration changes are necessary as the system is operating as designed.