Add support for Kafka record headers (#1025)

Added support for Kafka headers to be passed and retrieved from functions. The headers and supported and work only for Kafka version 0.11.0.0 and higher.

charts/fission-all/templates/deployment.yaml

@@ -578,6 +578,8 @@ spec:
           value: kafka
         - name: MESSAGE_QUEUE_URL
           value: "{{.Values.kafka.brokers}}"
+        - name: MESSAGE_QUEUE_KAFKA_VERSION
+          value: "{{.Values.kafka.version}}"
       serviceAccount: fission-svc
 {{- end }}
 ---

charts/fission-all/values.yaml

@@ -73,6 +73,10 @@ azureStorageQueue:
 kafka:
   enabled: false
   brokers: 'broker.kafka:9092'
+  ## version of Kafka broker
+  ## Must be a string in the format "major.minor.veryMinor.patch"
+  ## Should be >= 0.11.0.0 to enable Kafka record headers support
+  # version: "0.11.0.0"
 
 ## Persist data to a persistent volume.
 persistence: