Re: CF 231 Diego?
We are not sure which docs you are referring to - can you clarify this?
Cloud Foundry is available as a bosh release at https://github.com/cloudfoundry/cf-release - this includes the 'dea' backend which is older than the 'diego' backend and has always been a part of this release. Diego is available as a separate bosh release at https://github.com/cloudfoundry-incubator/diego-release. Both cf-release and diego-release are open source.
Instead of continually adding more components to cf-release, we are moving towards separate bosh releases for each component - diego was the first release to adopt this pattern.
To add diego to your existing Cloud Foundry bosh deployment, you will need to create a separate bosh deployment of diego, and point it at your existing Cloud Foundry deployment. The instructions at the diego-release should provide a good starting point.
Looking forwards, we are creating tooling to provide a better experience in composing these separate releases into a single unified bosh deployment.
Rob & Nima
CF Release Integration