The multicast target is a target that handles the redirection
of a logging event to one or more log targets. This target is
typically used in conjuction with different filters to control
and qualify the information presented to different targets.
For example, an application my configure a console target with
summary warning and error reports to console, and a detailed
error logg with full stack trace to a rotating file target.
The multiplex target enabled the declaration of a single logical
target and the subsequent formatting and generation of log message
appropriate for the relative targets.