anchor.diff:                                                     Set this to an empty string to disable forwarding alarms.
   | `nodeTopic`             | `nodes`              | Name of the topic used for nodes.
                                                      Set this to an empty string to disable forwarding nodes.
  -| `eventFilter`           | (none)               | A Spring SpEL expression (see bellow) used to filter events.
  +| `eventFilter`           | `-`                  | A _Spring SpEL expression_ (see bellow) used to filter events.
                                                      Set this to an empty string to disable filtering, and forward all events.
  -| `alarmFilter`           | (none)               | A Spring SpEL expression (see bellow) used to filter alarms.
  +| `alarmFilter`           | `-`                  | A _Spring SpEL expression_ (see bellow) used to filter alarms.
                                                      Set this to an empty string to disable filtering, and forward all alarms.
   | `nodeRefreshTimeoutMs`  | `300000` (5 minutes) | Number of milliseconds to wait before looking up a node in the database again.
                                                      Decrease this value to improve accuracy at the cost of additional database look ups.
  
positive.code: ----
  
  Next, install the `opennms-kafka-producer` feature from that same shell using:
  [source]
  ----
  admin@opennms()> feature:install opennms-kafka-producer
  ----
  
  In order to ensure that the feature continues to be installed as subsequent restarts, add `opennms-kafka-producer` to the `featuresBoot` property in the `${OPENNMS_HOME}/etc/org.apache.karaf.features.cfg`
  
  === Configuring the Kafka Producer
  
  The Kafka Producer exposes the following options to help fine tune its behavior.
  
  [options="header, autowidth"]
  |===
  
negative.code: 
  ===== Node Criteria
  
  The _node criteria_ is a string representation of the unique identifier for a given node.
  If the node is associated with a _foreign source (fs)_  and _foreign id (fid)_, the node criteria resulting node criteria will be the name of the _foreign source_, followed by a colon (:) and then the foreign id i.e. (fs:fid).
  If the node is not associated with both a _foreign source_ and _foreign id_, then the node id (database id) will be used.
  
  === Enabling the Kafka Producer
  
  The _Kafka Producer_ is disabled by default and can be enabled as follows.
  
  First, login to the _Karaf_ shell of your _{opennms-product-name}_ instance and configure the _Kafka_ client settings to point to your _Kafka_ broker.
  See link:https://kafka.apache.org/10/documentation.html#producerconfigs[Producer Configs] for a complete list of available options.
  
  [source]
  