[Commons Wiki] Update of "Monitoring" by nicolasDeLoof

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The following page has been changed by nicolasDeLoof:
http://wiki.apache.org/commons/Monitoring

New page:
'''Monitoring''' design document

commons-monitoring defines a limited set of classes (interface) for application instrumentation :

 * '''Monitor''' is used to specify a monitored resource (with very large sense), defined by a Key. The key itslef is a composite of a name, a category (technical application layering) and subsystem (fonctionnal)

 * '''Repository''' to get or create monitors

 * '''StatValue''' to handle application state. It supports some basic statisticals. Derived interface '''Gauge''' and '''Counter''' provide more specific methods.

A monitor handle a set of values, identified by roles Strings. Some default roles are defined for ''PERFORMANCES'' and multi-thread ''CONCURRENCY''.


TODO explain period-based monitoring like "per 5 minutes values" used to build monitoring graphs.

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