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

KERNEL[318.618522] add      /module/usbmon (module)
KERNEL[318.618585] add      /class/usbmon (class)
UDEV  [318.619878] add      /module/usbmon (module)
UDEV  [318.619928] add      /class/usbmon (class)
KERNEL[318.620442] add      /devices/virtual/usbmon/usbmon0 (usbmon)
UDEV  [318.621453] add      /devices/virtual/usbmon/usbmon0 (usbmon)
KERNEL[318.621678] add      /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.0/usbmon/usbmon4 (usbmon)
KERNEL[318.621865] add      /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usbmon/usbmon3 (usbmon)
KERNEL[318.622025] add      /devices/pci0000:00/0000:00:1d.2/usbmon/usbmon2 (usbmon)
KERNEL[318.622649] add      /devices/pci0000:00/0000:00:1d.0/usbmon/usbmon1 (usbmon)
UDEV  [318.623990] add      /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.0/usbmon/usbmon4 (usbmon)
UDEV  [318.626398] add      /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usbmon/usbmon3 (usbmon)
UDEV  [318.627817] add      /devices/pci0000:00/0000:00:1d.0/usbmon/usbmon1 (usbmon)
UDEV  [318.628672] add      /devices/pci0000:00/0000:00:1d.2/usbmon/usbmon2 (usbmon)
KERNEL[500.163187] add      /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1 (usb)
KERNEL[500.165787] add      /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0 (usb)
UDEV  [500.176325] add      /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1 (usb)
KERNEL[500.263823] add      /module/usb_storage (module)
UDEV  [500.264667] add      /module/usb_storage (module)
KERNEL[500.266295] add      /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0/host2 (scsi)
UDEV  [500.266355] add      /bus/usb/drivers/usb-storage (drivers)
KERNEL[500.266397] add      /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0/host2/scsi_host/host2 (scsi_host)
KERNEL[500.266436] add      /bus/usb/drivers/usb-storage (drivers)
UDEV  [500.267150] add      /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0 (usb)
UDEV  [500.269590] add      /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0/host2 (scsi)
UDEV  [500.271395] add      /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0/host2/scsi_host/host2 (scsi_host)
KERNEL[501.266689] add      /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0/host2/target2:0:0 (scsi)
KERNEL[501.266748] add      /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0/host2/target2:0:0/2:0:0:0 (scsi)
KERNEL[501.266790] add      /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0/host2/target2:0:0/2:0:0:0/scsi_disk/2:0:0:0 (scsi_disk)
KERNEL[501.266829] add      /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0/host2/target2:0:0/2:0:0:0/scsi_device/2:0:0:0 (scsi_device)
KERNEL[501.267114] add      /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0/host2/target2:0:0/2:0:0:0/scsi_generic/sg2 (scsi_generic)
KERNEL[501.267263] add      /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0/host2/target2:0:0/2:0:0:0/bsg/2:0:0:0 (bsg)
UDEV  [501.278035] add      /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0/host2/target2:0:0 (scsi)
KERNEL[501.278389] add      /devices/virtual/bdi/8:16 (bdi)
UDEV  [501.284806] add      /devices/virtual/bdi/8:16 (bdi)
KERNEL[501.288251] add      /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0/host2/target2:0:0/2:0:0:0/block/sdb (block)
KERNEL[501.288312] add      /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0/host2/target2:0:0/2:0:0:0/block/sdb/sdb1 (block)
UDEV  [501.301922] add      /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0/host2/target2:0:0/2:0:0:0 (scsi)
UDEV  [501.306414] add      /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0/host2/target2:0:0/2:0:0:0/scsi_device/2:0:0:0 (scsi_device)
UDEV  [501.310034] add      /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0/host2/target2:0:0/2:0:0:0/scsi_disk/2:0:0:0 (scsi_disk)
UDEV  [501.318109] add      /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0/host2/target2:0:0/2:0:0:0/bsg/2:0:0:0 (bsg)
UDEV  [501.320784] add      /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0/host2/target2:0:0/2:0:0:0/scsi_generic/sg2 (scsi_generic)
UDEV  [501.525521] add      /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0/host2/target2:0:0/2:0:0:0/block/sdb (block)
UDEV  [501.701656] add      /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0/host2/target2:0:0/2:0:0:0/block/sdb/sdb1 (block)
KERNEL[525.615842] add      /module/fat (module)
UDEV  [525.616828] add      /module/fat (module)
KERNEL[525.618070] add      /module/vfat (module)
UDEV  [525.618896] add      /module/vfat (module)
KERNEL[525.639515] add      /module/nls_cp437 (module)
UDEV  [525.640399] add      /module/nls_cp437 (module)
KERNEL[525.644425] add      /module/nls_utf8 (module)
UDEV  [525.645242] add      /module/nls_utf8 (module)
KERNEL[593.294388] change   /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0/host2/target2:0:0/2:0:0:0/block/sdb (block)
UDEV  [593.314641] change   /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0/host2/target2:0:0/2:0:0:0/block/sdb (block)
KERNEL[615.811555] remove   /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0/host2/target2:0:0/2:0:0:0/bsg/2:0:0:0 (bsg)
UDEV  [615.813350] remove   /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0/host2/target2:0:0/2:0:0:0/bsg/2:0:0:0 (bsg)
KERNEL[615.813803] remove   /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0/host2/target2:0:0/2:0:0:0/scsi_generic/sg2 (scsi_generic)
KERNEL[615.813846] remove   /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0/host2/target2:0:0/2:0:0:0/scsi_device/2:0:0:0 (scsi_device)
KERNEL[615.813886] remove   /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0/host2/target2:0:0/2:0:0:0/scsi_disk/2:0:0:0 (scsi_disk)
KERNEL[615.814043] remove   /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0/host2/target2:0:0/2:0:0:0/block/sdb/sdb1 (block)
KERNEL[615.815757] remove   /devices/virtual/bdi/8:16 (bdi)
KERNEL[615.816354] remove   /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0/host2/target2:0:0/2:0:0:0/block/sdb (block)
KERNEL[615.816403] remove   /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0/host2/target2:0:0/2:0:0:0 (scsi)
KERNEL[615.816445] remove   /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0/host2/target2:0:0 (scsi)
KERNEL[615.816485] remove   /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0/host2/scsi_host/host2 (scsi_host)
KERNEL[615.816526] remove   /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0/host2 (scsi)
KERNEL[615.817497] remove   /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0 (usb)
KERNEL[615.817966] remove   /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1 (usb)
UDEV  [615.818598] remove   /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0/host2/target2:0:0/2:0:0:0/scsi_device/2:0:0:0 (scsi_device)
UDEV  [615.819097] remove   /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0/host2/target2:0:0/2:0:0:0/scsi_generic/sg2 (scsi_generic)
UDEV  [615.819683] remove   /devices/virtual/bdi/8:16 (bdi)
UDEV  [615.821529] remove   /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0/host2/scsi_host/host2 (scsi_host)
UDEV  [615.823541] remove   /devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/0000:03:00.1/usb3/3-1/3-1:1.0/host2/target2: