Install and configure Node Exporter
wget -q -O node_exporter.sh https://gist.githubusercontent.com/CrazySerGo/5b3d58f6c071f6da565deaa22e25df6e/raw/b680bb1a04cb4f3246d15c6096713d608e438526/node_exporter.sh
chmod +x node_exporter.sh
Allow access from monitoring host
ufw allow from X.X.X.X proto tcp to any port 9100
Monitoring host has installed grafana with alert manager.