You can find the source of this version on GitHub at cloudfoundry/diego-release. It was created based on the commit
You can reference this release in your deployment manifest from the
- name: "diego" version: "1.28.0" url: "https://bosh.io/d/github.com/cloudfoundry/diego-release?v=1.28.0" sha1: "f78e142e051ca8fd7a186dc321931531ab879a1c"
Or upload it to your director with the
bosh upload-release --sha1 f78e142e051ca8fd7a186dc321931531ab879a1c \ https://bosh.io/d/github.com/cloudfoundry/diego-release?v=1.28.0