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A Bash-first, open-source playbook to modernize VM monitoring: instrument guests (qemu-guest-agent, sysstat, Node Exporter), centralize with Prometheus and Grafana, and add a lightweight Python Isolation Forest to detect CPU, memory, and I/O anomalies; automate via systemd/cron. Includes apt/dnf/zypper installs, PromQL examples, and practical steps for early, low-noise alerts—no proprietary tools required.