Getting Started with AWS CloudWatch

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AWS CloudWatch is a monitoring and observability service provided by Amazon Web Services (AWS) that provides data and actionable insights to monitor applications hosted on AWS, including infrastructure usage and performance metrics. It allows you to collect and track metrics, collect and monitor log files, and set alarms.

Some key things to know about AWS CloudWatch:

CloudWatch collects monitoring and operational data in the form of logs, metrics, and events from AWS resources like EC2 instances, Lambda functions, ELB load balancers, and other AWS services like DynamoDB and RDS. It provides customizable dashboards, alarms, and auto-scaling configurations to gain actionable insights into your AWS resources. 

With CloudWatch, you can collect metrics every 5 minutes for things like CPU utilization, network traffic, disk reads/writes and more from EC2 instances. It also collects metrics from other AWS services and resources like API latency for API Gateway, request count and error rate for Lambda functions. This helps you understand performance and bottlenecks.

CloudWatch alarms allow you to set thresholds and get notified through email/SMS/other services when metrics cross those thresholds. For example, you can configure an alarm to notify when average CPU usage of an EC2 instance goes above 90% continuously for 5 minutes. This helps you react to issues before they impact users.

The CloudWatch logs feature allows you to aggregate all your logs from multiple sources into a central location for long term storage, monitoring and analysis. You can search and analyze logs from EC2 instances, Lambda functions, API Gateway and more. Logs are kept indefinitely unless specifically deleted.

CloudWatch dashboards allow you to visualize metrics and logs together to gain a holistic view of your AWS resources and applications. Default and custom dashboards can be created to monitor specific KPIs. Permissions can be set to control who can access these dashboards.

That covers some of the key features and benefits of AWS CloudWatch for collecting metrics, monitoring logs and gaining operational insights into AWS resources and applications.

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