metrics-memory-percent.rb
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#! /usr/bin/env ruby
# encoding: UTF-8
#
# metrics-memory-percent
#
# DESCRIPTION:
#
# OUTPUT:
# metric data
#
# PLATFORMS:
# Linux
#
# DEPENDENCIES:
# gem: sensu-plugin
#
# USAGE:
# ./metrics-memory-percent.rb
#
# 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'
class MemoryGraphite < 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}.memory_percent"
def run
# Based on memory-metrics.rb
# Metrics borrowed from hoardd: https://github.com/coredump/hoardd
mem = metrics_hash
mem.each do |k, v|
output "#{config[:scheme]}.#{k}", v
end
ok
end
def metrics_hash
mem = {}
memp = {}
meminfo_output.each_line do |line|
mem['total'] = line.split(/\s+/)[1].to_i * 1024 if line =~ /^MemTotal/
mem['free'] = line.split(/\s+/)[1].to_i * 1024 if line =~ /^MemFree/
mem['buffers'] = line.split(/\s+/)[1].to_i * 1024 if line =~ /^Buffers/
mem['cached'] = line.split(/\s+/)[1].to_i * 1024 if line =~ /^Cached/
mem['swapTotal'] = line.split(/\s+/)[1].to_i * 1024 if line =~ /^SwapTotal/
mem['swapFree'] = line.split(/\s+/)[1].to_i * 1024 if line =~ /^SwapFree/
mem['dirty'] = line.split(/\s+/)[1].to_i * 1024 if line =~ /^Dirty/
end
mem['swapUsed'] = mem['swapTotal'] - mem['swapFree']
mem['used'] = mem['total'] - mem['free']
mem['usedWOBuffersCaches'] = mem['used'] - (mem['buffers'] + mem['cached'])
mem['freeWOBuffersCaches'] = mem['free'] + (mem['buffers'] + mem['cached'])
# to prevent division by zero
swptot = if mem['swapTotal'].zero?
1
else
mem['swapTotal']
end
mem.each do |k, _v|
# with percentages, used and free are exactly complementary
# no need to have both
# the one to drop here is "used" because "free" will
# stack up neatly to 100% with all the others (except swapUsed)
# #YELLOW
memp[k] = 100.0 * mem[k] / mem['total'] if k != 'total' && k !~ /swap/ && k != 'used'
# with percentages, swapUsed and swapFree are exactly complementary
# no need to have both
memp[k] = 100.0 * mem[k] / swptot if k != 'swapTotal' && k =~ /swap/ && k != 'swapFree'
end
memp
end
def meminfo_output
File.open('/proc/meminfo', 'r')
end
end