check_load.rb with debugging output

check-load-debug.rb

#!/usr/bin/env ruby
#
# Check Linux system load
# ===
#
# Copyright 2012 Sonian, Inc <[email protected]>
#
# Released under the same terms as Sensu (the MIT license); see LICENSE
# for details.

# rubocop:disable HandleExceptions

require 'rubygems' if RUBY_VERSION < '1.9.0'
require 'sensu-plugin/check/cli'

class LoadAverage
  def initialize(per_core = false)
    puts "Getting load average (per_core=#{per_core})"
    @cores = per_core ? cpu_count : 1
    puts "Using #{@cores} cores"
    begin
      la = File.read('/proc/loadavg').split.take(3)
      @avg = la.map {|a| (a.to_f / @cores).round(2) }
    rescue Exception => e
      puts "Error getting LA: #{e}"
      @avg = nil
    end
  end
  def cpu_count
    begin
      return `grep -sc ^processor /proc/cpuinfo`.to_i
    rescue Exception => e
      puts "Error getting CPU Count"
    end
    return 0
  end
  def failed?
    puts "Avg is nil" if @avg.nil?
    puts "No cores found" if @cores.zero?
    @avg.nil? || @cores.zero?
  end
  def exceed?(thresholds)
    @avg.zip(thresholds).any? {|a, t| a > t }
  end
  def to_s
    @avg.join(', ')
  end
end

class CheckLoad < Sensu::Plugin::Check::CLI

  option :warn,
    :short => '-w L1,L5,L15',
    :long => '--warn L1,L5,L15',
    :description => 'Load WARNING threshold, 1/5/15 min average',
    :proc => proc {|a| a.split(',').map {|t| t.to_f } },
    :default => [10, 20, 30]

  option :crit,
    :short => '-c L1,L5,L15',
    :long => '--crit L1,L5,L15',
    :description => 'Load CRITICAL threshold, 1/5/15 min average',
    :proc => proc {|a| a.split(',').map {|t| t.to_f } },
    :default => [25, 50, 75]

  option :per_core,
    :short => '-p',
    :long => '--per-core',
    :description => 'Divide load average results by cpu/core count',
    :boolean => 'true',
    :default => false

  def run
    avg = LoadAverage.new(config[:per_core])
    warning "Could not read load average from /proc" if avg.failed?
    message "Load average: #{avg}"
    critical if avg.exceed?(config[:crit])
    warning if avg.exceed?(config[:warn])
    ok
  end

end