If you're looking to combine data 'emitted from applications' as well as data from the physical machine itself, the easiest way to go might be to write your own . NET Performance Counters for your application. This will have the 'business' data be available to a wide variety of consumers, basically anyone that can use the Windows Performance Monitor can read your business data.
You can then easily write an application that consumes/forwards this data, or you can rely on commercial programs that do server monitoring; most of them will be able to report on performance counters you designate, which means that your business and system performance goes through the same monitoring utility.
Zenoss Core is an award-winning open source IT monitoring product that effectively manages the configuration, health and performance of networks, servers and applications through a single, integrated software package.
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