Typo in nginx example.
MODIFY
recipes/nginx.rb
recipes/nginx.rb
@@ -19,7 +19,7 @@ include_recipe 'datadog::dd-agent'
# 'ssl_validation' => false,
# 'skip_proxy' => false,
# 'use_plus_api' => false,
-# 'plus_api_version' => "2"
+# 'plus_api_version' => 2,
# 'use_vts' => false
# }
# ]

Typo in nginx example.