docs/concepts/bindings/specs/kafka.md

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# Kafka Binding Spec
```
apiVersion: dapr.io/v1alpha1
kind: Component
metadata:
name: <name>
spec:
type: bindings.kafka
metadata:
- name: topics # Optional. in use for input bindings
value: topic1,topic2
- name: brokers
value: localhost:9092,localhost:9093
- name: consumerGroup
value: group1
- name: publishTopic # Optional. in use for output bindings
value: topic3
```
`topics` is a comma separated string of topics for an input binding.
`brokers` is a comma separated string of kafka brokers.
`consumerGroup` is a kafka consumer group to listen on.
`publishTopic` is the topic to publish for an output binding.