The execution of the moveCollection and unshardCollection user-commands is backed by the ReshardingCoordinator, who triggers the emission of a reshardCollection op entry from the primary shard of the targeted namespace when a request is committed.

Different consumers of such an op entry may be interested in accepting/discarding it depending on the type of user request that originated it: in order to support this, the content of the op entry should include information about its provenance.