Comment 7 for bug 1194076

This isn't a bug, if you look at this https://github.com/openstack/nova/blob/master/nova/compute/stats.py#L52
the workload is being computed by the number of tasks in progress. In your case, I believe that once you suspend and show the hypervisor stats the VM is still suspending, but when you resume, by the time you show hypervisor stats the task is no longer a task in progress, thats why you see 0.