#!/usr/bin/env bash

printf '{\"time\":\"%(%Y-%m-%dT%H:%M:%S%z)T\",' -1
grep 'cpu ' /proc/stat | awk '{usage=($2+$4)/($2+$4+$5)} END {printf("\"cpuPercent\":%f,", usage)}'
awk '{load=$1} END {printf("\"load\":%f,", load)}' /proc/loadavg
awk '
/^MemTotal:/ {
        mem_total=$2
}
/^MemFree:/ {
        mem_free=$2
}
/^Buffers:/ {
        mem_free+=$2
}
/^Cached:/ {
        mem_free+=$2
}
/^SwapTotal:/ {
        swap_total=$2
}
/^SwapFree:/ {
        swap_free=$2
}
END {
           used=(mem_total-mem_free)
           total=mem_total

           pct=0
           if (total > 0) {
                   pct=used/total
           }

           # full text
           printf("\"memUsed\":%d,\"memTotal\":%d,\"memPercent\":%f,", used, total, pct)
   }
   ' /proc/meminfo
df | grep '/dev/nvme1n1p3' | awk '{usage=(1-($4/$2))} END {printf("\"disk01\":%f,", usage)}'
awk '{printf("\"secondsUp\":%d", $1)}' /proc/uptime
echo '}'