During Installation, some plugins may install services automatically. These could include pre-configured instances of the experts or policy managers.
Other plugins like AIM (Application Instrumentation Module), require that you deploy the instances you require. As an example, we will deploy a simple counter.
In the Enterprise Manager, right-click on your CEP Server instance. Select Deploy Expert > Samples > Counter.
On the next window, specify a name such as, MyFirstExpert, as shown below. Click Deploy, then OK to dismiss the dialog. Click Close.
Facts produced by an expert
You will now see a new instance on the tree, Counters. If you expand that tree, you will see the expert running and producing facts.
Facts are a fundamental concept. Facts are measurements (metrics) reported by an expert. A fact by itself has limited context. In the example, counter has a value of 3811. That is a fact. Obviously, our simple counter expert does not do much other than produce a simple counter that increments over time. More complex experts will produce thousands of facts.