--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/arborist/monitor/snmp/load.rb	Wed Sep 07 15:23:42 2016 -0700
@@ -0,0 +1,82 @@
+# -*- ruby -*-
+# vim: set noet nosta sw=4 ts=4 :
+
+require 'arborist/monitor/snmp' unless defined?( Arborist::Monitor::SNMP )
+
+# SNMP 5 minute load checks.
+# Sets current 5 minute load as a 'load5' attribute.
+#
+class Arborist::Monitor::SNMP::Load
+	include Arborist::Monitor::SNMP
+
+	extend Loggability
+	log_to :arborist
+
+	# OIDS for discovering system load.
+	#
+	LOAD = {
+		five_min: '1.3.6.1.4.1.2021.10.1.3.2'
+	}
+
+	# Global defaults for instances of this monitor
+	#
+	DEFAULT_OPTIONS = {
+		error_at: 7
+	}
+
+
+	### Class #run creates a new instance.
+	###
+	def self::run( nodes )
+		return new.run( nodes )
+	end
+
+
+	### Create a new instance of this monitor.
+	###
+	def initialize( options=DEFAULT_OPTIONS )
+		options = DEFAULT_OPTIONS.merge( options || {} )
+		options.each do |name, value|
+			self.public_send( "#{name.to_s}=", value )
+		end
+	end
+
+	# Set an error if mount points are above this percentage.
+	attr_accessor :error_at
+
+
+	### Perform the monitoring checks.
+	###
+	def run( nodes )
+		super do |snmp, host|
+			self.gather_load( snmp, host )
+		end
+	end
+
+
+	#########
+	protected
+	#########
+
+	### Collect the load information for +host+ from an existing
+	### (and open) +snmp+ connection.
+	###
+	def gather_load( snmp, host )
+		self.log.debug "Getting system load for: %s" % [ host ]
+		load5 = snmp.get( SNMP::ObjectId.new( LOAD[:five_min] ) ).varbind_list.first.value.to_f
+		self.log.debug "  Load on %s: %0.2f" % [ host, load5 ]
+
+		config = @identifiers[ host ].last || {}
+		error_at = config[ 'error_at' ] || self.error_at
+		if load5 >= error_at
+			@results[ host ] = {
+				error: "Load has exceeded %0.2f over a 5 minute average" % [ error_at ],
+				load5: load5
+			}
+		else
+			@results[ host ] = { load5: load5 }
+		end
+	end
+
+end # class Arborist::Monitor::SNMP::Load
+