A great description of vLB scale-out use-case - including CDS integration is available in ONAP Read The Docs (El Alto release!) :
https://docs.onap.readthedocs.ioorg/projects/onap-integration/en/latest/submodules/integration.git/docs/docs_scaleout.htmlhtml#docs-scaleout
Includes:
- Design Time activities
- Run Time activities
- Closed Loop triggering scale-out actions