When monitoring a Web site, you need to look at it both from a 'micro' perspective (i.e. are the individual devices and servers in your infrastructure running smoothly?) and from a 'macro' perspective (i.e. do your customers have a pleasant experience when accessing and using your site?; can they use your site's functionality to conduct their business online?). You can also think about these types of monitoring as 'engineering' monitoring vs. 'business' monitoring.
Read the full thing at http://agiletesting.blogspot.com/2010/02/web-site-monitoring-techniques-and.html
Linked for a mention of Cacti :)
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