Sentry uses Code Mappings to connect errors to the source code in a repository, providing features such as navigating directly to the source code from the issue details page and analyzing who touched the line that triggered the error to suggest an assignee. However, setting up Code Mappings was previously cumbersome, but Sentry has simplified this process by enabling automatic Code Mappings for customers with the GitHub integration installed in certain languages. To achieve this, Sentry had to overcome technical challenges such as scaling processing jobs and using GitHub APIs efficiently while adhering to rate limits. The feature is currently available for Python, JavaScript, Node, and Ruby languages, but more languages and integrations are planned.