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# CloudWatch

## CloudWatch (Monitoring & Metrics)

A service which allows monitoring and metrics of performance of other AWS services (e.g. EC2). Set thresholds to trigger alarms.

* e.g. EC2: CPU utilisation > 80%
* e.g. S3: number of objects in a bucket > 100
* e.g. Billing: current monthly billing > 500$

### [Pricing](https://aws.amazon.com/cloudwatch/pricing/)

* per dashboard
* Detailed monitoring for EC2 instances
* CloudWatch custom metrics
* CloudWatch API request
* CloudWatch Logs
* CloudWatch Events/Custom Events