anchor.diff:  Configure the default GELF message factory in the appender:
   [source,xml]
   --
  -<appender name="GRAYLOG2" class="com.github.pukkaone.gelf.logback.GelfAppender">
  +<appender name="GRAYLOG" class="com.github.pukkaone.gelf.logback.GelfAppender">
     ...
     <marshaller class="com.github.pukkaone.gelf.logback.DefaultGelfMessageFactory">
       <shortMessagePattern>%.-20m</shortMessagePattern> <!-- at most 20 initial characters -->
  
positive.code:     AMQP URI (*required when using AMQP integration*)
  
  `amqpExchange`::
      AMQP exchange name - should be the same as setup in graylog2-radio
      (*required when using AMQP integration*)
  
  `amqpRoutingKey`::
      AMQP routing key - should be the same as setup in graylog2-radio
      (*required when using AMQP integration*)
  
  `amqpMaxRetries`::
  
negative.code: = Logback appender that sends GELF messages
  
  Send log events to a Graylog server by GELF protocol over UDP, TCP, TCP over
  SSL, or AMQP transport.
  
  
  