We are now part of a brand new GitHub organization: VMware Tanzu. VMware Tanzu is a new family of projects, products and services for the cloud native world. The Sonobuoy project is a critical part to conformance tests on Kubernetes, so it makes sense that it would be moved to sit alongside all the other VMware-supported cloud native repositories. You can read more about this change in this VMware blog post.
As always, we welcome feedback and participation in the development of Sonobuoy. All information on how to contact us or become involved can be found on our community page.