anchor.diff:  
   `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.+This metric is particularly useful to provide auto-scaling feedback to PaaS platform of your choice.
  
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: For example `headers.key` or `payload.myKey`.
  +
  Default: `none`.
  headerPatterns::
    A comma-delimited list of simple patterns to match spring-messaging headers to be mapped to the kafka `Headers` in the `ProducerRecord`.
    Patterns can begin or end with the wildcard character (asterisk).
    Patterns can be negated by prefixing with `!`; matching stops after the first match (positive or negative).
    For example `!foo,fo*` will pass `fox` but not `foo`.
    `id` and `timestamp` are never mapped.
  +
  Default: `*` (all headers - except the `id` and `timestamp`)
  configuration::
    Map with a key/value pair containing generic Kafka producer properties.
  +
  