initial commit: geekworm x1208 ups prometheus exporter

monitoring-overlay/README.md

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+# Monitoring overlay for the Pi
+
+These two files are the desired state of `/home/mokhtar/app/monitoring/` on the Pi
+after the X1208 exporter is in place. The `.original` siblings are snapshots of
+what's there right now (pulled with `ssh rpi cat ...`).
+
+## Diff summary
+
+**`compose.yaml`** — node-exporter service:
+
+- Add volume `/var/lib/node-exporter/textfiles:/textfiles:ro`
+- Add command flag `--collector.textfile.directory=/textfiles`
+
+**`prometheus.yaml`** — global block:
+
+- Add `external_labels: { host: rpi }` so metrics are tagged in Grafana Cloud
+  (instead of relying on the Docker service name as `instance`).
+
+## Apply
+
+```bash
+scp compose.yaml prometheus.yaml rpi:/home/mokhtar/app/monitoring/
+ssh rpi 'cd /home/mokhtar/app/monitoring && docker compose up -d'
+```
+
+This recreates the node-exporter container (~2s blip) and reloads Prometheus.