Monitor Event Publishing and Delivery Usage
To get usage data for event publishing and CometD-client delivery, query the PlatformEventUsageMetric object. Usage data is available for the last 24 hours, ending at the last hour, and for historical daily usage. PlatformEventUsageMetric contains separate usage metrics for high-volume platform events and change data capture events.
Make Apex Callouts After Publishing Platform Event Messages
You can now make Apex callouts after publishing event messages for events configured with the Publish Immediately behavior. Previously, after publishing such events, you couldn't make callouts from any Apex code. Events published immediately have a new limit, which is separate from the Apex DML statement limit.
Get the Status of High-Volume Platform Event Publish Operations (Beta)
High-volume platform events are published asynchronously. With publish status events, you can track the status of publishing operations, and take the necessary actions. Enable status events on the high-volume platform event you are interested in tracking. Then subscribe to the PublishStatusEvent standard platform event.