Which AWS service is designed specifically for real-time updates on changes across AWS resources?

AWS EventBridge is specifically designed to facilitate real-time updates on changes across AWS resources. It acts as a serverless event bus that allows you to connect different applications using events. When resources in AWS change, they can generate events that are sent to EventBridge, which can then route these events to various targets, such as Lambda functions, other AWS services, or even third-party applications. This capability allows for efficient monitoring and handling of resource changes in almost real time, enabling dynamic responses to events as they occur.

In a more general scenario, while AWS Lambda is a compute service that runs code in response to events, it does not inherently provide a mechanism for real-time updates about changes in AWS resources. AWS CloudTrail, on the other hand, focuses on logging API calls made within your AWS account, tracking governance and compliance rather than providing immediate event-driven updates. AWS Elastic Beanstalk is a platform as a service (PaaS) that simplifies application deployment and management but does not have the functionality of monitoring resource changes in real time. Hence, EventBridge stands out as the most suitable choice for providing real-time updates on AWS resource changes.