We're attempting to use the SAM 6.4 Cloud Infrastructure component to monitor our AWS environment. By default Cloudwatch does not monitor memory or disk, however Amazon does provide a mechanism to capture that information through a script that populates an CloudWatch custom metric: Monitoring Memory and Disk Metrics for Amazon EC2 Linux Instances - Amazon Elastic Compute Cloud
Has anyone successfully been able to import a Cloudwatch custom metric? As long as I can get the statistics in the database somewhere I should be able to generate an alert on it.