Sensu Leading Whitespace Removal Regex. You can test via `cat evnt.json | ruby regex.rb`

event.json

{
  "client":{
    "name": "host01",
    "address": "10.2.1.11",
    "subscriptions": [
      "all",
      "frontend",
      "proxy"
    ],
    "timestamp": 1326390159
  },
  "check":{
    "name": "frontend_http_check",
    "issued": 1326390169,
    "output": "HTTP CRITICAL: HTTP/1.1 503 Service Temporarily Unavailable",
    "status": 2,
    "command": "check_http -I 127.0.0.1 -u http://web.example.com/healthcheck.html -R 'pageok'",
    "subscribers":[
      "frontend"
    ],
    "interval": 60,
    "handler": "campfire",
    "history": [
      "0",
      "2"
    ],
    "flapping": false,
    "password": "FOOBIEBAR"
  },
  "occurrences": 1,
  "action": "create"
}

output

|ruby-1.9.3-p392@home-ec| persaeus in ~/Git Repositories/yacn
○ → cat evnt.json | ruby regex.rb
HTTP CRITICAL: HTTP/1.1 503 Service Temporarily Unavailable
Host: host01
Timestamp: 2012-01-12 12:42:49 -0500
Address: 10.2.1.11
Check Name: frontend_http_check
Command: check_http -I 127.0.0.1 -u http://web.example.com/healthcheck.html -R 'pageok'
Status: 2
Occurrences: 1


HTTP CRITICAL: HTTP/1.1 503 Service Temporarily Unavailable
Host: host01
Timestamp: 2012-01-12 12:42:49 -0500
Address: 10.2.1.11
Check Name: frontend_http_check
Command: check_http -I 127.0.0.1 -u http://web.example.com/healthcheck.html -R 'pageok'
Status: 2
Occurrences: 1

regex.rb

require 'json'

evnt = JSON.parse(STDIN.read)

def bdy(event, regex='^ {12}')
    body = <<-BODY.gsub(/#{regex}/,'')
            #{event['check']['output']}
            Host: #{event['client']['name']}
            Timestamp: #{Time.at(event['check']['issued'])}
            Address: #{event['client']['address']}
            Check Name: #{event['check']['name']}
            Command: #{event['check']['command']}
            Status: #{event['check']['status']}
            Occurrences: #{event['occurrences']}
          BODY
  return body
end

puts bdy(evnt)
puts "\n\n"
puts bdy(evnt, regex='^\s+')