dmesg

Provides vital information that can be used for troubleshooting production performance problems.

dmesg command prints all the kernel-related log messages in the console. It includes messages related to the device driver, OS patching, memory, disk drives, network, etc.

Verbosity

dmesg --level=emerg,alert,crit,err,warn,notice,info,debug

To output the verbosity level and the facility (kernel, user, etc.):

dmesg -x

Human-Readable Timestamp

dmesg -T