Which AWS offering will meet these requirements?

Explanations:

Amazon EventBridge is primarily used for building event-driven applications and integrating various AWS services, but it does not specifically monitor operating costs or provide budget alerts.

Compute Savings Plans help optimize costs for compute resources but do not provide alerts or monitoring for overall operating costs across AWS services.

AWS Budgets allows users to set custom cost and usage budgets, and it sends alerts when spending exceeds the defined thresholds, making it ideal for monitoring overall operating costs.

Migration Evaluator is a tool designed to help assess and plan cloud migrations; it does not monitor costs or provide alerts for operating expenses in AWS.