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?