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RLMM instance on broker publishes the message to the topic with key as null and value with the below format. 

type      : unsigned var int, represents Represents the value type. This value is 'apikey' as mentioned in the schema.  Its type is 'byte'.
version : unsigned var int, the 'version' number of the type as mentioned in the schema.  Its type is 'byte'.
data      : record payload in kafka protocol message format, the schema is given below.

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