Prometheus
CPU IOWAIT
irate(node_cpu_seconds_total{mode="iowait"}[5m])
CPU LOAD
100 - avg(irate(node_cpu_seconds_total{mode="idle"}[5m])) without(cpu) * 100
Free filesystem space
(node_filesystem_avail_bytes / node_filesystem_size_bytes) * 100
Incoming bandwidth
sum ithout (device) (rate(node_network_receive_bytes_total{device!="lo"}[30s])) * 8