$ sudo dmesg | grep -i udev
...<snip>...
[  355.780264] udevd[659]: Validate module index
[  355.780607] udevd[659]: seq 4158 queued, 'add' 'usb'
[  355.781220] udevd[659]: seq 4158 forked new worker [2436]
[  355.782401] udevd[2436]: seq 4158 running
[  355.782729] udevd[2436]: no db file to read /run/udev/data/c189:257: No such file or directory
[  355.782856] udevd[2436]: IMPORT builtin 'usb_id' /lib/udev/rules.d/40-libgphoto2.rules:9
[  355.783937] udevd[659]: seq 4159 queued, 'add' 'usb'
[  355.784125] udevd[659]: seq 4160 queued, 'bind' 'usb'
[  355.784754] udevd[2436]: IMPORT builtin skip 'usb_id' /lib/udev/rules.d/50-udev-default.rules:13
[  355.784765] udevd[2436]: IMPORT builtin 'hwdb' /lib/udev/rules.d/50-udev-default.rules:13
[  365.648261] udevd[659]: Validate module index
[  365.648410] udevd[659]: seq 4178 queued, 'remove' 'bsg'
[  365.648901] udevd[659]: seq 4178 forked new worker [2454]
[  365.649301] udevd[659]: seq 4179 queued, 'remove' 'scsi_device'
[  365.649724] udevd[659]: seq 4179 forked new worker [2455]
[  365.649941] udevd[659]: seq 4180 queued, 'remove' 'scsi_disk'
[  365.649951] udevd[2454]: seq 4178 running
[  365.650385] udevd[659]: seq 4180 forked new worker [2456]
[  365.651134] udevd[2455]: seq 4179 running
[  365.651236] udevd[2455]: no db file to read /run/udev/data/+scsi_device:5:0:0:0: No such file or directory

$ udevadm monitor
monitor will print the received events for:                                                                                            
UDEV - the event which udev sends out after rule processing                                                                            
KERNEL - the kernel uevent                                                                                                             
                                                                                                                                       
