Frontend is data that we capture through User Experience Management (UEM). So - these are metrics such as # of User Actions, Duration of these actons, . ..
Backend is the stuff we capture on the Server Side starting on the Web Server through your App Server, ... -> basically we talk about how many PurePaths (=Requests) we have captured on how long they take
Deployments visualize new Application Deployments. We provide a generic REST API where you can tell Dynatrace when you deployed, e.g: a new version of your app into your environment. Or when you switched on a new feature through a feature flag. We visualize this moment in time with a vertical line. Very often we see that a new deployment has a positive or negative impact on your end users or server-sidse peformance. So we wanted to give you a way to visualize the time when you made a deployment change