This is a submission for DEV's Summer Bug Smash: Clear the Lineup powered by Sentry.
Project Overview
TextStack is an open-source reader for technical books, built in .NET: an ASP.NET Core API, a background Worker, PostgreSQL + pgvector, React on top. The LLM pipeline does translation, word explanations, "Ask this book" RAG, and three production agents (Enrichment, Librarian, Tutor), routed between a local Ollama and OpenAI by a config-driven router. The code is public: github.com/mrviduus/textstack.
Bug Fix or Performance Improvement
Three weeks ago a user's PDF fell through my LLM router onto a CPU-only Ollama container instead of GPT-4.1, and my CPU sat at 390% for an hour. Zero exceptions. Zero error logs. Zero alerts. And when I went to see what my existing observability had recorded, the answer was nothing at all: the OTLP exporter pointed at an Aspire dashboard container that is profile-gated and doesn't run in production. Every span my services had ever produced in prod had been fired into a closed socket.
