You can use either DynamoDB console or CloudWatch to monitor DynamoDB metrics, which are the same

Explanation

The graphs on the Metrics tab in the Amazon DynamoDB console are different from the graphs in the CloudWatch console. The metrics in the CloudWatch console are raw and provide more statistics options than the metrics in the DynamoDB console. The metrics in the DynamoDB console are average values over 1-minute intervals. For example, ConsumedWriteCapacityUnits is the sum of the consumed units over 1 minute, divided by the number of seconds (60) in a minute.