In section 14.1.2 it mentions "cluster node ID" .
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In replication HA mode, you can configure a master broker so that at start-up it will search the cluster for another broker using the same cluster node ID.
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However when I searched the doc there was no explanation what a cluster node ID was. Can more information be provide around cluster node ID - for example

• what is "cluster node ID" used for
• is it unique for a instance broker
• does the cluster node id outlive the live time of a broker instance
• can a broker be configured with a cluster node ID.

Also, the warning box in 14.1.2 seems to contradict the previous info - maybe more context is needed in the warning.