The system plugin gathers general stats on system load, uptime,
and number of users logged in. It is similar to the unix
Number of CPUs is obtained from the /proc/cpuinfo file.
# Read metrics about system load & uptime [[inputs.system]] # no configuration
n_users field requires read access to
/var/run/utmp, and may require
cua user to be added to the
utmp group on some systems. If this file does not exist
n_users will be skipped.