Sensu Event Status as Graphite Metric

check-to-metric-mutator.rb

#!/usr/bin/env ruby
#
# Author: Toby Jackson
# Date: 2015-08-11
#
# Usage:
#   Add as mutator to a graphitehandler (which accepts all severities)
#  to create a new graphite metric for $hostname.$checkname with
# each status value

require 'rubygems'
require 'json'

# Read the JSON event data from STDIN.
event = JSON.parse(STDIN.read, :symbolize_names => true)

puts "#{event[:client][:name]}.#{event[:check][:name]} #{event[:check][:status]} #{event[:check][:executed]}"

check-to-metrics-mutator.json

{
  "mutators": {
    "check-to-metrics-mutator": {
      "command": "/etc/sensu/mutators/check-to-metric-mutator.rb"
    }
  }
}

check-to-metrics.json

{
    "handlers": {
        "check-to-metrics": {
            "mutator": "check-to-metrics-mutator",
            "severities": [
                "ok",
                "warning",
                "critical",
                "unknown"
            ],
            "socket": {
                "host": "graphite.example.com",
                "port": 2003
            },
            "type": "tcp"
        }
    }
}