Platform Events Developer Guide

Delivering Custom Notifications with Platform Events
Defining Your Platform Event
Publishing Platform Events
Subscribing to Platform Events
Considerations and Testing
End-to-End Example Using a Process and a Flow
Reference
Platform Event Limits
EventBusSubscriber
EventBus Class
TriggerContext Class
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Platform Event Limits

Limits are enforced for publishing platform events, event delivery in CometD clients, and platform event definitions.
Description Performance and Unlimited Editions Enterprise Edition All other supported editions
Maximum number of event notifications published per hour 100,000 100,000 1,000
Maximum number of event notifications delivered to CometD clients within a 24-hour period1 50,000 25,000 10,000
Maximum number of platform event definitions that can be created in an org 100 50 5
Maximum number of processes or flow interviews that can subscribe to a platform event 500 500 500
Maximum number of active processes or flow interviews that can subscribe to a platform event 50 50 50

1To request a higher number of events delivered to CometD clients, contact Salesforce to purchase an add-on license. The add-on license increases your daily limit of delivered events by 100,000 more events. For example, for Unlimited Edition, the add-on license increases the daily limit of delivered events from 50,000 to 150,000 events. You can purchase multiple add-ons to meet your event requirements for CometD clients. To avoid deployment problems and degradation in service, we recommend that the number of events delivered to CometD clients not exceed 5 million per day. If you require additional external events, contact your Salesforce representative to understand how the product can scale to meet your needs.