if we use system.run in key of item or dicovery rule, the key does not fit in field
see screen of my modification
in zabbix 5.0.1 all the same
i use sed in zabbix 4 gui to replace CTextBox to CTextArea in
include/views/configuration.item.edit.php
include/views/configuration.item.prototype.edit.php
include/views/configuration.host.discovery.edit.php

#include/views/configuration.item.edit.php +64
#test for 4.4 CTextArea to CTextAreaFlexible
conitemid=`grep -n "new CTextBox('key', $this" $zabbix30dir/include/views/configuration.item.edit.php |perl -e 'while(<>)

{ m/(\d+).+?(\w+)/;print "$1\n"; }'`
sed -i "$conitemid s/CTextBox/CTextArea/g" $zabbix30dir/include/views/configuration.item.edit.php

#include/views/configuration.item.prototype.edit.php
conitemprotid=`grep -n "new CTextBox('key', $this" $zabbix30dir/include/views/configuration.item.prototype.edit.php |perl -e 'while(<>) { m/(d+).+?(w+)/;print "$1n"; }

'`
sed -i "$conitemprotid s/CTextBox/CTextArea/g" $zabbix30dir/include/views/configuration.item.prototype.edit.php

#include/views/configuration.host.discovery.edit.php
conhostdisid=`grep -n "new CTextBox('key', $this" $zabbix30dir/include/views/configuration.host.discovery.edit.php |perl -e 'while(<>)

{ m/(\d+).+?(\w+)/;print "$1\n"; }

'`
sed -i "$conhostdisid s/CTextBox/CTextArea/g" $zabbix30dir/include/views/configuration.host.discovery.edit.php

please add it native