zabbix-plugins/plugins/client/nginx/conf/nginx.conf

UserParameter=nginx.active,/etc/zabbix/scripts/nginx-status -u http://localhost/nginx_status -i active
UserParameter=nginx.accepted,/etc/zabbix/scripts/nginx-status -u http://localhost/nginx_status -i accepted
UserParameter=nginx.handled,/etc/zabbix/scripts/nginx-status -u http://localhost/nginx_status -i handled
UserParameter=nginx.requests,/etc/zabbix/scripts/nginx-status -u http://localhost/nginx_status -i requests
UserParameter=nginx.reading,/etc/zabbix/scripts/nginx-status -u http://localhost/nginx_status -i reading
UserParameter=nginx.writing,/etc/zabbix/scripts/nginx-status -u http://localhost/nginx_status -i writing
UserParameter=nginx.waiting,/etc/zabbix/scripts/nginx-status -u http://localhost/nginx_status -i waiting