Various Types of Protocol
Website monitoring service can check HTTP pages, HTTPS, FTP, SMTP, POP3, IMAP, DNS, SSH, Telnet, SSL, TCP, PING, Domain Name Expiry, SSL Certificate Expiry and a range of other ports with great variety of check intervals from every 4 hours to seconds. Typically, most website monitoring services test your server anywhere between once-per hour to once-per-minute.
Advanced services offer applications that capture browser interactions with websites, as well as in-browser web transaction monitoring tools based on browser addons such as Selenium or iMacros. These services test a website by remote controlling a large number of web browsers, thus they can also detect websites issues such a Javascript bugs that are browser specific.
Time performances: for example an HTTP page should answer in less than 1 second (for a download of 16Ko) to be considered as "good".
An implementation of time performance monitoring for the Apache HTTP Server is the mod_arm4 module.
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