monitor will print the received events for:
UDEV - the event which udev sends out after rule processing

UDEV  [1281101367.824924] add      /devices/pci0000:00/0000:00:1d.7/usb1/1-8 (usb)
UDEV_LOG=3
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:1d.7/usb1/1-8
SUBSYSTEM=usb
DEVNAME=/dev/bus/usb/001/012
DEVTYPE=usb_device
PRODUCT=781/5406/200
TYPE=0/0/0
BUSNUM=001
DEVNUM=012
SEQNUM=1540
ID_VENDOR=SanDisk
ID_VENDOR_ENC=SanDisk
ID_VENDOR_ID=0781
ID_MODEL=U3_Cruzer_Micro
ID_MODEL_ENC=U3\x20Cruzer\x20Micro
ID_MODEL_ID=5406
ID_REVISION=0200
ID_SERIAL=SanDisk_U3_Cruzer_Micro_290680141E92D4C4
ID_SERIAL_SHORT=290680141E92D4C4
ID_BUS=usb
ID_USB_INTERFACES=:080650:
MAJOR=189
MINOR=11
DEVLINKS=/dev/char/189:11

UDEV  [1281101367.827626] add      /devices/pci0000:00/0000:00:1d.7/usb1/1-8/1-8:1.0 (usb)
UDEV_LOG=3
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:1d.7/usb1/1-8/1-8:1.0
SUBSYSTEM=usb
DEVTYPE=usb_interface
PRODUCT=781/5406/200
TYPE=0/0/0
INTERFACE=8/6/80
MODALIAS=usb:v0781p5406d0200dc00dsc00dp00ic08isc06ip50
SEQNUM=1541

UDEV  [1281101367.829957] add      /devices/pci0000:00/0000:00:1d.7/usb1/1-8/1-8:1.0/host10 (scsi)
UDEV_LOG=3
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:1d.7/usb1/1-8/1-8:1.0/host10
SUBSYSTEM=scsi
DEVTYPE=scsi_host
SEQNUM=1542

UDEV  [1281101367.832075] add      /devices/pci0000:00/0000:00:1d.7/usb1/1-8/1-8:1.0/host10/scsi_host/host10 (scsi_host)
UDEV_LOG=3
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:1d.7/usb1/1-8/1-8:1.0/host10/scsi_host/host10
SUBSYSTEM=scsi_host
SEQNUM=1543