Control Panel|System and Security|Performance Information and Tools|Advanced Tools|Open Performance Monitor

Application Restarts - the number of times an application has been restarted during the server's lifetime
Applications Running - the number of currently running web applications
Audit Failure Events Raised - the number of audit failures in the application since it was started
Audit Success Events Raised - the number of audit successes in the application since it was started
Error Events Raised - the number of error events raised by the application since it was started
Infrastructure Error Events Raised - the number of HTTP error events raised by the application since it was started
Request Execution Time - the number of milliseconds it took to execute the most recent request
Request Wait Time - the number of milliseconds the most recent request was waiting in the queue
Requests Current - the current number of requests including those that are queued, currently executing or waiting to be written to client. When counter exceeds requestQueueLimit as defined in processModel configuration section, ASP.NET begins rejecting requests
Requests Disconnected - the number of requests disconnected because of communication errors or user terminations
Request Queued - the number of requests waiting to be processed
Request Rejected - the number of requests rejected because request queue was full
State Server Sessions Abandoned - the number of sessions that have been explicitly abandoned
State Server Sessions Active - the number of sessions currently active
State Server Sessions Timed Out - the number of sessions timed out
State Server Sessions Total - the total number of sessions
Worker Process Restarts - the number of times a worker process has restarted on the machine
Worker Processes Running - the number of worker processes running on the machine

ASP.NET
ASP.NET Applications
ASP.NET Apps v4.0.30319
ASP.NET State Service
ASP.NET v4.0.30319