So here I did a bit of digging.
Looks like the is a limit of 50 per API call for SDK. You can increase it via Service Limits but being such a small number, looks the EventBus is low traffic for custom integration.
You can see using the Console with Event Rules and Schedule there are no such limits
Also, there is a throttling limit for invocations.
All very interesting. I'll have to give a thought on how the utility of this should work.
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