python wrapper docs: move metadata entry to incubating

doc/source/python/python_component.md

@@ -148,9 +148,6 @@ class ModelWithMetrics(object):
     	return {"system":"production"}
 ```
 
-## REST Metadata Endpoint
-The python wrapper will automatically expose a `/metadata` endpoint to return metadata about the loaded model. It is up to the developer to implement a `metadata` method in their class to provide an arbitrary Dict back containing the model metadata.\
-
 ## REST Health Endpoint
 If you wish to add a REST health point, you can implement the `health_status` method with signature as shown below:
 ```python
@@ -427,6 +424,18 @@ class Model:
         # Make predictions using float_array
 ```
 
+
+## Incubating features
+
+
+### REST Metadata Endpoint
+The python wrapper will automatically expose a `/metadata` endpoint to return metadata about the loaded model.
+It is up to the developer to implement a `metadata` method in their class to provide an arbitrary `dict` back containing the model metadata.
+
+Note: future work will most likely standardize `/metadata` endpoint and change behaviour of this method. See [this](https://github.com/SeldonIO/seldon-core/issues/1638) GitHub issue for details.
+
+
+
 ## Next Steps
 
 After you have created the Component you need to create a Docker image that can be managed by Seldon Core. Follow the documentation to do this with [s2i](./python_wrapping_s2i.md) or [Docker](./python_wrapping_docker.md).