In our documentation around Realm Billing ( https://docs.mongodb.com/realm/billing/ ) we do not discuss granularly how Realm Database Triggers + Realm Functions are billed; and how they are different or the same than Realm Data Triggers + AWS EventBridge.  This request is to provide clarity on how these costs are calculated. 

You can confirm with Drew DiPalma, but both are billed in the following way: 

Realm Function Event Type =
1 Realm Request + Data Transfer + Realm Compute

EventBridge Event Type =
1 Realm Request + Data Transfer + Realm Compute

This is confusing because if you look at our billing documentation (( https://docs.mongodb.com/realm/billing/ ), we mention that a "Trigger Execution" counts as "one" Realm Request, and that a "Function Execution" counts as a separate Realm Request. Since a Database Trigger can be configured to then execute a Realm Function; customers would assume the following: 
 
Realm Function Event Type =
("Trigger Execution" + "Function Execution") + Data Transfer + Realm Compute
= 2 Realm Requests + Data Transfer + Realm Compute

These two "Function" types, are described here:  https://docs.mongodb.com/realm/triggers/database-triggers/