old_contents: (function() {
    return {
      librato: {
        email: process.env.LIBRATO_EMAIL,
        token: process.env.LIBRATO_TOKEN,
        tags: { dyno: process.env.DYNO }
      }
      , backends: ["statsd-librato-backend"]
      , port: 8125
      , keyNameSanitize: false
      , deleteIdleStats: true
    };
  })()
  
new_contents: (function() {
    return {
      librato: {
        email: process.env.LIBRATO_EMAIL,
        token: process.env.LIBRATO_TOKEN
      }
      , backends: ["statsd-librato-backend"]
      , port: 8125
      , keyNameSanitize: false
      , deleteIdleStats: true
    };
  })()
  
subject: Remove unused DYNO variable This variable was provided by heroku when the project first started.