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.
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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.