Amazon CloudWatch is a web service that enables you to monitor and manage various metrics, as well as configure alarm actions based on data from metrics.
Amazon CloudWatch monitoring enables you to collect, analyze, and view system and application metrics so that you can make operational and business decisions more quickly and with greater confidence. You can use Amazon CloudWatch to collect metrics about your AWS resources, such as the performance of your Amazon EC2 instances.
If you are registered for an AWS product that supports Amazon CloudWatch, the service automatically pushes basic metrics to CloudWatch for you. Once Amazon CloudWatch contains metrics, you can calculate statistics based on that data.
Amazon CloudWatch alarms help you implement decisions more easily by enabling you do things like send notifications or automatically make changes to the resources you are monitoring, based on rules that you define. For example, you can create alarms that initiate Auto Scaling and Simple Notification Service actions on your behalf.
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