[Beginner] Problem viewing hosts available with ICMP

[Xenomorphalien]

Hello,

I'm new to Zabbix, so my question will probably seem trivial to many people :/

I used the ICMP module (Ping) to check the availability of some equipment (Router, Switch, etc...).

I have tested on 2 hosts currently, one answering, the other not.

I have an alert for the unavailable host (perfect) and no alert for the other (which is normal)

However, when I look at the home page, I am curious to see 1 available Host (Zabbix), and two others (my equipment verified by ICMP) in the Unknow category (see the screen)

What do I have to do to keep it up to date?

Besides, do you have any good addresses for up-to-date Tutorials?

Thank you in advance,

Sincerely,

Thomas C.

Translated with www.DeepL.com/Translator

[Hamardaban]

Best tutorial-documentation: https://www.zabbix.com/documentation/4.4/start . You are looking at a picture showing the status of AGENTS and SNMP checks, which is not related to ICMP checks.