Which service primarily focuses on providing real-time performance insights for applications?

Amazon CloudWatch is the service that primarily focuses on providing real-time performance insights for applications. It enables users to monitor and observe their cloud resources, applications, and services in real time. Through its various features, such as metrics, dashboards, and alarms, CloudWatch allows users to gain visibility into the performance and operational health of their applications.

For instance, CloudWatch can collect operational data in the form of logs and events, and it can provide insights into various performance indicators like CPU utilization, memory usage, and request latencies. This functionality is critical for proactive management, allowing developers and system administrators to react quickly to performance issues and optimize resource use.

In contrast, AWS Config is focused on resource configuration compliance and monitoring, AWS Organizations is used for managing billing and multi-account environments, and AWS Trusted Advisor provides best practices recommendations for optimizing resource use and improving security and performance, but it does not provide real-time monitoring capabilities like CloudWatch does.