Amazon CloudWatch is a monitoring service for AWS resources and the applications that you run on the cloud platform. It provides data and operational insights for various resources such as EC2 instances, RDS databases, Lambda functions, and more. With CloudWatch, you can collect, track, and visualize performance, availability, and other metrics for your resources and applications.
One of the main features of CloudWatch is its ability to set alarms and send notifications when certain thresholds are breached. For example, if the CPU utilization of an EC2 instance goes above a certain level, CloudWatch can send an alert to the administrator via email, SMS, or other means. This can help you identify and troubleshoot issues with your resources before they become critical.
CloudWatch also provides log monitoring and analysis capabilities. It can collect, store, and process log data from various sources, such as EC2 instances, RDS databases, and VPC flow logs. You can use CloudWatch Logs Insights to search and analyze log data in real-time, or set up CloudWatch Metric Filters to extract specific data from the logs and create metrics based on it. This can help you troubleshoot issues, identify patterns, and monitor the health and performance of your applications and resources.
In addition to monitoring resources and logs, CloudWatch also provides integration with other AWS services, such as Auto Scaling, Amazon EC2, and Amazon ECS. For example, you can use CloudWatch to scale your EC2 instances up or down based on performance metrics, or to trigger actions in response to specific events, such as deploying a new version of an application.