Here's an example from QMP_requests_and_replies_from_libvirtd.log.gz attached earlier to the bug by Kashyap. We can see two device_del commands prior to only seeing a single event emitted by QEMU:

http://paste.openstack.org/show/798607/

# zgrep 0x7f768806eaf0 QMP_requests_and_replies_from_libvirtd.log.gz | egrep '(device_del|DEVICE_DELETED)'
2020-09-07 19:50:11.315+0000: 65558: info : qemuMonitorSend:993 : QEMU_MONITOR_SEND_MSG: mon=0x7f768806eaf0 msg={"execute":"device_del","arguments":{"id":"virtio-disk1"},"id":"libvirt-367"}
2020-09-07 19:50:17.535+0000: 65557: info : qemuMonitorSend:993 : QEMU_MONITOR_SEND_MSG: mon=0x7f768806eaf0 msg={"execute":"device_del","arguments":{"id":"virtio-disk1"},"id":"libvirt-369"}
2020-09-07 19:50:18.138+0000: 65555: info : qemuMonitorJSONIOProcessLine:234 : QEMU_MONITOR_RECV_EVENT: mon=0x7f768806eaf0 event={"timestamp": {"seconds": 1599508218, "microseconds": 138046}, "event": "DEVICE_DELETED", "data": {"path": "/machine/peripheral/virtio-disk1/virtio-backend"}}
2020-09-07 19:50:24.549+0000: 65556: info : qemuMonitorSend:993 : QEMU_MONITOR_SEND_MSG: mon=0x7f768806eaf0 msg={"execute":"device_del","arguments":{"id":"virtio-disk1"},"id":"libvirt-371"}
2020-09-07 19:50:33.561+0000: 65556: info : qemuMonitorSend:993 : QEMU_MONITOR_SEND_MSG: mon=0x7f768806eaf0 msg={"execute":"device_del","arguments":{"id":"virtio-disk1"},"id":"libvirt-373"}
2020-09-07 19:50:44.572+0000: 65557: info : qemuMonitorSend:993 : QEMU_MONITOR_SEND_MSG: mon=0x7f768806eaf0 msg={"execute":"device_del","arguments":{"id":"virtio-disk1"},"id":"libvirt-375"}
2020-09-07 19:50:57.583+0000: 65558: info : qemuMonitorSend:993 : QEMU_MONITOR_SEND_MSG: mon=0x7f768806eaf0 msg={"execute":"device_del","arguments":{"id":"virtio-disk1"},"id":"libvirt-377"}
2020-09-07 19:51:12.595+0000: 65556: info : qemuMonitorSend:993 : QEMU_MONITOR_SEND_MSG: mon=0x7f768806eaf0 msg={"execute":"device_del","arguments":{"id":"virtio-disk1"},"id":"libvirt-379"}
2020-09-07 19:51:30.548+0000: 65557: info : qemuMonitorSend:993 : QEMU_MONITOR_SEND_MSG: mon=0x7f768806eaf0 msg={"execute":"device_del","arguments":{"id":"virtio-disk1"},"id":"libvirt-381"}
2020-09-07 19:51:51.804+0000: 65559: info : qemuMonitorSend:993 : QEMU_MONITOR_SEND_MSG: mon=0x7f768806eaf0 msg={"execute":"device_del","arguments":{"id":"virtio-disk1"},"id":"libvirt-383"}
2020-09-07 19:53:33.286+0000: 65559: info : qemuMonitorSend:993 : QEMU_MONITOR_SEND_MSG: mon=0x7f768806eaf0 msg={"execute":"device_del","arguments":{"id":"virtio-disk1"},"id":"libvirt-385"}
2020-09-07 19:53:40.310+0000: 65558: info : qemuMonitorSend:993 : QEMU_MONITOR_SEND_MSG: mon=0x7f768806eaf0 msg={"execute":"device_del","arguments":{"id":"virtio-disk1"},"id":"libvirt-387"}
2020-09-07 19:53:49.353+0000: 65556: info : qemuMonitorSend:993 : QEMU_MONITOR_SEND_MSG: mon=0x7f768806eaf0 msg={"execute":"device_del","arguments":{"id":"virtio-disk1"},"id":"libvirt-389"}
2020-09-07 19:54:00.771+0000: 65560: info : qemuMonitorSend:993 : QEMU_MONITOR_SEND_MSG: mon=0x7f768806eaf0 msg={"execute":"device_del","arguments":{"id":"virtio-disk1"},"id":"libvirt-391"}
2020-09-07 19:54:15.737+0000: 65559: info : qemuMonitorSend:993 : QEMU_MONITOR_SEND_MSG: mon=0x7f768806eaf0 msg={"execute":"device_del","arguments":{"id":"virtio-disk1"},"id":"libvirt-393"}
2020-09-07 19:54:30.767+0000: 65557: info : qemuMonitorSend:993 : QEMU_MONITOR_SEND_MSG: mon=0x7f768806eaf0 msg={"execute":"device_del","arguments":{"id":"virtio-disk1"},"id":"libvirt-395"}
2020-09-07 19:54:47.778+0000: 65560: info : qemuMonitorSend:993 : QEMU_MONITOR_SEND_MSG: mon=0x7f768806eaf0 msg={"execute":"device_del","arguments":{"id":"virtio-disk1"},"id":"libvirt-397"}
2020-09-07 19:55:06.793+0000: 65559: info : qemuMonitorSend:993 : QEMU_MONITOR_SEND_MSG: mon=0x7f768806eaf0 msg={"execute":"device_del","arguments":{"id":"virtio-disk1"},"id":"libvirt-399"}