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An Application Pool can contain one or more applications and provides a level of isolation between different Web applications. For example, if you want to isolate all the Web applications running in the same computer, you can do this by creating a separate application pool for every Web application and placing them in their corresponding application pool. Because each application pool runs in its own worker process, errors in one application pool will not affect the applications running in other application pools.

The IISAppPoolsTest discovers all the application pools configured on an IIS Web server and monitors their status. Note that this test will work on IIS v. 6.0 and above only.

Measurement	Description	Measurement Unit	Interpretation
AppPool_status	Indicates the current status of this application pool	Boolean	If this measure returns the value 1, it indicates that the application pool has started or is starting. While the value 0 for this measure indicates that the application pool has stopped or is stopping, the value -1 indicates that the pool is in an 'Unknown' state. If this measure reports the value 0 or -1, then you need to make sure that the application pool is started. If a pool has stopped, then you can use the detailed diagnosis of this measure to identify the applications that are impacted as a result of this pool stopping.