[Strimzi] [Release] Strimzi 0.4.0

[Jakub Scholz]

Strimzi 0.4.0 has been released. The most notable changes since 0.3.1 are:
* Better configurability of Kafka, Kafka Connect, Zookeeper
* Support for Kubernetes request and limits
* Support for JVM memory configuration of all components
* Controllers renamed to operators
* Improved log verbosity of Cluster Operator
* Update to Kafka 1.1.0

List of all issues can be found here:
https://github.com/strimzi/strimzi/issues?page=1&q=milestone%3A0.4.0

This release has some backwards incompatible changes:
* Cluster Controller and Topic Controller were renamed to Cluster Operator
and Topic Operator
  * Roles, role bindings and service accounts existing from previous
deployments can not be reused
* The following fields from Kafka ConfigMap have been replaced with new
field `kafka-config`
  * `KAFKA_DEFAULT_REPLICATION_FACTOR`
  * `KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR`
  * `KAFKA_TRANSACTION_STATE_LOG_REPLICATION_FACTOR`
* The following fields from Kafka Connect ConfigMap have been replaced with
new field `connect-config`
  * `KAFKA_CONNECT_BOOTSTRAP_SERVERS`
  * `KAFKA_CONNECT_GROUP_ID`
  * `KAFKA_CONNECT_KEY_CONVERTER`
  * `KAFKA_CONNECT_KEY_CONVERTER_SCHEMAS_ENABLE`
  * `KAFKA_CONNECT_VALUE_CONVERTER`
  * `KAFKA_CONNECT_VALUE_CONVERTER_SCHEMAS_ENABLE`
  * `KAFKA_CONNECT_CONFIG_STORAGE_REPLICATION_FACTOR`
  * `KAFKA_CONNECT_OFFSET_STORAGE_REPLICATION_FACTOR`
  * `KAFKA_CONNECT_STATUS_STORAGE_REPLICATION_FACTOR`

For more details go to http://strimzi.io/ and/or
https://github.com/strimzi/strimzi/releases/tag/0.4.0

Thanks to everyone who help with this release.

Jakub
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