-bp is more generic, there would be nothing special about -address, but it may be nice to have some visual separation. Also, not all properties are relevant to config reload.
so it may make sense to support more prefixes in the future, to get some separation for addresses for example, app-address-bp will work. Just use a sensible naming convention before the prefix.

in any event, we need to have a way to externalise brokerProperties

• to avoid size limits of etcd
• to allow some clean separation of concerns
• to potentially allow some namespace capabilities, a referenced config map may not be in all namespaces and that may be desirable.
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