Lessons on monitoring

• Watch the foundation first. The Proxmox host's CPU/RAM/disk is the most important thing to graph — everything else depends on it staying healthy.
• Learn the universal shape: source → time-series DB → dashboards. InfluxDB or Prometheus, the pattern is the same.
• One Grafana, many data sources. Putting metrics and logs behind one pane turns incident investigation into a single workflow.
• Set it up before you need it. Monitoring you add after an outage is monitoring you didn't have during the outage.