AWS Certified Solutions Architect - Associate (SAA-C02)

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CloudWatch Metric Update Frequency

According to the AWS documentation as well as chapter 12.3, EC2 metrics send updates to CloudWatch every 5 minutes when detailed monitoring is disabled and every 1 minute when detailed monitoring is enabled. However, it turns out this is not always true. In fact, there are some metrics, such as EC2 status check metrics, that send updates every 1 minute even when detailed monitoring is disabled. This explains why the instructor, in chapter 12.1, created a metric alarm for "StatusCheckFailed_Instance" using a 1 minute period and didn’t get stuck in the "insufficient data" alarm state.

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