Which Type of Platform Events Do Allocations Apply to?

Platform events can be custom events, which are platform events that you define, or standard events, which are the events that Salesforce defines, including Real-Time Event Monitoring events.

Event Type	Counts towards event publishing allocation	Counts towards event delivery allocation and entitlement via add-on
Custom events that you define
Standard events. See Standard Platform Event Object List.		Check the “Event Delivery Allocation Enforced” section in each event reference documentation in Standard Platform Event Object List.
Real-Time Event Monitoring events. See Real-Time Event Monitoring Objects.

When allocations aren’t enforced, system protection limits apply.