Sentry's Uptime Monitoring is designed to catch outages the moment they happen, providing context and connecting users to the root cause of the issue. It proactively monitors web services by performing health checks on configured URLs every 60 seconds, alerting users when downtime is detected. The feature has been tested in production since September, with nearly 100,000 active uptime alerts created, and includes several highly requested features such as check history, improved issue details UX, distributed tracing support, geographically distributed checks, and additional monitor settings. Uptime Monitoring can help identify common causes of downtime, including pushing broken code, issues with dependencies like third-party APIs, and infrastructure issues or DDoS attacks. The feature is available automatically for the most frequently encountered hostname in error data, ensuring continuous monitoring of critical services, and users can create custom alerts for specific URLs with full control over request details.