Munin contributed plugins

#!/usr/bin/env ruby

=begin

thin_threads -

  A munin plugin for Linux to monitor how many threads per thin process

For Linux ONLY !

DOES NOT WORK on OSX, Solaris or BSD.

only linux, because this script relies on proc filesystem

Original author:

  Frederico de Souza Araujo - fred.the.master@gmail.com

  http://www.frederico-araujo.com

Usurper:

  Adam Michel - elfurbe@furbism.com

  http://www.furbism.com

Originally based on:

  thin_process_memory -

      A munin plugin to monitor memory size of

      each individual thin process

  by Ben VandenBos and Avvo, Inc.

This program is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License version 2

as published by the Free Software Foundation.

This program is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

GNU General Public License for more details.

You should have received a copy of the GNU General Public License along

with this program; if not, write to the Free Software Foundation, Inc.,

51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

#%# family=auto

#%# capabilities=autoconf

=end

module Munin

  class ThinThreads

    def run

      instances = get_pids()

      instances.each do |instance|

        pid, port = instance.split("|")

        rss = (get_threads(pid).to_i)

        puts "thin_#{port}.value #{rss}"

      end

    end

    # only get threads count for each pid

    # Using Proc filesystem

    # ONLY LINUX! because relies on proc filesystem

    # TODO: make this work on OSX and Solaris,

    #        so the whole unix gang is happy ;)

    def get_threads(pid)

      res = `grep "Threads" /proc/#{pid}/status | cut -d ":" -f2`.gsub(/\s+/, "")

      if res.match("cannot access")

        return nil

      else

        return res

      end

    end

    # fetch all pids that match thin

    def get_pids

      pids = `pgrep -f 'thin' -l | awk -F " " '{ if (substr( $4, 10, 4)>=1) print $1"|"substr( $4, 10, 4)}' | sort -t'|' -nk 2`.split(/\r?\n/)

    end

    def autoconf

      get_pids().length > 0

    end

  end

end

mpm = Munin::ThinThreads.new

case ARGV[0]

when "config"

  puts "graph_title Thin Threads"

  puts "graph_vlabel Threads"

  puts "graph_category webserver"

  puts "graph_args -l 0"

  puts "graph_scale yes"

  puts "graph_info Tracks how many threads per thin processes"

  mpm.get_pids.each do |instance|

    pid, port = instance.split("|")

    puts "thin_#{port}.label thin_#{port}"

    puts "thin_#{port}.info Threads per Thin process"

    puts "thin_#{port}.type GAUGE"

    puts "thin_#{port}.min 0"

  end

when "autoconf"

  if mpm.autoconf

    puts "yes"

    exit 0

  end

  puts "no"

  exit 0

else

  mpm.run

end