Code Mappings connect errors to the source code in a repository. And since errors can have paths that are different from the tree structure of the repository, Code Mappings determines the accurate path through a combination of a repository URL and a path transformation. Sentry uses Code Mappings to serve issue context on the issue details page.

How your code performs isn’t a subjective debate. Well, at least not anymore — in the past few months, Sentry has started telling you exactly what’s slow and where to fix it — specifically, N+1 database queries in your code. While we’ve all had to fix an N+1 problem, performance problems come in multiple flavors. Today, you’ll notice more Performance Issues in your issue feed, Slack alerts, and email notifications.