Datadog's new Notebooks feature allows users to create detailed postmortems that can be shared with their team, using real-time or historical graphs combined with Markdown cells. This feature enables the creation of dynamic runbooks and provides an open-ended exploration sandbox for troubleshooting metrics. With notebooks, users can easily organize and contextualize incidents, identify warning signs, and document them in a way that's accessible to the entire team. The feature also allows users to save their work and share it with others, making it easy to collaborate on internal documentation and improve engineering teams' productivity.