Datadog has released a new feature called dark mode, which provides a striking way to visualize data by using light-colored text on darker backgrounds and graphical elements. The new color palettes for host maps, Viridis and Plasma, are also available in dark mode, providing a vibrant layout of hosts. Users can activate dark mode from anywhere in the Datadog app by hovering over their avatar and selecting the "Dark" theme, or cycle between themes using the shortcut Ctrl+Opt+D. The feature is now generally available for users to instantly start visualizing, troubleshooting, and exploring their infrastructure in a new light.