roles/proxmox_upgrade/ defaults/main.yml ← all vars with defaults tasks/ main.yml ← entry point, calls preflight then loops nodes node_upgrade.yml ← per-node: backup → drain → upgrade → restore preflight.yml ← cluster health check, abort if unhealthy drain.yml ← classify guests, trigger migrations upgrade.yml ← apt dist-upgrade, reboot, wait for rejoin restore.yml ← optional migrate-back playbooks/proxmox_upgrade.yml