FreeBSD(FreeNAS) support? about zabbix-disk-performance HOT 1 OPEN

Using version without python, in the following line ...

UserParameter=custom.vfs.dev.discovery,DEVS=grep -E -v 'fd|loop|ram|sr|major|^$|dm-' /proc/partitions | awk '{if($2==0||($2%8==0))print $4}'|sed 's/\//\!/g';POSITION=1;echo "{";echo " "data":[";for DEV in $DEVS;do if [ $POSITION -gt 1 ];then echo -n ",";fi;echo -n " { "{#DEVICENAME}": "$DEV"}";POSITION=expr $POSITION + 1;done;echo "";echo " ]";echo "}"

... i try to change '/proc/partitions' with 'gpart show -p' but is much complex to me make it work ;(

from zabbix-disk-performance.