Renaming a ceph node

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Can anyone please point me at a doc that explains the most efficient procedure to rename a ceph node WITHOUT causing a massive misplaced objects churn?

When my node came up with a new name, it properly joined the cluster and owned the OSDs, but the original node with no devices remained.  I expect this affected the crush map such that a large qty of objects got reshuffled.  I want no object movement, if possible.

BTW this old cluster is on luminous. ☹

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