All the check categories we explored before cover a very wide range of possible devices, but there's always one which doesn't play well with standard monitoring protocols, can't have agent installed and is buggy in general. A real life example would be UPS that provides temperature information on the web interface, but does not provide this data over SNMP.
For our test we could choose something to query on the local machine—like whether machine has a 64-bit CPU or not. On Linux machines this information can be discovered by looking at
/proc/cpuinfo contents. On the Zabbix server, execute:
$ cat /proc/cpuinfo
This will produce detailed information on all processors installed.
As we can see, this is a fairly old Pentium CPU, which ...