template: isc_dhcpd_leases_size
      on: isc_dhcpd.leases_total
   units: KB
   every: 60
    calc: $leases_size
    warn: $this > 3072
    crit: $this > 6144
   delay: up 2m down 5m
    info: dhcpd.leases file too big! Module can slow down your server.
      to: sysadmin