Observed Signal · Jul 25, 2026 · Technical Release · Source: DEV Community · Impact: 2/5 · Sentiment: Positive
Observability for Self‑Hosted LLMs with SigNoz
A technical case study by Shivani Bhati describing a self-hosted LLM observability and FinOps pipeline. The author converted a Kaggle T4 GPU running vLLM (Qwen 1.5B) into an enterprise-ready system, built a FastAPI FinOps & SLO gateway, a pynvml-based hardware exporter for NVIDIA GPU telemetry, and batched telemetry through the OpenTelemetry Collector into SigNoz Cloud. The setup enforces a 2.0s latency SLA, visualizes token-level cost per team via PromQL, and triggers Slack alerts when error budgets breach thresholds. A multi-threaded load generator and a “poison pill” prompt were used to validate detection of hallucination loops and resource bottlenecks.
Practical demonstration of observability and FinOps techniques for self-hosted LLM inference — useful for engineering teams running foundation models but not industry-shifting.
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Key Takeaways & Evidence Grounding
- Author built an SRE Copilot and FinOps Gateway and used SigNoz Cloud as the observability backend.
- The system ran vLLM with the Qwen 1.5B model on a Kaggle T4 GPU.
- A custom hardware exporter using pynvml scraped NVIDIA GPU power, temperature, and memory metrics from the Kaggle kernel.
- Telemetry was batched via the OpenTelemetry Collector and shipped into SigNoz Cloud; PromQL queries were used to compute token-level USD costs per team.
- PromQL alert rules were configured to notify a Slack channel when the SLA Error Budget breached zero; a multi-threaded load generator and a 'poison pill' prompt were used to validate detection of hallucination loops and OOM/bottleneck conditions.
Connected Companies & Entities
6 Entities mapped“I built an SRE Copilot and FinOps Gateway, but the real superhero of this architecture is SigNoz Cloud....”
“Hardware Exporter (pynvml): A custom script scraping raw NVIDIA GPU Power, Temperature, and Memory Utilization directly from the Kaggle kern...”
“When moving from external APIs (like OpenAI) to self-hosted open-source models, developers hit a wall: AI infrastructure is a black box....”
“I configured PromQL Alert Rules so my Slack channel is instantly pinged when the Error Budget breaches zero....”
“DEV Community — A space to discuss and keep up software development and manage your software career...”
Ontology Mapping & Concepts
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