We had to bypass the Frontdoor
They call it a DREAM stack (Daft, Ray Engine or Ray and Poetry, Argo and Metaflow)
But I also saw how hard it is to understand a large system that built using actors. It is just hard to comprehend all the communication pathways and what happens in the system.
To reduce the potential blast radius, we are working on a cohort-based canary, which will allow us to validate against a minimal, stable subset of traffic with the desired properties.