The four key components of CloudWatch
Metrics, Alarms, Logs, Events
What is CW used for ?
To monitor the health and status of AWS resources and take action based on that information
What are the sources of CW metrics ?
Services auotmatically publish most metrics but customers can use the CW API to publish their own metrics data via CLI or SDK
What is a CW Alarm
Alarms allow customers to monitor metrics and take specific actions when a threshold is breached
What are some examples of actions that can be taken from a CW alarm ?
Send an SNS notification, scale out an ASG, reboot an EC2 instance