anchor.diff:  +
   Default: null (If not specified, messages that result in errors will be forwarded to a topic named `error.<destination>.<group>`).
   
  +[[kafka-producer-properties]]
   === Kafka Producer Properties
   
   The following properties are available for Kafka producers only and
  
positive.code:   Size (in bytes) of the socket buffer to be used by the Kafka consumers.
  +
  Default: `2097152`.
  
  === Kafka Consumer Properties
  
  The following properties are available for Kafka consumers only and
  
negative.code: 
  `spring.cloud.stream.binder.kafka.someGroup.someTopic.lag`  - this metric indicates how many messages have not been yet consumed from given binder's topic by given consumer group.
  For example if the value of the metric `spring.cloud.stream.binder.kafka.myGroup.myTopic.lag` is `1000`, then consumer group `myGroup` has `1000` messages to waiting to be consumed from topic `myTopic`.
  This metric is particularly useful to provide auto-scaling feedback to PaaS platform of your choice.
  