The Generic Log Adapter Connector processes log files and transforms them to Common Base Event (CBE) objects, which are then fed into the AssemblyLine. You can use the information and link provided here to know more about Generic Log Adapter Connector.
It uses Generic Log Adapter (GLA) technology, part of IBM Autonomic Computing Toolkit, to process log files and transform their contents into Common Base Event format. The IBM Redbook A Practical Guide to the IBM Autonomic Computing Toolkit contains information on how to configure and use Generic Log Adapter.