gistfile1.rb

LOGFILE = "/var/log/#{PROJECT}/#{now.strftime('%Y-%m')}/#{now.strftime('%Y-%m-%d')}.production.log"
STATEFILE = "/var/lib/munin/plugin-state/rails_response_time_#{TITLE}_#{PROJECT}#{FILTER}.state"

# get the state
statefile = File.new(STATEFILE, "r")
statefile.each do |line|
  amount = line.to_i
end
statefile.close

# parse the logfile
logfile = File.new(LOGFILE, "r")
amount = 0 if logfile.stat.size < amount
logfile.seek(amount, IO::SEEK_SET)

logfile.each_line do |line|
  # do your work
end

amount = logfile.pos
logfile.close

statefile = File.new(STATEFILE, "w")
statefile.puts(amount)
statefile.close