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How a Dedicated ASP.NET Core Guardrail Microservice on Kubernetes Cut LLM API Latency

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A software team replaced ad-hoc regex filters in an LLM-powered API controller with a dedicated ASP.NET Core guardrail microservice deployed on Kubernetes. The new service uses Redis for live policy caching, Postgres with JSONB for versioned policy storage, and Azure Event Hubs for asynchronous audit logging. Horizontal pod autoscaling was configured using a custom metric tied to guardrail request throughput rather than CPU usage. In a real-world deployment serving a 24/7 customer support chatbot across four tenants, the redesign reduced 95th-percentile latency from 350 ms to 80 ms. The architecture also enabled the security team to push updated compliance rules within minutes, without redeploying the broader API surface.

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How a Dedicated ASP.NET Core Guardrail Microservice on Kubernetes Cut LLM API Latency · ShortSingh