fix heartbeat in all rrd files to 120 seconds

fix_heartbeat.rb

#!/usr/bin/env ruby

# ds[value].minimal_heartbeat = 120

heartbeat = "120"

file = ARGV[0]
info = `rrdtool info '#{file}' | grep minimal_heartbeat`

puts "examining #{file}"
info.split("\n").each {|line|
  ds = line.split('[', 2).last.split(']', 2).first
  old_heartbeat = line.split('= ', 2).last
  if old_heartbeat == heartbeat
    puts "#{ds} matches desired heartbeat of #{heartbeat} already, skipping"
  else
    puts "#{ds} has heartbeat of #{old_heartbeat}, setting to #{heartbeat}"
    system("rrdtool tune '#{file}' --heartbeat #{ds}:120")
  end
}