Feat/n8n stdout log#12
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- Enable n8n Prometheus metrics (N8N_METRICS, queue metrics) on main + worker, scrape via new prometheus n8n job, visualize with Grafana dashboard 24474. - Add Grafana Alloy service to ship all container stdout/stderr to Loki. - Re-source nvidia/arm64 DCGM exporter to nvcr.io (multi-arch, avoids Docker Hub rate limits); amd continues using the ROCm exporter. Applied identically across nvidia/amd/arm64-compose-stack.
Add a Loki "n8n stdout logs" panel under a new Logs row at the bottom of n8n.json (all three stacks), so n8n logs are visible next to its metrics without needing Explore. Existing metric panels are unchanged.
Set N8N_LOG_FORMAT=json on n8n-main/n8n-worker so stdout is one JSON object per line, and add a loki.process "n8n_json" stage (scoped to compose_service=~"n8n-.*") that extracts level/timestamp and promotes only the low-cardinality level label before forwarding to Loki write.
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