Salut Mihai,
any decent monitoring tool should be able to achieve what you need:
PRTG(btw. they just released an alpha linux probe)100 Sensors free
Zabbix
If
you don't want/need the overhead of such an tool you can just build a
ba(sh) or python parsing script that does some snmpwalk or ssh 'expect'
commands and in the end send email or curl post. ;)
Beste Grüsse, Regards si s-auzim de bine
Florin Sfetea