In this article, Py Surfaces Critical Errors with Sentry, a tool used for monitoring and tracking errors in software applications, has helped the company identify and fix issues with its sign-in process. The error was caused by a misconfiguration of a third-party service integration that was breaking the sign-in flow for users who were brought in through this integration. Py uses Sentry to track and surface critical errors, allowing it to focus on fixing the most significant issues first. The company has fixed the bug and now logs a warning instead of an error when encountering similar issues in the future, while also ignoring non-critical errors from third-party services that are not essential to its functionality.