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I think it’s meant to be monotonic within one node but not cross-node (cross-node the sort order is random within the same millisecond). The random portion of the IDs are sequentially incrementing within a single MS on a given node.

I think it means all ids from the same node will be monotonic, ie it will never generate a id that will be sorted before an earlier one

Afaik it depends on the generate function you use. You can let it keep track of the increment when generating, at a performance cost (atomic operations).