TeeAppender makes sense. It should easy to implement. Here is how:

TeeAppender should implement AppenderAttachable interface. It should build upon AppenderAttachableImpl as done AsyncAppenderBase. Support for attaching filters and handling <appender-ref> comes for free (you don't have to code it). To distribute an incoming event into the nested appenders, invoke appenderAttachableImpl.appendLoopOnAppenders(event). In summary, AsyncAppenderBase should serve as a complete starting point.

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