Salesforce Mobile Notifications Implementation Guide

Mobile Notifications Overview
Steps for Implementing Mobile Notifications
Sending Mobile Notifications
Using the Connect REST API Push Notification Resource (Optional)
PushNotificationPayload Class
Apex Limits Functions for Push Notifications
Push Notification Limits
Debug Log Events
Notifications Resources
Notification Builder Platform Push Payloads
Invocable Actions Custom
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Note: This release is in preview. Features described here don’t become generally available until the latest general availability date that Salesforce announces for this release. Before then, and where features are noted as beta, pilot, or developer preview, we can’t guarantee general availability within any particular time frame or at all. Make your purchase decisions only on the basis of generally available products and features.

Apex Limits Functions for Push Notifications

Use the Apex limits functions for push notifications to get usage information.
System.Limits class:
getLimitMobilePushApexCalls()
Returns the total number of Apex calls that are allowed per transaction for mobile push notifications.
getMobilePushApexCalls()
Returns the number of Apex calls that have been used by mobile push notifications during the current metering interval.