Slack migrated most of the critical user-facing services from a monolithic to a cell-based architecture over the last 1.5 years. The move was triggered by the impact of networking outages affecting a

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Slack migrated to a cell-based architecture on AWS to mitigate gray failures. The new architecture allows for incremental traffic shifting away from affected availability zones, improving resiliency.

Slack Migrates to Cell-Based Architecture on AWS to Mitigate Gray Failures