Datadog's new Notebooks feature allows users to combine real-time or historical graphs with Markdown cells, enabling the creation of detailed postmortems, dynamic runbooks, and open-ended exploration for troubleshooting. Notebooks support adjustable timeframes for graphs, making it easier to identify warning signs and create alerts for future incidents. They also provide a platform for collaborative documentation and updating runbooks, improving response times during issues. Additionally, the feature allows users to freely explore their infrastructure or application metrics without affecting existing dashboards.