Keep using tenant config collections after FCV downgrade

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    • Type: Task
    • Resolution: Won't Do
    • Priority: Major - P3
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      Once we start reading from tenant config collections, and stop writing to global config collections, we must continue using tenant config collections even if FCV is downgraded. Perhaps mongod's rule is "if ShardMergeFCVTimestamp is more than 30 minutes ago, read from tenant config collections, even if FCV < ShardMergeFCV". See design doc for details.

              Assignee:
              [DO NOT USE] Backlog - Server Serverless (Inactive)
              Reporter:
              A. Jesse Jiryu Davis
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