Platform Events (Beta) Developer Guide

Delivering Custom Notifications with Platform Events (Beta)
Defining Your Platform Event
Platform Event Fields
Migrate Platform Event Definitions with Metadata API
Platform Event Considerations
Publish Platform Events
Subscribing to Platform Events
Platform Event API Considerations and Testing
Reference
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Platform Event Considerations

Take note of the considerations when defining platform events.
Permanent Deletion of Event Definitions
When you delete an event definition, it’s permanently removed and can’t be restored. Before you delete the event definition, delete the associated triggers. Published events that use the definition are also deleted.
Renaming Event Objects
Before you rename an event, delete the associated triggers. If the event name is modified after clients have subscribed to notifications for this event, the subscribed clients must resubscribe to the updated topic. To resubscribe to the new event, add your trigger for the renamed event object.
No Associated Tab
Platform events don’t have an associated tab because you can’t view event records in the Salesforce user interface.
No Record Page Support in Lightning App Builder
When creating a record page in Lightning App Builder, platform events that you defined show up in the list of objects for the page. However, you can’t create a Lightning record page for platform events because event records aren’t available in the user interface.