How we silently switched error issue alerts to a new system.

Sentry is a platform for monitoring, troubleshooting, and error tracking in software applications. Readers can learn about logging, error handling, and performance monitoring techniques. With documentation, tutorials, and best practices, Sentry helps developers identify and fix issues in their applications, ensuring a seamless user experience.

Sentry Engineering

Sentry migrated their issue alerting system from multiple fragmented implementations to a unified workflow engine. The migration involved converting 2 million JSON blob-based alert configurations into 20 million normalized database rows, rewriting condition processing logic to handle both fast and slow evaluations, and running both systems in parallel before switching over. The team encountered a Redis performance incident during rollout due to shared key contention, which they resolved by sharding keys and provisioning a dedicated cluster. The new system now handles all error alerts with feature flags ready for other issue types.

Tablecloth Trick: Migrating Issue Alerts to a New System