Related pages:

Using the , you can supplement the existing metrics in the AppDynamics Controller UI with your own custom metrics. There are many extensions currently available on the AppSphere Community site. Some are created by AppDynamics and some have been created by users.

Similar to built-in metrics, your custom metrics are subject to the following AppDynamics features:  

Add New Custom Metrics

To create custom metrics, you create a monitoring extension. In your extension, you define the name and path of your metric (where it appears in the metric browser tree), what type of metric it is (sum, average, and so on), and how the data for the metric should be rolled up as it ages. One Agent can run many extensions, although you may need to increase the amount of memory for the JVM Agent. You can have multiple copies of the same extension if they are in different directories.

A custom metric can be common across nodes or associated with a specific tier. When you create a metric, you specify the path in which it will appear in the metric tree. To create a common custom metric, use the root tree path Custom Metrics in your metric declaration. To create a tier-specific metric, specify the metric path associated with that component.   

If your application uses a large number of AppDynamics extensions with the Machine Agent, you may need to increase the size of the memory allocation:

% <machine_agent_home>/bin/machine-agent -Xms64m
> <machine_agent_home>\bin\machine-agent.cmd -Xms64m

Monitoring Extension Types

You can implement custom metrics using these mechanisms: