Amazon VPC Network Address Translation (NAT) gateways - Amazon CloudWatch
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Amazon VPC Network Address Translation (NAT) gateways

The following example shows a component configuration in JSON format for NAT gateways.

{
  "alarmMetrics": [
    {
      "alarmMetricName": "ErrorPortAllocation",
      "monitor": true
    },
    {
      "alarmMetricName": "IdleTimeoutCount",
      "monitor": true
    }
  ]
}