After AM Agent was installed on Linux machine, the inventory is shown correctly but the IP is missing.
Here is an example of how the inventory detail and structure is shown correctly:
And here is shown that only the IP is missing:
Client Automation 14 SP2 and SP3
On the above example, the Linux release is Red Hat Enterprise Linux 7.6, but this may happen on different Linux releases.
Newer versions of Linux come without "net-tools" installed, which is used by AM Agent to run some commands to collect local inventory.