May 18, 2009
Amazon CloudWatch tracks and stores a number of per-instance performance metrics including CPU load, Disk I/O rates, and Network I/O rates.
Auto Scaling lets you define scaling policies driven by metrics collected by Amazon CloudWatch. Your Amazon EC2 instances will scale automatically based on actual system load and performance but you won’t be spending money to keep idle instances running.
(Link: New Features for Amazon EC2: Elastic Load Balancing, Auto Scaling, and Amazon CloudWatch)
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