Definition of exception events

Critical application and system errors. Application Performance Monitoring (APM) defines critical errors as being those that lead to a monitored component’s failure. For ASP.NET- applications, a critical exception results in the user seeing either the standard or a custom error page.- For web services, critical exceptions- are those that ASP.NET serializes into valid SOAP- messages on the serverside, and deserializes to SoapExceptions- on the ASP.NET client.

— Computer Science