[logback-user] Servername in SocketAppender

Hi, I want to use the SocketAppender to collect log messages from more than one application server. It general it works fine, but I'm missing the servername or IP address of the server who sent the LoggingEvent. That means I need a layout like this: %date %servername %m%n In the documentation, I see a SocketAppender property called IncludeCallerData. But in the example it only prints %file and %line. What is the best practise to add the name/IP of the server which sent the logging event to the remote SimpleSocketServer? Best regards, Ingo