What are Build Event Handlers

This functionallity is part of version 1.5 which is currently in beta

Build Event Handlers are tasks which execute on the server (as opposed to Actions which run on the agents). They can be configured to respond to one or more Build Events which occur as the build progresses. 

The following Event Handler types are available:

How to Create an Event Handler

Build Event Handlers can be created within the Events step of the Configuration Wizard.