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Showing content from http://docs.aws.amazon.com/iot/latest/developerguide/cloudwatch-metrics-rule-action.html below:

CloudWatch metrics - AWS IoT Core

CloudWatch metrics

The CloudWatch metric (cloudwatchMetric) action captures an Amazon CloudWatch metric. You can specify the metric namespace, name, value, unit, and timestamp.

Requirements

This rule action has the following requirements:

An IAM role that AWS IoT can assume to perform the cloudwatch:PutMetricData operation. For more information, see Granting an AWS IoT rule the access it requires.

In the AWS IoT console, you can choose or create a role to allow AWS IoT to perform this rule action.

Parameters

When you create an AWS IoT rule with this action, you must specify the following information:

Examples

The following JSON example defines a CloudWatch metric action in an AWS IoT rule.

{
    "topicRulePayload": {
        "sql": "SELECT * FROM 'some/topic'", 
        "ruleDisabled": false, 
        "awsIotSqlVersion": "2016-03-23",
        "actions": [
            {
                "cloudwatchMetric": {
                    "metricName": "IotMetric",
                    "metricNamespace": "IotNamespace", 
                    "metricUnit": "Count",
                    "metricValue": "1",
                    "metricTimestamp": "1456821314",
                    "roleArn": "arn:aws:iam::123456789012:role/aws_iot_cw"
                }
            }
        ]
    }
}

The following JSON example defines a CloudWatch metric action with substitution templates in an AWS IoT rule.

{
    "topicRulePayload": {
        "sql": "SELECT * FROM 'some/topic'",
        "ruleDisabled": false,
        "awsIotSqlVersion": "2016-03-23",
        "actions": [
            {
                "cloudwatchMetric": {
                    "metricName": "${topic()}",
                    "metricNamespace": "${namespace}",
                    "metricUnit": "${unit}",
                    "metricValue": "${value}",
                    "roleArn": "arn:aws:iam::123456789012:role/aws_iot_cw"
                }
            }
        ]
    }
}