Event Notification Rules
Notifications are generated for record events based on how you configure your PushTopic. The Streaming API matching logic uses the NotifyForOperationCreate, NotifyForOperationUpdate, NotifyForOperationDelete, NotifyForOperationUndelete, and NotifyForFields fields in a PushTopic record to determine whether to generate a notification.
Clients must connect using the cometd/29.0 (or later) Streaming API endpoint to receive delete and undelete event notifications.