{ pkgs, lib }:
let
  inherit (import ./helpers.nix { inherit pkgs lib; })
    T
    mkRow
    mkStat
    mkGauge
    mkTs
    mkDashboard
    ;
in
mkDashboard {
  name = "host.json";
  title = "Host";
  uid = "host";
  panels = [

    (mkRow "Overview")
    (mkGauge {
      title = "CPU";
      expr = ''100 * (1 - avg(rate(node_cpu_seconds_total{mode="idle"}[5m])))'';
    })
    (mkGauge {
      title = "Memory used";
      expr = "100 * (1 - node_memory_MemAvailable_bytes / node_memory_MemTotal_bytes)";
    })
    (mkStat {
      title = "Load (1m)";
      unit = "short";
      decimals = 2;
      expr = "node_load1";
    })
    (mkStat {
      title = "Load (5m)";
      unit = "short";
      decimals = 2;
      expr = "node_load5";
    })
    (mkStat {
      title = "Uptime";
      unit = "dtdurations";
      decimals = 0;
      expr = "node_time_seconds - node_boot_time_seconds";
    })

    (mkRow "CPU")
    (mkTs {
      title = "CPU usage (%)";
      unit = "percent";
      targets = [
        (T ''avg(rate(node_cpu_seconds_total{mode="user"}[5m]))    * 100'' "user")
        (T ''avg(rate(node_cpu_seconds_total{mode="system"}[5m]))  * 100'' "system")
        (T ''avg(rate(node_cpu_seconds_total{mode="iowait"}[5m]))  * 100'' "iowait")
        (T ''avg(rate(node_cpu_seconds_total{mode="steal"}[5m]))   * 100'' "steal")
        (T ''avg(rate(node_cpu_seconds_total{mode="softirq"}[5m])) * 100'' "softirq")
      ];
    })
    (mkTs {
      title = "Per-core usage (%)";
      unit = "percent";
      targets = [
        (T ''(1 - rate(node_cpu_seconds_total{mode="idle"}[5m])) * 100'' "cpu{{cpu}}")
      ];
    })
    (mkTs {
      title = "CPU temperatures";
      unit = "celsius";
      targets = [
        (T "node_hwmon_temp_celsius" "{{chip}} {{sensor}}")
      ];
    })
    (mkTs {
      title = "Load average";
      targets = [
        (T "node_load1" "1m")
        (T "node_load5" "5m")
        (T "node_load15" "15m")
      ];
    })

    (mkRow "Memory")
    (mkTs {
      title = "Memory";
      unit = "bytes";
      targets = [
        (T "node_memory_MemTotal_bytes - node_memory_MemAvailable_bytes" "used")
        (T "node_memory_Cached_bytes + node_memory_Buffers_bytes" "cache + buffers")
        (T "node_memory_MemAvailable_bytes" "available")
        (T "node_memory_MemTotal_bytes" "total")
      ];
    })
    (mkTs {
      title = "Swap";
      unit = "bytes";
      targets = [
        (T "node_memory_SwapTotal_bytes - node_memory_SwapFree_bytes" "used")
        (T "node_memory_SwapTotal_bytes" "total")
      ];
    })

    (mkRow "Disk")
    (mkTs {
      title = "Filesystem usage (%)";
      unit = "percent";
      targets = [
        (T ''100 * (1 - node_filesystem_avail_bytes{fstype=~"btrfs|ext4|xfs|vfat|f2fs"} / node_filesystem_size_bytes{fstype=~"btrfs|ext4|xfs|vfat|f2fs"})'' "{{mountpoint}}")
      ];
    })
    (mkTs {
      title = "Disk IO (bytes/s)";
      unit = "Bps";
      targets = [
        (T ''rate(node_disk_read_bytes_total{device!~"loop.*"}[5m])'' "{{device}} read")
        (T ''rate(node_disk_written_bytes_total{device!~"loop.*"}[5m])'' "{{device}} write")
      ];
    })
    (mkTs {
      title = "Disk IO utilisation (%)";
      unit = "percent";
      targets = [
        (T ''rate(node_disk_io_time_seconds_total{device!~"loop.*"}[5m]) * 100'' "{{device}}")
      ];
    })

    (mkRow "Network")
    (mkTs {
      title = "Network (bytes/s)";
      unit = "Bps";
      targets = [
        (T ''rate(node_network_receive_bytes_total{device!~"lo|br-.*|vh-.*|vc-.*"}[5m])'' "{{device}} rx")
        (T ''rate(node_network_transmit_bytes_total{device!~"lo|br-.*|vh-.*|vc-.*"}[5m])'' "{{device}} tx")
      ];
    })
    (mkTs {
      title = "Network errors + drops (pps)";
      targets = [
        (T ''rate(node_network_receive_errs_total{device!~"lo|br-.*|vh-.*|vc-.*"}[5m])'' "{{device}} rx err")
        (T ''rate(node_network_transmit_errs_total{device!~"lo|br-.*|vh-.*|vc-.*"}[5m])'' "{{device}} tx err")
        (T ''rate(node_network_receive_drop_total{device!~"lo|br-.*|vh-.*|vc-.*"}[5m])'' "{{device}} rx drop")
        (T ''rate(node_network_transmit_drop_total{device!~"lo|br-.*|vh-.*|vc-.*"}[5m])'' "{{device}} tx drop")
      ];
    })

    (mkRow "System")
    (mkTs {
      title = "Context switches + forks (ops/s)";
      targets = [
        (T "rate(node_context_switches_total[5m])" "context switches")
        (T "rate(node_forks_total[5m])" "forks")
      ];
    })
    (mkTs {
      title = "File descriptors";
      targets = [
        (T "node_filefd_allocated" "allocated")
        (T "node_filefd_maximum" "limit")
      ];
    })
    (mkTs {
      title = "Processes";
      targets = [
        (T "node_procs_running" "running")
        (T "node_procs_blocked" "blocked on IO")
      ];
    })
  ];
}