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
Apex Trigger Best Practices
Platform Event Processing at Scale with Parallel Subscriptions for Apex Triggers
Order of Events in Parallel Subscriptions
Choosing a Partition Key
Parallel Subscription Limits
Parallel Subscription Configuration Examples in Tooling API and Metadata API
Apex Trigger Repartitioning
Configure Parallel Subscriptions for an Apex Trigger
Testing an Apex Trigger Configured with Parallel Subscriptions
Parallel Subscriptions Considerations
Configure the User and Batch Size for Your Platform Event Trigger with PlatformEventSubscriberConfig
Find Uncaught Exceptions in Event Log Files
Resume a Platform Event Trigger After an Uncaught Exception
Retry Event Triggers with EventBus.RetryableException
Email Notifications for Triggers in Error State
Comparing setResumeCheckpoint() and EventBus.RetryableException
Lightning Components
Pub/Sub API
CometD
Group Your Event Streams
Filter Your Event Streams
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

Parallel Subscription Limits

Check out the limits for parallel subscriptions. These limits are enforced when you save the parallel subscription configurations using PlatformEventSubscriberConfig in Tooling API or Metadata API.
Limit Value
Maximum number of parallel subscriptions (partitions) that you can configure for one Apex trigger 10
Maximum number of Apex triggers that you can configure for parallel subscriptions 5

You can monitor how many Apex triggers are configured for parallel subscriptions by using the REST limits resources and checking for the PlatformEventTriggersWithParallelProcessing value.

This example shows a portion of the output of the REST limits resource that lists the maximum value and usage for the maximum number of Apex triggers that can be configured for parallel subscriptions. 

"PlatformEventTriggersWithParallelProcessing": {
        "Max": 5,
        "Remaining": 2
}