Engineering Logs for Troubleshooting & Debugging
Jordan Lee 
Problem – ReplicaSet for Qwen Fails to Scale Under High CPU Load The production Qwen service runs behind a HorizontalPodAutoscaler (HPA) that watches CPU utilization and a custom latency metric. During traffic spikes the following symptoms were observed: CPU usage on existing pods consistently exceeds 80%. HPA reports a desired replica count (e.g., 8) but … Read more
Problem – ChromaDB Container Crash Loop on‑Premises OOM Error Deployments of ChromaDB on shared on‑premises servers often encounter a crash loop where the Docker container is repeatedly killed and restarted. Typical symptoms include: Docker daemon reports OOMKilled for the container. Health‑check failures such as HTTP 500 Internal Server Error from the /healthz endpoint. Docker logs … 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
Problem Description The controller manager pods in a multi‑region Pinecone deployment are crashing during synchronous index replication. Symptoms observed across us-east-1, eu-west-1 and ap-southeast-2 include: Pod restarts with exit code 137 (OOM kill) in the Kubernetes events. Log entries such as: 2024-05-28T14:12:03Z controller_manager: out of memory 2024-05-28T14:12:04Z replication sync failed: connection reset by peer 2024-05-28T14:12:05Z … Read more
Problem – CRD Validation Failure When Deploying NVIDIA GPU Workloads After upgrading the NVIDIA GPU Operator (or during a fresh installation) AI training pods are rejected by the Kubernetes API server with errors such as: admission webhook “validation.gpu-operator.nvidia.com” denied the request: spec.gpus: Invalid value: “”: required property “count” missing error: unable to recognize “gpu-crd.yaml”: no … Read more
Problem – Context Window Overflow When Querying Large Document Indices In a development sandbox with a 2 GB JVM heap, a scroll query against an index that stores full‑text documents (>10 MB _source per doc) fails with errors such as: [2026-05-30T12:34:56,789][WARN ][o.e.c.m.SearchContext] [node-1] search_context_missing_exception: [search_context_id] missing or expired circuit_breaking_exception: request size [6.3mb] is too large, limit is … Read more
Problem Description The Claude inference service experiences a cascade of pending pods during traffic spikes. Typical symptoms observed in the kubectl get pods -n claude-prod output are: NAME READY STATUS RESTARTS AGE claude-infer-7f9c9d8c9f-abcde 0/1 Pending 0 2m30s claude-infer-7f9c9d8c9f-fghij 0/1 Pending 0 2m30s … Relevant scheduler events (extracted from kubectl describe pod <pod>) contain the following … Read more