From 270GB RAM to 5GB: Moving local flag evaluation from Django to Rust

After migrating the local evaluation endpoint for feature flags from Django to Rust, significant improvements in performance and resource efficiency were observed, with latency reduced from 40ms to 4ms, CPU usage decreased by 24 times, and memory usage reduced by 56 times. The transition involved porting the endpoint logic, ensuring compatibility with Django's behavior, particularly in authentication and ETag handling, and splitting the Rust service into two fleets to manage distinct workloads. The rollout was executed incrementally, starting with internal SDKs and gradually shifting external traffic to ensure stability, revealing some bugs that were subsequently addressed. As a result, the Rust service now efficiently handles the same workload with significantly fewer resources, demonstrating the benefits of moving the feature flags local evaluation endpoint to Rust.

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