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

KERNEL[121.790561] add      /module/parport (module)
ACTION=add
DEVPATH=/module/parport
SEQNUM=1465
SUBSYSTEM=module
UDEV_LOG=3

UDEV  [121.790758] add      /module/parport (module)
ACTION=add
DEVPATH=/module/parport
SEQNUM=1465
SUBSYSTEM=module
UDEV_LOG=3
USEC_INITIALIZED=121790713

KERNEL[121.815005] add      /module/lp (module)
ACTION=add
DEVPATH=/module/lp
SEQNUM=1466
SUBSYSTEM=module
UDEV_LOG=3

KERNEL[121.815040] add      /class/printer (class)
ACTION=add
DEVPATH=/class/printer
SEQNUM=1467
SUBSYSTEM=class
UDEV_LOG=3

UDEV  [121.815196] add      /class/printer (class)
ACTION=add
DEVPATH=/class/printer
SEQNUM=1467
SUBSYSTEM=class
UDEV_LOG=3
USEC_INITIALIZED=121815161