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PaaS and IaaS have a long way to go, however, especially in the area of monitoring. Most PaaS and IaaS providers only offer very limited machine metrics for your environment ? helpful for very small applications, but as you grow you'll need something better to troubleshoot performance problems.
Sure, you can use a Java profiling tool to work out some of the kinks in your application. But once you push it to production profilers don't work anymore, and boy is development different than production! All kinds of problems can surface in live production that no debugger could anticipate. You need some kind of application monitoring solution in your cloud application.
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