It seems I cannot delete a host from Foreman when it's been provisioned on VMware and no longer exists in the VMware stack. I get a message about failing to destroy and "ActiveRecord::RecordNotFound." I think it would be great if you allowed removal of hosts when this occurs. Obviously if the host does not exist in VMware it's no longer needed in Foreman. This could be a bug, but it's most likely a feature request.