- monitoring software

[Paolo De Michele <paolo@xxxxxxxxxxxxxxxxx>]

hi,

I have a dedicated server with several services running: ssh, ftp, httpd 
(with several sites andactive domains), the mail server (dovecot, 
postfix), dns.

I'd like to monitor all of these services in a graphical, easy, setting 
of thresholds and alerts via email.
I would also like that if a customer wanted to see the graphs I could 
create codes read-only.

there is one or more software that are right for me?
what advice can you give me?
thanks in advance

greetings
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