Error to obtain OS details from hosts

[swordfish77]

Hello guys, new here, try to figure out which monitoring system is good for me, Zabbix vs Checkmk. Until Zabbix was a winner but I encountered a problem and I cannot find a solid solution no matter how much searching about. How can I solve this?
P.S. - I read on other sites that someone use it a line (zabbix ALL=(ALL) NOPASSWD: ALL) but seems that is not ok because results in a security flaw.
BIG thank you!

[cyber]

That is an eroor message from sudo on the pic... I guess the required sudo command is not configured on the server/proxy, where this command is executed....

sudo /usr/bin/nmap -O {HOST.CONN}

So you need to configure sudo for user zabbix, with no passwd asked, so it can execute that command as root (nmap requires it, I think) ({HOST.CONN} will be replaced with that hosts IP or name, whichever is marked as "connect to" in hosts config). And of course, make sure you have nmap installed ..

(zabbix ALL=(ALL) NOPASSWD: ALL) is definitely not the way to go..