Traffic Shadowing and Canary Deployments in Production: Architecture, Semantic Divergence, and Automated Rollbacks for LLM Upgrades
Upgrading large language model pipelines in production presents an operational challenge distinct from traditional software deployments. In microservice architectures, canary deployments rely on deterministic signals: HTTP 5xx error rates, unhandled runtime exceptions, CPU saturation, and latency percentiles. When updating an LLM system (whether swapping a base model checkpoint, updating a system prompt, tweaking sampling hyperparameters, or attaching a newly fine-tuned LoRA adapter), the servic









