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Code Block
./bin/kafka-storage.sh format -h 
usage: kafka-storage format [-h] --config CONFIG --cluster-id CLUSTER_ID [--add-scram SCRAM_CREDENTIAL] [--release-version RELEASE_VERSION] [--ignore-formatted] 

optional arguments:
  -h, --help            show this help message and exit
  --config CONFIG, -c CONFIG 
                        The Kafka configuration file to use. 
  --cluster-id CLUSTER_ID, -t CLUSTER_ID
                        The cluster ID to use. 
  --add-scram SCRAM_CREDENTIAL, -AS SCRAM_CREDENTIAL 
                        A SCRAM_CREDENTIAL to add to the __cluster_metadata log e.g. 
                        'SCRAM-SHA-256=[user=alice,password=alice-secret]'
						'SCRAM-SHA-256512=[user=alice,iterations=8192,salt="MWx2NHBkbnc0ZndxN25vdGN4bTB5eTFrN3E=",saltedpassword="mT0yyUUxnlJaC99HXgRTSYlbuqa4FSGtJCJfTMvjYCE="]' 
  --release-version RELEASE_VERSION, -r RELEASE_VERSION
                        A KRaft release version to use for the initial metadata version. 
  --ignore-formatted, -g

I propose the SCRAM_CREDENTIAL argument will be a key value pair where the key is one of the SCRAM mechanism SCRAM mechanisms supported, either SCRAM-SHA-256 or SCRAM-SHA-512, and the value is a set of key value pairs of parameters to populate the UserScramCredentialsRecord. The SCRAM_CREDENTIAL argument is very similar to the argument passed to the kafka-config tool for configuring SCRAM in a ZK cluster. See Configuring SCRAM for details. 

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