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docs/Monitoring-Stack.md

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+# Monitoring Stack
+
+Prometheus, Grafana, cAdvisor, and node-exporter running together give full visibility into both the host and every container on it — essential on modest hardware where knowing what's consuming resources matters.
+
+## Components
+
+- **Prometheus** — scrapes and stores time-series metrics from every target below
+- **node-exporter** — exposes host-level metrics (CPU, memory, disk, network)
+- **cAdvisor** — exposes per-container resource usage
+- **Grafana** — dashboards on top of Prometheus data
+
+## Prometheus targets
+
+All scrape targets healthy and reporting:
+
+![Prometheus targets](images/prometheus-targets.png)
+
+## Grafana: Node Exporter Full dashboard
+
+Host-level metrics — CPU, memory, swap, disk, and network — over a rolling 24-hour window:
+
+![Grafana Node Exporter dashboard](images/grafana-node-exporter.png)
+
+## Why this matters
+
+On a lower-spec host, resource headroom is limited. Having per-container and host-level metrics from day one means a runaway container or a creeping memory leak shows up on a dashboard before it takes the box down — instead of finding out from an outage.