Provide a handover document for Jenkins (old pipelines) docs with pointers to resources, schedule and deliverables, including the scope of what the previous owners used to deliver.

Link to the doc from the onboarding doc.
Add a section for sign offs from previous doc owners.

Model it after DevTools Docs + RHEL Docs Content Strategy + Collaboration Plan:
https://docs.google.com/document/d/1O3Bwi1SBo2Cgj8faETIGu8FHI4teUlNhRUPWAHzY2PE/edit#
and .NET Core Transition to DevTools:
https://docs.google.com/document/d/1xmiml9v1jClogViNQMKTBy7xjjHmMOSVN0snRBnS-es/edit#