Engineering Logs for Troubleshooting & Debugging
Problem In a development sandbox the AI‑powered query builder integrated with Grafana produces Loki queries that fail at execution time. The UI shows a “filter expression parse error” and the Loki server returns syntax‑related error messages such as: parse error at line 1: unexpected token “=” near “app=frontend” The failure occurs only for queries generated … Read more
Problem: Grafana panels show duplicated or missing data during A/B testing of dashboard versions During a staged rollout of two dashboard variants (A and B) using Grafana’s feature‑flag based A/B testing, operators observed the following symptoms: Prometheus‑based time‑series panels display each metric twice, inflating KPI values by ~100%. Loki log panels contain duplicate log entries … Read more
Problem Description Grafana dashboards that visualize real‑time model inference latency and GPU utilization are experiencing intermittent rendering latency spikes that exceed 8000 ms. The symptoms observed in the UI and logs are: Panel data request timed out after 8000 ms (Grafana UI). Grafana logs contain datasource query timeout and Failed to query datasource: context deadline exceeded. Prometheus … Read more
Problem – Grafana Dashboard Rendering Fails Under Load In a GPU‑focused LLM training cluster (64 × A100, 48 × H100 for inference) operators observed the following symptoms after adding per‑GPU DCGM metrics and reducing the dashboard refresh interval to 5s: Grafana pod repeatedly OOMKilled: panic: runtime: out of memory HTTP 504 Gateway Timeout responses from the Grafana UI. CPU … Read more
Problem Description An AI‑driven observability agent receives raw Prometheus query results and Loki log streams from Grafana during a blue‑green traffic shift. The ingestion pipeline builds a single prompt for an OpenAI LLM. When metric spikes and duplicate log streams are unbounded, the prompt exceeds the model’s token limit, producing errors such as: { “error”: … Read more
Problem – Misaligned Time‑Series and Log Visualizations In a Docker‑compose sandbox the Grafana dashboard shows a noticeable gap between Prometheus metrics and Loki logs. The time‑series panel displays metric points at the expected timestamps, while the log panel appears shifted (commonly 5 minutes, 1 hour, or a few seconds). The visual gap makes correlation impossible and leads … Read more
Problem Description – Tokenizer Encoding Errors in Grafana In a multi‑tenant machine‑learning monitoring platform hosted on AWS Managed Grafana, engineers observed intermittent failures when visualizing log and trace data sourced from Loki. The Log panel rendered a generic error message such as: panic: runtime error: invalid UTF-8 sequence in log tokenization goroutine 112 [running]: pkg/logql/lexer.go:123 … Read more
Problem Description When developing locally with Grafana’s Retrieval Augmented Generation (RAG) component, engineers often observe that queries return incomplete or empty results. The RAG backend logs messages such as: 2024-05-12T14:23:07Z WARN rag.filter – RAG metadata filter: excluded source ‘my_test_ds’ due to missing tag ‘rag_enabled’ 2024-05-12T14:23:07Z WARN rag.filter – RAG filter applied, 0 of 5 candidate … Read more