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Is it correctly understood that this is useful for scaling the compute of a single logical application, probably maintained by a single team, and less for communicating across applications, where a traditional RPC or REST API might still make the most sense?

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Yes, that's pretty spot on. Though we do have plans to add cross-application support as well, at the minimum stub generation and likely service discovery. But some of the nicer properties like versioning and language-native types will likely be lost on the cross-application communication path.

I was wondering about Service discovery

Is there any suppptt for Publishing an event to all subscribes from a Module so all other modules that are interested could get that event payload ?

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