Which AWS service is used for monitoring AWS resources and applications?

Amazon CloudWatch is the primary service for monitoring AWS resources and applications. It allows users to collect and track metrics, collect log files, and set alarms. This means you can gain insights into the performance and operational health of your applications and infrastructure on AWS.

CloudWatch works by gathering metrics such as CPU usage, disk I/O, and network traffic from various AWS services, enabling users to visualize their application’s usage through dashboards. It also supports creating automated responses to certain conditions, such as scaling resources up or down in response to load changes based on predefined metrics.

Additionally, CloudWatch Logs enables you to store and analyze log files, making it easy to troubleshoot issues or audit applications. Through these features, it provides a comprehensive monitoring solution that can help maintain the reliability and performance of applications running in the cloud.

In contrast, other services like Amazon Inspector focus on security assessments, AWS Config deals with resource inventory and compliance, and Amazon CloudTrail provides logging for API call histories rather than offering real-time performance monitoring. Thus, Amazon CloudWatch is indeed the right choice for monitoring AWS resources and applications.