Myra
I would think that most Apllication Server providers have a monitoring tool that allows you to make such decisions. For example, JBoss has JOPR or JON (the same tool, but later supported by Red Hat). Others, such as webappVM, are specifically designed to run and collect metrics in the virtual cloud. You need to see what you have, the budget, and what is available for this environment.
Hope this helps,
Bruno santos
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