contrib-munin/plugins/passenger/passenger_processes

#!/usr/bin/env ruby
#
# [passenger_processes]
# user root
# env.process_stats_command /opt/ruby-enterprise-1.8.6-20080810/bin/passenger-status
#

process_stats_command = ENV['process_stats_command'] || '/opt/ruby-enterprise-1.8.6-20080810/bin/passenger-status'

if ARGV.length > 0 && ARGV[0] == 'config'
  puts "graph_title Passenger Processes"
  puts "graph_category webserver"
  puts "graph_vlabel processes"
  puts "max.label Max processes"
  puts "count.label Total processes"
  puts "active.label Active processes"
  puts "queued.label Queued requests"
  exit(0)
end

max = nil
count = nil
active = nil
queued = nil

`#{process_stats_command}`.each_line do |line|
  if /max\s+=\s+(\d+)/.match(line)
    max = $~[1]
  elsif /count\s+=\s+(\d+)/.match(line)
    count = $~[1]
  elsif /^active\s+=\s+(\d+)/.match(line)
    active = $~[1]
  elsif /Waiting on global queue\s+=\s+(\d+)/.match(line)
    queued = $~[1]
  end
end

puts "max.value #{max}"
puts "count.value #{count}"
puts "active.value #{active}"
puts "queued.value #{queued.to_i}"