Each time a request is processed by the ASP.NET processing engine a metric is recorded with the total time for the request and the time for each stage of the ASP.NET pipeline.

What Data is Captured by the Page Hit Metric

The Page Hit metric captures several values for every request to the ASP.NET engine. 

Caption	Type	Description	Summary Function
Page	String	The page name without path	Count
Absolute Path	String	The full path from the root of the web site to the page that was requested including the page	Count
Query String	String	The query string used for the request	Count
Total Request Duration	Double	The entire time it took for the request to be satisfied	Average
Authenticate Request Duration	Double	The time it took for the request to be authenticated	Average
Authorize Request Duration	Double	The time it took for the request to be authorized	Average
Resolve Request Cache Duration	Double	The time it took for the request to be looked up in cache	Average
Acquire Request State Duration	Double	The time it took for the request state to be acquired	Average
Request Handler Execute Duration	Double	The time it took for the request handler to execute. This includes the time for most ASP.NET page code.	Average
Release Request State Duration	Double	The time it took for the request state to be released	Average
Update Request Cache Duration	Double	The time it took for the request cache to be updated	Average
Log Request Duration	Double	The time it took for the request to be logged	Average
Cached Response	Boolean	Indicates if the response was served from the output cache instead of being generated.	Average

The captions align with the ASP.NET documentation for the various phases of processing a request and are listed in order above.  Most code written for ASP.NET is executed in the Request Handler phase and counted as the Request Handler Execute Duration.  If a response is returned from the ASP.NET output cache then the request handler is never executed and the Cached response value is true.

Charting and Graphing the Page Hit Metric

First, locate the Page Hit Metric in the session you're interested in:

Selecting the Page Hit Metric

You can then drag the metric onto a new graph or chart to analyze different information.  For example, if you chart the Average Total Request Duration by Absolute Path with a secondary plot of the number of hits you get the following chart:

Example Page Hit Metric Chart