Tablecloth Trick: Migrating Issue Alerts to a New System

Sentry undertook a complex migration to streamline its issue alerting system by consolidating various alert setups into a singular, cohesive system known as the workflow engine. This migration involved transforming issue alerts stored in JSON blobs into a more structured database format, allowing for consistent processing logic across different types of alerts. Over two million alerts were converted into queryable database rows, enabling both fast and slow conditions to be efficiently processed. The project also required integrating the new system with legacy notification systems to ensure continued delivery of alerts via various providers such as Slack and email. During the transition, the team ran the new system in parallel with the old one to troubleshoot performance issues and address incidents, such as an overloaded Redis shard that slowed down the platform. This migration ultimately allowed Sentry to fully utilize the new system for error alerts, with future plans to expand to other issue types and update the user interface accordingly.

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