The Google Cloud products page [1] lists 17 main products. Two are in alpha (Container Engine, Deployment Manager), one is in beta (Pub/Sub). The rest are fully supported.

Wait a second. I just clicked though the items on that page, and the following are listed as alpha:

  Container Engine
  Cloud Dataflow
  Cloud Deployment Manager

The following are in Beta:

  HTTP/HTTPS Load Balancing
  Virtual Private Network
  Cloud Pub/Sub
  Cloud Monitoring
  Cloud Logging

If these aren't in beta/alpha, then maybe you should update your docs.