Modern cloud applications are composed of many interacting microservices whose complex dependencies can produce unexpected end-to-end failures. Under high load or adverse conditions, these interactions can amplify instability and trigger cascading failures that degrade reliability and availability. One particularly dangerous class of failures is metastability, where systems become trapped in self-sustaining states of congestion and overload, potentially leading to congestive collapse.
Bluebell is a project focused on helping developers design cloud systems that are both high-performance and resilient to metastability failures. Bluebell combines the high-level architectural abstractions provided by Blueprint with mathematical models of distributed systems to systematically explore the design space of microservice architectures. By analyzing how different design choices influence system stability, Bluebell identifies configurations that are more resistant to cascading failures and guides developers toward safer, more robust system designs early in the development process.