metrics

gistfile1.rb

require 'json'

def metrics(values, keys)
  Hash[keys.zip(values)]
end

values = %x[free -m].match(/cache:\s+(\d+)\s+(\d+)\n/).captures
keys = ["memory-buffers", "memory-cached"]

data = metrics(values, keys)

values = File.read('/proc/loadavg').match(/^(\d+\.\d{2}) (\d+\.\d{2}) (\d+\.\d{2})/).captures
keys = ["load-1", "load-5", "load-15"]
data.update(metrics(values, keys))

filesystems = %x[df -P].split("\n").reject { |lines| lines =~ /1024-blocks|tmpfs/ }
filesystems.each do |fs|
  values = fs.match(/^(.+?)\s+(\d+)\s+(\d+)\s+(\d+)\s+(\d+)\%\s+(.+)$/).captures
  name = values.shift.gsub('/', '-')
  keys = ["fs#{name}-size", "fs#{name}-used", "fs#{name}-free", "fs#{name}-%-used", "fs#{name}-mountpoint"]
  data.update(metrics(values, keys))
end

puts data.to_json