From https://www.stathat.com/examples/WyUF

stathat-file-sizes

#!/usr/bin/env ruby

require 'rubygems'
require 'stathat'

FILES = [["/opt/local/var/db/buckets.tct", "somekeyforstat1"],
        ["/opt/local/var/db/stats.tct", "somekeyforstat2"],
        ["/opt/local/var/db/users.tct", "somekeyforstat3"]]
        
FILES.each do |elts|
        StatHat::API.post_value(elts[1], 'youruserkey', File.size(elts[0]))
end