How can I delete a Hypervisor I no longer wish to have on my cloud so I am no longer charged for these cores?
All OnApp Versions
To remove an old hypervisor you can go to http://xxx.xxx.xxx.xxx/settings/hypervisors and there you can simply press the delete button and it will remove the HV after a short confirmation message.
You will need to make sure that all virtual machines are moved off of the HV.
If it does not delete, you may also need to remove data stores and networks from the HV through Settings->Hypervisors