Platform Events Developer Guide

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Platform Events Developer Guide
Delivering Custom Notifications with Platform Events
Defining Your Custom Platform Event
Publishing Platform Events
Subscribing to Platform Events
Set Up Debug Logs
Flows
Processes
Apex Triggers
Lightning Components
Pub/Sub API
CometD
Group Your Event Streams
Filter Your Event Streams
Platform Event Filters
Filter Expression Format
Field Considerations
Event Delivery Usage for Filtered Streams
Filter Expressions in Channel Members
Subscribe to the Channel and Receive the Filtered Event Stream
Get Custom Channels and Channel Members
Obtain a Platform Event’s Subscribers
Identify and Match Event Messages with the EventUuid Field
Testing Your Platform Event in Apex
Encrypting Platform Event Messages at Rest in the Event Bus
Monitor Platform Event Publishing and Delivery Usage
Considerations
Examples
Reference
PDF

Event Delivery Usage for Filtered Streams

The event delivery allocation applies to the number of events delivered after the filter is applied and not before filtering. Because a filter can reduce the number of events delivered to a subscriber, using a filter helps lower a subscriber's usage of the event delivery allocation.

For example, a client subscribes to a channel to receive order events, and the event bus contains 100 such events to deliver. But the channel member for Order_Event__e has a filter that matches only order events with certain values for the city and amount fields. Out of the 100 order events, 15 match the field values and are delivered. The event delivery usage is in this case 15 events and not 100. For more information about the event delivery allocation, see Platform Event Allocations.