THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
...
bin/kafka-configs.sh --zookeeper localhost:2181 --alter --add-config 'scram_sha-256-=[password=alice-secret,scram_sha-256-iterations=4096],
scram_sha-1-=[password=alice-secret]
' --entity-type users
--entity-name alice
...