MRG messaging clarification on message id

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Issue

MRG messaging clarification on message id
The message id is generated by the broker when a message is sent to the broker. Right ?
What are the uniqueness properties of the message id ?
Can any two messages sent to the same broker have the same message id ?
What about messages in a federation ? Can any two messages sent to different brokers in the federation have the same message id ?
What is the format of the message id ? Looks like it is a UID

Environment

MRG 2.X

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