Munin contributed plugins

#!/usr/bin/env ruby

def output_config

  puts <<~END

    graph_category webserver

    graph_title status

    graph_vlabel count

    graph_info This graph shows how much passenger process are working, available and how much queries are waiting.

    max.label max processes

    max.draw AREA

    max.info Maximum processes allowed to run simultaneously.

    sessions.label queued requests

    sessions.draw LINE2

    sessions.info Requests queued, waiting to be processed.

    running.label running processes

    running.draw LINE1

    running.info The number of application instances that are currently alive.

    active.label active processes

    active.draw LINE1

    active.info The number of application instances that are currently processing requests.

    waiting.label waiting requests

    waiting.draw LINE2

    waiting.info Requests waiting to be queued.

  END

  exit 0

end

def output_values

  status = `sudo passenger-status`

  unless $?.success?

    $stderr.puts "failed executing passenger-status"

    exit 1

  end

  status =~ /max\s+=\s+(\d+)/

  puts "max.value #{$1}"

  status =~ /count\s+=\s+(\d+)/

  puts "running.value #{$1}"

  status =~ /active\s+=\s+(\d+)/

  puts "active.value #{$1}"

  status =~ /Waiting on global queue:\s+(\d+)/

  puts "waiting.value #{$1}"

  total_sessions = 0

  status.scan(/Sessions: (\d+)/).flatten.each { |count| total_sessions += count.to_i }

  puts "sessions.value #{total_sessions}"

end

if ARGV[0] == "config"

  output_config

else

  output_values

end