Check manual page of arbor_pravail.disk_usage
Arbor Peakflow SP Memory and Swap
Monitors disk usage on Arbor Pravail devices. This
is based on a single percentage reported by the device,
this check doesn't know the absolute size of the disk.
This check can be configured using the rule
"Filesystems (used space and growth)" but only the
regular levels, specified in percent, are supported.
The sole item is named "/".
Exactly one service is discovered.