collectd exec script to collect zpool capacity information

zpool_capacity.sh

#!/bin/bash

HOSTNAME="${COLLECTD_HOSTNAME:-localhost}"
INTERVAL="${COLLECTD_INTERVAL:-60}"

while sleep "$INTERVAL"; do
        VALUE="$(zpool list -Ho capacity)"
        VALUE="$(echo "${VALUE: :-1}")"
        echo "PUTVAL $HOSTNAME/zpool_capacity/percent interval=$INTERVAL N:$VALUE"
done