anchor.diff:  nothing below the error level will be sent to your logging stack. That means that even GELF in this example will receive only error level log messages.
   
   === Configure additional key values
  -Currently, the Keycloak configuration does not support partly dynamic configuration keys, as they are used in quarkus properties, e.g. when defining `quarkus.log.handler.gelf.additional-field.<my-name>.value`.
  -
  -In order to add additional user-defined fields, you can provide them directly through a quarkus.properties file. Please refer to the <@links.server id="configuration"/> guide at section _Using unsupported server options_.
  +Currently, the Keycloak configuration does not support partly dynamic configuration keys, as they are used in quarkus properties. For example, they are used when defining `quarkus.log.handler.gelf.additional-field.<my-name>.value`.
  +
  +To add user-defined fields, you can provide these fields through a quarkus.properties file. Refer to the <@links.server id="configuration"/> guide and the _Using unsupported server options_ section.
   
   </@tmpl.guide>
  
positive.code: http://localhost:9000/api/system/inputs
  ----
  
  If the stack is still in the bootstrap phase, you receive a response containing `* Empty reply from server`. A successfull response includes `HTTP/1.1 201 Created` to indicate that the UDP input is created.
  
  ==== Configure Keycloak to send logs using GELF
  Keycloak needs to be configured to send logs using GELF. The appropriate configuration can be seen in the keycloak.conf example below.
  
  Note that for this example to work, it is not really necessary to add the `log-gelf-host` and `log-gelf-port` values to your configuration, as these are the defaults and only shown for illustrational purposes.
  . Keycloak GELF Configuration
  
  [source, conf]
  ----
  
negative.code: 
  This file activates and configures the logstash GELF plugin and points it to the right elasticsearch instance.
  
  ==== Starting the ELK stack
  The composed stack consists of:
  
  * ElasticSearch
  