arcstat parameters are not populated with data

Latest data in Zabbix show the red flag on arcstat metrics with the following error `Value "c_max 4 16636397568" of type "string" is not suitable for value type "Numeric (unsigned)"`
I tried to change the userparameter zfs.arcstats[*] command to `awk '/^$1/ {printf $3;}' /proc/spl/kstat/zfs/arcstats` because it produces a nice number when run from shell - but the problem did go away 

 