metrics

currently open file descriptors: node_filefd_allocated{node=~"$node"}

cpu usage rate: 100 - (avg(irate(node_cpu_seconds_total{instance=~"$node",mode="idle"}[5m])) * 100)

cpu iowait (5m): avg(irate(node_cpu_seconds_total{instance=~"$node",mode="iowait"}[5m])) * 100

memory usage: (1 - (node_memory_MemAvailable_bytes{instance=~"$node"} / (node_memory_MemTotal_bytes{instance=~"$node"})))* 100

tcp stats:

node_sockstat_TCP_tw{instance=~'$node'}
irate(node_netstat_Tcp_ActiveOpens{instance=~'$node'}[1m])
irate(node_netstat_Tcp_PassiveOpens{instance=~'$node'}[1m])
node_sockstat_TCP_alloc{instance=~'$node'}
node_sockstat_TCP_inuse{instance=~'$node'}


add the piechart plugin to grafana: grafana-cli plugins install grafana-piechart-panel