AWS IoT SiteWise publishes metrics on a one minute interval. When you view these metrics in graphs in the CloudWatch console, we recommend that you choose a Period of 1 minute. This lets you see the highest available resolution of your metric data.
To receive gateway metrics, you must use at least version 6 of the AWS IoT SiteWise connector on your gateway. For more information, see AWS IoT SiteWise connector in the AWS IoT Greengrass Version 1 Developer Guide.