the unique ID of the message; can be omitted. only useful to ensure only one message with the given ID will ever be published (during its lifetime)
the name of the message
how long the message should be buffered on the broker, in milliseconds
the message variables as a JSON document; to be valid, the root of the document must be an object, e.g. { "a": "foo" }. [ "foo" ] would not be valid.
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the correlation key of the message