Hi developers,
I have questions about balloon-change or control-error event:
1. What's the meaning of these events
2. When do the events occur?
The comments of their callbacks don't mention that(https://gitlab.com/libvirt/libvirt/-/blob/master/include/libvirt/libvirt-domain.h#L4130 https://gitlab.com/libvirt/libvirt/-/blob/master/include/libvirt/libvirt-domain.h#L3736)
