Explorer and exporter were scanning the full Parquet lake every 1–5s
(~2000 files, 200MB+), driving ~2.2 CPU cores. Limit metrics to the
last N flights, cache DuckDB views and the partition tree, slow live
polls to 2s, and keep drones alive after seal to stop restart churn.
Add node-exporter, scan-duration metrics, and a Swarm Platform Grafana
dashboard for node CPU/memory and scan health.
Monitoring compose profile: dependency-free Prometheus exporter that
scans the Parquet output with DuckDB (rows, detections, pose frames,
battery, RSSI, link distance, bytes on disk), Prometheus scrape config
and a provisioned Grafana dashboard. Demonstrates the observability
doctrine: fleet statistics derived from the data platform itself.
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