[chef] environments within nagios

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I've created (2) roles:

development.rb

name "development"
description "Nodes in the development environment."
default_attributes(
  "app_environment" => "development"



production.rb

name "production"
description "Nodes in the production environment."
default_attributes(
  "app_environment" => "production"
)


When I deployed a development nagios server, it added all the required hosts
while giving it the "development" role. However, when i deployed a production
nagios server, it ALSO added the "development" role servers. In theory, this
should be empty since I have never rolled out a client server with a
"production" role. What am I doing wrong here? 

I did notice that when i did knife node edit, it shows the default 
environment:

{
  "name": "localhost.localdomain",
  "chef_environment": "_default",
  "normal": {
    "tags": [

    ]
  },
  "run_list": [
    "role[monitoring]",
    "role[production]",
    "role[localhost]",
    "role[base_linux]"
  ]
}