KERNEL[355.829048] add      /devices/pci0000:00/0000:00:14.0/usb3/3-2 (usb)                                                            
KERNEL[355.832118] add      /devices/pci0000:00/0000:00:14.0/usb3/3-2/3-2:1.0 (usb)                                                    
KERNEL[355.832388] bind     /devices/pci0000:00/0000:00:14.0/usb3/3-2 (usb)                                                            
KERNEL[355.919912] add      /module/usb_storage (module)                                                                               
KERNEL[355.921133] add      /devices/pci0000:00/0000:00:14.0/usb3/3-2/3-2:1.0/host5 (scsi)                                             
KERNEL[355.921180] add      /devices/pci0000:00/0000:00:14.0/usb3/3-2/3-2:1.0/host5/scsi_host/host5 (scsi_host)                        
KERNEL[355.922414] bind     /devices/pci0000:00/0000:00:14.0/usb3/3-2/3-2:1.0 (usb)
KERNEL[355.922461] add      /bus/usb/drivers/usb-storage (drivers)                                                                     
KERNEL[355.933664] add      /module/uas (module)                                                                                       
KERNEL[355.933968] add      /bus/usb/drivers/uas (drivers)                                                                             
KERNEL[357.206092] add      /devices/pci0000:00/0000:00:14.0/usb3/3-2/3-2:1.0/host5/target5:0:0 (scsi)
KERNEL[357.206156] add      /devices/pci0000:00/0000:00:14.0/usb3/3-2/3-2:1.0/host5/target5:0:0/5:0:0:0 (scsi)
KERNEL[357.206183] add      /devices/pci0000:00/0000:00:14.0/usb3/3-2/3-2:1.0/host5/target5:0:0/5:0:0:0/scsi_device/5:0:0:0 (scsi_device)                               
KERNEL[357.206933] add      /devices/pci0000:00/0000:00:14.0/usb3/3-2/3-2:1.0/host5/target5:0:0/5:0:0:0/scsi_disk/5:0:0:0 (scsi_disk)
KERNEL[357.207906] add      /devices/pci0000:00/0000:00:14.0/usb3/3-2/3-2:1.0/host5/target5:0:0/5:0:0:0/bsg/5:0:0:0 (bsg)
KERNEL[357.215925] add      /devices/virtual/bdi/8:32 (bdi)                                                                            
KERNEL[357.220995] add      /devices/pci0000:00/0000:00:14.0/usb3/3-2/3-2:1.0/host5/target5:0:0/5:0:0:0/block/sdc (block)
KERNEL[357.221049] add      /devices/pci0000:00/0000:00:14.0/usb3/3-2/3-2:1.0/host5/target5:0:0/5:0:0:0/block/sdc/sdc1 (block)
KERNEL[357.221078] add      /devices/pci0000:00/0000:00:14.0/usb3/3-2/3-2:1.0/host5/target5:0:0/5:0:0:0/block/sdc/sdc2 (block)
KERNEL[357.223736] bind     /devices/pci0000:00/0000:00:14.0/usb3/3-2/3-2:1.0/host5/target5:0:0/5:0:0:0 (scsi)
KERNEL[365.696363] remove   /devices/pci0000:00/0000:00:14.0/usb3/3-2/3-2:1.0/host5/target5:0:0/5:0:0:0/bsg/5:0:0:0 (bsg)
KERNEL[365.696523] remove   /devices/pci0000:00/0000:00:14.0/usb3/3-2/3-2:1.0/host5/target5:0:0/5:0:0:0/scsi_device/5:0:0:0 (scsi_device)                               
KERNEL[365.696989] remove   /devices/pci0000:00/0000:00:14.0/usb3/3-2/3-2:1.0/host5/target5:0:0/5:0:0:0/scsi_disk/5:0:0:0 (scsi_disk)
KERNEL[365.703826] change   /devices/pci0000:00/0000:00:14.0/usb3/3-2/3-2:1.0/host5/target5:0:0/5:0:0:0/block/sdc (block)
KERNEL[365.704161] remove   /devices/pci0000:00/0000:00:14.0/usb3/3-2/3-2:1.0/host5/target5:0:0/5:0:0:0/block/sdc/sdc2 (block)
KERNEL[365.704284] remove   /devices/pci0000:00/0000:00:14.0/usb3/3-2/3-2:1.0/host5/target5:0:0/5:0:0:0/block/sdc/sdc1 (block)
KERNEL[365.704740] remove   /devices/virtual/bdi/8:32 (bdi)
KERNEL[365.704873] remove   /devices/pci0000:00/0000:00:14.0/usb3/3-2/3-2:1.0/host5/target5:0:0/5:0:0:0/block/sdc (block)
KERNEL[365.712037] unbind   /devices/pci0000:00/0000:00:14.0/usb3/3-2/3-2:1.0/host5/target5:0:0/5:0:0:0 (scsi)
KERNEL[365.712094] remove   /devices/pci0000:00/0000:00:14.0/usb3/3-2/3-2:1.0/host5/target5:0:0/5:0:0:0 (scsi)
KERNEL[365.728351] remove   /devices/pci0000:00/0000:00:14.0/usb3/3-2/3-2:1.0/host5/target5:0:0 (scsi)
KERNEL[365.728419] remove   /devices/pci0000:00/0000:00:14.0/usb3/3-2/3-2:1.0/host5/scsi_host/host5 (scsi_host)
KERNEL[365.728446] remove   /devices/pci0000:00/0000:00:14.0/usb3/3-2/3-2:1.0/host5 (scsi)
KERNEL[365.737169] unbind   /devices/pci0000:00/0000:00:14.0/usb3/3-2/3-2:1.0 (usb)
KERNEL[365.737264] remove   /devices/pci0000:00/0000:00:14.0/usb3/3-2/3-2:1.0 (usb)
KERNEL[365.737881] unbind   /devices/pci0000:00/0000:00:14.0/usb3/3-2 (usb)
KERNEL[365.737940] remove   /devices/pci0000:00/0000:00:14.0/usb3/3-2 (usb)

$ lsblk | grep sdc
sdc      8:32   1  14.5G  0 disk 
|-sdc1   8:33   1     4G  0 part
`-sdc2   8:34   1  10.5G  0 part