name : create-custom-metric.rst **To create a custom metric published by your devices to Device Defender** The following ``create-custom-metric`` example creates a custom metric that measures battery percentage. :: aws iot create-custom-metric \ --metric-name "batteryPercentage" \ --metric-type "number" \ --display-name "Remaining battery percentage." \ --region us-east-1 \ --client-request-token "02ccb92b-33e8-4dfa-a0c1-35b181ed26b0" Output:: { "metricName": "batteryPercentage", "metricArn": "arn:aws:iot:us-east-1:1234564789012:custommetric/batteryPercentage" } For more information, see `Custom metrics <https://docs.aws.amazon.com/iot/latest/developerguide/dd-detect-custom-metrics.html>`__ in the *AWS IoT Core Developer Guide*.