Jean-Mathieu Saponaro discusses the second part of a three-part series on monitoring DynamoDB, focusing on collecting native DynamoDB metrics using CloudWatch. He explains that CloudWatch metrics can be accessed through the AWS Management Console, command-line interface, and third-party monitoring tools integrating with the CloudWatch API. Using the management console allows for simple automated alerts and visualizing recent changes in individual metrics, while also enabling graphing of selected metrics and creating custom alerts. The command line interface offers more control over queries, including filtering options, and is useful for spot checks and ad hoc investigations. Integrating CloudWatch with third-party monitoring tools provides extended functionality, such as correlating metrics across different infrastructure components or dynamically slicing and filtering data.