You need to enable JMX port to install the Kafka monitoring plugin successfully.
To enable it, find the following code block in the kafka-server-start.sh script:
if [ "x$KAFKA_HEAP_OPTS" = "x" ]; then
export KAFKA_HEAP_OPTS="-Xmx1G -Xms1G"
fi
Below the aforementioned code block, paste the following lines:
export KAFKA_JMX_OPTS="-Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.port=9999"
export JMX_PORT=9999
Restart the Kafka Broker service after making the above changes.