Make continuity an architectural capability.
Can the business explain, operate, and recover its infrastructure without relying on one key person or provider?
That dependency is the risk: operating knowledge lives in heads and vendor relationships the business does not own. Model the environment so the knowledge becomes institutional — explainable, changeable, and recoverable by the organization itself.
Knowledge that lives in people decays with every retirement, reorg, departure, and acquisition. Turn it into one operating model the business owns, so continuity stops depending on who stays.