anchor.diff:  Configure the custom 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.example.MyGelfMessageFactory">
       <mdcTimestampProperty>ReceivedDateTime</mdcTimestampProperty>
  
positive.code: == Options
  
  `graylogHost`::
      Host name of Graylog2 server where it will send the GELF messages.
      Prefix with `udp:` to send by UDP.
      Prefix with `tcp:` to send by TCP.
      Prefix with `ssl:` to send by TCP over SSL.
      If no prefix is present, then the transport is UDP.
  
  `graylogPort`::
      Port on which the Graylog2 server is listening; default 12201 (*optional*)
  
  `originHost`::
      Name of the originating host; defaults to the local hostname (*optional*)
  
negative.code:     AMQP URI (*required when using AMQP integration*)
  
  `amqpExchange`::
      AMQP exchange name - should be the same as setup in graylog-radio
      (*required when using AMQP integration*)
  
  `amqpRoutingKey`::
      AMQP routing key - should be the same as setup in graylog-radio
      (*required when using AMQP integration*)
  
  `amqpMaxRetries`::
  