docs/concepts/bindings/specs/kafka.md

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.