passenger memory stats for munin

passenger_memory_stats

#!/usr/bin/env ruby
# by Daniel Paulus | 27 - 10 - 2011
#
# put in /etc/munin/plugins/passenger_memory_stats
# chmod a+x /usr/share/munin/plugins/passenger_memory_stats
#
# add this to /etc/munin/plugin-conf.d/munin-node:
# [passenger_*]
# user root
# command ruby %c
#
# restart munin-node
 
def output_config
  puts <<-END
graph_category Passenger
graph_title Passenger memory stats 
graph_vlabel count

memory.label memory
END
  exit 0
end
 
def output_values
  status = `/home/rails/.rvm/gems/ree-1.8.7-2011.03/gems/passenger-3.0.7/bin/passenger-memory-stats | tail -1` 
  unless $?.success?
    $stderr.puts "failed executing passenger-memory-stats"
    exit 1
  end
  status =~ /(\d+\.\d+)/
  puts "memory.value #{$1}"
end
 
if ARGV[0] == "config"
  output_config
else
  output_values
end