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    <blockquote> <p>Amazon CloudWatch provides a reliable, scalable, and flexible monitoring solution that you can start using within minutes. You no longer need to set up, manage, or scale your own monitoring systems and infrastructure. Using Amazon CloudWatch, you can easily monitor as much or as little metric data as you need. Amazon CloudWatch lets you programmatically retrieve your monitoring data, view graphs, and set alarms to help you troubleshoot, spot trends, and take automated action based on the state of your cloud environment.</p> </blockquote> <p>This is a web service like the rest of Amazon Web Services. You can work with it through an API as well as through the Console. You can also integrate it with other services like Simple Notification Service (SNS) and even Auto-Scaling your instances.</p> <p>The idea of the custom metric mechanism is to allow you to extend the build-in metrics that are provided by AWS to ones that are either not accessible to AWS (like your memory and disk status), or are relevant to your business (size of purchase, user demographic...).</p> <p>CloudWatch is scalable and reliable service that you don't need to install nor manage. </p> <p>Another important feature is the ability to set up alarms on your metrics. For example, you can send you an email when a threshold on your metric is reached (you sold more than 1,000 items in a day, for example).</p> <p>Now, with the addition of Lambda, you are having even more option to use the CloudWatch Metrics and Alarms. You can subscribe a Lambda function to an alarm based on a custom metric, and react to such events in real time automatically. See here for an example to auto scale your Docker environment in Elastic Container Service (ECS): <a href="https://aws.amazon.com/blogs/compute/scaling-amazon-ecs-services-automatically-using-amazon-cloudwatch-and-aws-lambda/" rel="nofollow">https://aws.amazon.com/blogs/compute/scaling-amazon-ecs-services-automatically-using-amazon-cloudwatch-and-aws-lambda/</a></p>
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