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You can monitor and graph demands on distributed systems' capacities via Nagios (or its fork Icinga) and its "nagiosgraph" plugin. Once you have this, it's pretty easy to project forward and predict future demand, which gives you an informed basis for a capacity expansion plan.
Nagios is one of the oldest and most widely used distributed system monitoring tools. It is used to monitor datacenters, ISPs, corporate networks, etc.
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