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Hello HHH,
Thank you for your feedback.
By default, your instance is enabled for basic monitoring. You can optionally enable detailed monitoring. After you enable detailed monitoring, the Amazon EC2 console displays monitoring graphs with a 1-minute period for the instance.
I assume that you’re referring to High-Resolution metrics. Metrics produced by AWS services are standard resolution by default. When you publish a custom metric, you can define it as either standard resolution or high resolution. When you publish a high-resolution metric, CloudWatch stores it with a resolution of 1 second, and you can read and retrieve it with a period of 1 second, 5 seconds, 10 seconds, 30 seconds, or any multiple of 60 seconds.
References:
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-cloudwatch-new.html
Regards,
Carlo