The logging facility, new with SAS 9.2, is a flexible, configurable framework that you can use to collect, categorize, and filter events and write them to a variety of output devices. The logging facility supports problem diagnosis and resolution, performance and capacity management, and auditing and regulatory compliance.
In the second maintenance release after SAS 9.2, FilteringAppender has been added to the documentation. This appender enables you to filter events to determine whether they should be passed to a referenced appender. The appender can apply a layout to the events before they are passed.
The primary use of FilteringAppender is to specify different layouts for different categories of events that are to appear together in the same log.