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Munin, the package that charts performance and usage metrics, does so at 5 min intervals by default. But its purpose is to show historical trends (it tracks every single metric for the past year), and its users are expected to understand that it doesn't help for the kind of thing this article is about.

I have been looking for rrd/cacti like graphing tools that work with millisecond sampling. Any ideas?

I monitor as often as possible to be alerted for sudden high traffic. To not add to the load, it checks every 30 seconds.

Cacti uses 5 minute intervals by default.

What tool do you use?