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Understanding how to monitor your AWS resources and manage costs is just as important as knowing how to build with them. AWS provides comprehensive tools for observability, alerting, and cost management.
CloudWatch is the primary monitoring and observability service in AWS. It collects metrics, logs, and events from AWS resources.
CloudWatch automatically collects metrics from AWS services:
| Service | Example Metrics |
|---|---|
| EC2 | CPU utilisation, network in/out, disk reads/writes |
| RDS | Database connections, read/write latency, free storage |
| S3 | Number of objects, bucket size, request count |
| Lambda | Invocations, duration, errors, throttles |
CloudWatch Alarms let you define thresholds and take action when metrics exceed them:
Example alarm: If EC2 CPU utilisation exceeds 80% for 5 minutes, send an email via SNS.
CloudWatch Logs collects and stores log files from:
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