lib/arborist/monitor/snmp/cpu.rb
author Mahlon E. Smith <mahlon@martini.nu>
Wed, 04 Apr 2018 11:00:35 -0700
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parent 4 lib/arborist/monitor/snmp/load.rb@e6eb11b1e00d
child 14 d5cb8bd33170
permissions -rw-r--r--
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# -*- ruby -*-
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# vim: set noet nosta sw=4 ts=4 :
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require 'arborist/monitor/snmp' unless defined?( Arborist::Monitor::SNMP )
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# Machine load/cpu checks.
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#
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# Sets current 1, 5, and 15 minute loads under the 'load' attribute,
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# and calculates/warns on cpu overutilization.
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#
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class Arborist::Monitor::SNMP::CPU
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	include Arborist::Monitor::SNMP
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	extend Configurability, Loggability
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	log_to :arborist_snmp
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	# OIDS for discovering system load.
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	#
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	OIDS = {
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		load: '1.3.6.1.4.1.2021.10.1.3',
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		cpu:  '1.3.6.1.2.1.25.3.3.1.2'
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	}
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	# When walking load OIDS, the iterator count matches
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	# these labels.
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	#
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	LOADKEYS = {
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		1 => :load1,
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		2 => :load5,
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		3 => :load15
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	}
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	# Global defaults for instances of this monitor
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	#
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	configurability( 'arborist.snmp.cpu' ) do
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		# What overutilization percentage qualifies as a warning
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		setting :warn_at, default: 80
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	end
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	### Return the properties used by this monitor.
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	###
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	def self::node_properties
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		return USED_PROPERTIES
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	end
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	### Class #run creates a new instance and immediately runs it.
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	###
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	def self::run( nodes )
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		return new.run( nodes )
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	end
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	### Perform the monitoring checks.
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	###
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	def run( nodes )
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		super do |host, snmp|
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			self.find_load( host, snmp )
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		end
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	end
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	#########
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	protected
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	#########
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	### Return system CPU data.
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	###
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	def cpu( snmp )
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		return snmp.walk( OIDS[:cpu] )
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	end
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	### Find load data, add additional niceties for reporting.
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	###
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	def format_load( snmp )
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		info = { cpu: {}, load: {} }
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		cpus = self.cpu( snmp )
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		info[ :cpu ][ :count ] = cpus.size
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		# Windows SNMP doesn't have a concept of "load" over time,
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		# so we have to just use the current averaged CPU usage.
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		#
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		# This means that windows machines will very likely want to
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		# adjust the default "overutilization" number, considering
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		# it's really just how much of the CPU is used at the time of
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		# the monitor run, along with liberal use of the Observer "only
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		# alert after X events" pragmas.
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		#
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		if self.system =~ /windows\s+/i
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			info[ :cpu ][ :usage ] = cpus.values.inject( :+ ).to_f / cpus.size
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			info[ :message ] = "System is %0.1f%% in use." % [ info[ :cpu ][ :usage ] ]
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		# UCDavis stuff is better for alerting only after there has been
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		# an extended load event.  Use the 5 minute average to avoid
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		# state changes on transient spikes.
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		#
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		else
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			snmp.walk( OIDS[:load] ).each_with_index do |(_, value), idx|
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				next unless LOADKEYS[ idx + 1 ]
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				info[ :load ][ LOADKEYS[idx + 1] ] = value.to_f
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			end
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			percentage = (( ( info[:load][ :load5 ] / cpus.size ) - 1 ) * 100 ).round( 1 )
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			if percentage < 0
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				info[ :message ] = "System is %0.1f%% idle." % [ percentage.abs ]
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				info[ :cpu ][ :usage ] = percentage + 100
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			else
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				info[ :message ] = "System is %0.1f%% overloaded." % [ percentage ]
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				info[ :cpu ][ :usage ] = percentage
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			end
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		end
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		return info
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	end
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	### Collect the load information for +host+ from an existing
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	### (and open) +snmp+ connection.
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	###
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	def find_load( host, snmp )
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		info = self.format_load( snmp )
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		config  = identifiers[ host ].last || {}
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		warn_at = config[ 'warn_at' ] || self.class.warn_at
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		usage   = info.dig( :cpu, :usage ) || 0
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		if usage >= warn_at
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			info[ :warning ] = "%0.1f utilization exceeds %0.1f percent" % [ usage, warn_at ]
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		end
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		self.results[ host ] = info
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	end
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end # class Arborist::Monitor::SNMP::CPU
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