Merge pull request #2225 from hashicorp/f-stats-note

Adds a cautionary note about the stats in the self API.

website/source/docs/agent/http/agent.html.markdown

@@ -121,7 +121,9 @@ This endpoint is hit with a GET and returns a JSON body like:
 
 ### <a name="agent_self"></a> /v1/agent/self
 
-This endpoint is used to return the configuration and member information of the local agent.
+This endpoint is used to return the configuration and member information of the local agent under the `Config` key.
+
+Consul 0.7.0 and later also includes a snapshot of various operating statistics under the `Stats` key. These statistics are intended to help human operators for debugging and may change over time, so this part of the interface should not be consumed programatically.
 
 It returns a JSON body like this: