Jonathan Gala from Datadog is excited to announce the release of graph markers, which allow users to draw shaded regions and lines on their dashboard graphs to make it easier to interpret system state. This feature enables users to set boundaries and thresholds for certain metrics and systems, making it clearer what's considered normal and what's not. Adding markers is easy, and users can customize them using ranges or lines, with options to style, label, and use suffixes for big values. The feature also allows users to create multiple thresholds and show progression over time, making graphs even easier to understand.