bin/metrics-cpu-mpstat.rb
#! /usr/bin/env ruby
#
# cpu-mpstat-metrics
#
# DESCRIPTION:
# Uses the linux/kstat rubygem to do the hard work in /proc/stat
# includes individual cpu and overall cpu usage
#
# OUTPUT:
# metric data
#
# PLATFORMS:
# Linux
#
# DEPENDENCIES:
# gem: sensu-plugin
# gem: linux/kstat
#
# USAGE:
#
# NOTES:
#
# LICENSE:
# Copyright 2012 Sonian, Inc <chefs@sonian.net>
# Released under the same terms as Sensu (the MIT license); see LICENSE
# for details.
#
require 'sensu-plugin/metric/cli'
require 'socket'
require 'linux/kstat'
#
# CPU Graphite
#
class CpuGraphite < Sensu::Plugin::Metric::CLI::Graphite
option :scheme,
description: 'Metric naming scheme, text to prepend to metric',
short: '-s SCHEME',
long: '--scheme SCHEME',
default: "#{Socket.gethostname}.cpu"
def acquire_mpstats
kstat = Linux::Kstat.new
mpstat = {}
i = ''
until kstat[:"cpu#{i}"].nil?
mpstat[:"cpu#{i}"] = kstat[:"cpu#{i}"]
if i == ''
i = 0
else
i += 1
end
end
mpstat
end
def delta_cpu_metrics(baseline_cpus, sample_cpus)
delta_cpus = {}
baseline_cpus.each do |cpu, columns|
delta_cpus[:"#{cpu}"] = {}
columns.each do |task, time|
delta_cpus[:"#{cpu}"][:"#{task}"] = sample_cpus[:"#{cpu}"][:"#{task}"] - time
end
end
delta_cpus
end
def run
baseline_cpus = acquire_mpstats
# measure for a second then get the deltas in jiffies
sleep(1)
sample_cpus = acquire_mpstats
delta_cpus = delta_cpu_metrics(baseline_cpus, sample_cpus)
cpu_count = sample_cpus.length - 1
delta_cpus.each_pair do |cpu, columns|
# assumes architecture's jiffie is 1/100th of a second
columns.each_pair do |task, time|
# #YELLOW
time = time / cpu_count if cpu.to_s == 'cpu' # rubocop:disable Style/SelfAssignment
output "#{config[:scheme]}.#{cpu}.#{task}", time
end
end
ok
end
end