Knative Eventing Kafka Broker release v0.19.0

Breaking Changes

• Default replication factor is 3 (1 previously) (#375, @sheetalsingala)

Actions Required (pre-upgrade)

• Run kubectl delete configmap -n knative-eventing kafka-broker-brokers-triggers

🎁 New Features

• eventing-kafka.yaml can be used to install Broker and KafkaSink. (#367, @pierDipi)
• Data plane pods expose server and client metrics in Prometheus format. (#231 #244, @pierDipi)
  • The receiver component exposes:
    • http_requests_produce_total - Number of accepted produce requests (200-level responses)
    • http_requests_malformed_total - Number of malformed produce requests (400-level responses)
  • The dispatcher component exposes:
    • http_events_sent_total - Number of events delivered to Apache Kafka
• The Broker retries sending events. (#268 #263 #258, @pierDipi)

🎁 Improvements

• The container image's sizes are ~90MB instead of ~287MB. (#265 #306, @pierDipi @slinkydeveloper)
• Gracefully clean up resources on shutdown (#334, @pierDipi)

🐛 Bug Fixes

• Remove config-logging volume from the controller (#288, @pierDipi)
• Thread blocked when logging large configurations in debug mode (#346 #378, @slinkydeveloper)

📖 Documentation

• KafkaSink usage: https://gist.github.com/matzew/e2c2fcd2696a346f25b8bc9e64bfd0fa (@matzew)