estats - A minimal metric retrieval system

A CLI tool which polls:

• Load average values
• Derived CPU percentage values
• Network interface statistics
• Disk partition usage in percent
• Memory usage in percent

Linux only. May work on other *nix, but untested.

Build:

This is a Go tool with no external dependencies. To build the project run:

git checkout https://github.com/kobajagi/estats.git && cd estats
go build

How to use:

Usage:
  estats [OPTION...]
Options:
  -i int
    	interval in seconds at which to poll (default 5)
  -n string
    	network interface to poll
  -p string
    	disk partition to poll

If -n or -p options are not specified, corresponding metrics will not print. To specify disk partition, specify any file or folder path within that partition (as expected by statfs).

Tool output is in (compact) JSON format, piped through jq it looks like this (single poll):

$ ./estats -n wlp2s0 -i 1 -p /home | jq

{
  "timestamp": 1642633633,
  "metrics": [
    {
      "name": "disk usage (%)",
      "metric": 8
    },
    {
      "name": "loadavg 1m",
      "metric": "0.29"
    },
    {
      "name": "loadavg 5m",
      "metric": "0.24"
    },
    {
      "name": "loadavg 15m",
      "metric": "0.33"
    },
    {
      "name": "cpu usage (%)",
      "metric": 5
    },
    {
      "name": "download (bytes)",
      "metric": 494800992
    },
    {
      "name": "upload (bytes)",
      "metric": 20615508
    },
    {
      "name": "memory usage (%)",
      "metric": 39
    }
  ]
}

Errors during polling are printed to stderr and do not stop the polling process. Stop tool using CTRL+c.