i follow step on document add
[integration]
enabled = ["mqtt", "kafka"]
# Kafka integration configuration.
[integration.kafka]
brokers=["localhost:9092"]
tls=false
topic="chirpstack"
event_key="application.{{application_id}}.device.{{dev_eui}}.event.{{event}}"
username=""
password=""
mechanism="PLAIN"
json=true
then i restart chirpstack i got Error: Unexcepted integration: kafka