Which service allows you to integrate system events from AWS resources to other target types?

The ability to integrate system events from AWS resources to other target types is primarily facilitated by CloudWatch Events. This service allows users to monitor changes in their AWS environment and respond to those changes in real-time.

CloudWatch Events can capture events from various AWS services and automatically route those events to different targets such as Lambda functions, SNS topics, SQS queues, and Step Functions, among others. This event-driven architecture enables automation and log processing, making it easier for developers to react and create dynamic applications based on real-time data from their AWS resources.

In contrast, the other services listed do not provide the same level of event integration functionality. For instance, AWS CloudFormation is primarily focused on infrastructure as code, allowing you to define and provision AWS resources. Amazon EC2 provides scalable computing capacity but does not inherently manage system events. Amazon SNS is a messaging service that allows for pub/sub communication, but it does not directly capture and respond to system events like CloudWatch Events does. This is why CloudWatch Events is the suitable service for integrating system events across various AWS resources.