# CloudWatch

* **A collection of multiple services.**

## CloudWatch Metrics:

* **Represents a time-ordered set of data points.**<br>
* **A variable to monitor, and the data points as representing the values of that variable over time.** <br>
* For example, the **CPU Usage of a particular EC2 instance** is one metric provided by Amazon EC2, another one is **Disk Writes to EBS Volumes.**<br>

## **CloudWatch Logs:**

* **Monitor logs for performance data about AWS services, e.g. EC2, CloudTrail, Route53.**<br>

## **CloudWatch Events:**

* **Trigger something based on a condition**, like an **email being sent when a root user logs in** or **take an EBS snapshot every hour.**<br>

## **CloudWatch Alarms:**

* **Trigger a notification a metric**, like if the **CPU Usage goes above 50%, then do an SNS notification to the owner.**


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