Meghan Lo and Aaron Kaplan introduce Change Overlays, a feature in Datadog that helps engineers identify and revert faulty deployments, which account for around 70 percent of all application outages. By visualizing deployments within metrics graphs, Change Overlays enables teams to quickly pinpoint the impact of specific changes on system health and performance, simplify troubleshooting, track metrics with enhanced context, and monitor the impact of their deployments at a glance. This feature uses version tags on APM services and RUM events to automatically identify deployments, making it easier for engineers to contain user impact while investigating issues. With Change Overlays, teams can quickly determine the last stable version to roll back to, analyze changes' impact and status, and integrate deployment tracking with overall monitoring of applications.