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ApiKey

This is a numeric id for the API being invoked (i.e. is it a metadata request, a produce request, a fetch request, etc).

ApiVersion

This is a numeric version number for this api. We version each API and this version number allows the server to properly interpret the request as the protocol evolves.

CorrelationId

This is a user-supplied integer. It will be passed back in the response by the server, unmodified. It is useful for matching request and response between the client and server.

ClientId

This is a user supplied identifier for the client application. The user can use any identifier they like and it will be used when logging errors, monitoring aggregates, etc.