CloudWatch

• A collection of multiple services.

CloudWatch Metrics:

• Represents a time-ordered set of data points.

• A variable to monitor, and the data points as representing the values of that variable over time.

• 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.

CloudWatch Logs:

• Monitor logs for performance data about AWS services, e.g. EC2, CloudTrail, Route53.

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.

CloudWatch Alarms:

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