This ticket introduces an oplog schema change (makes the sz field under SingleOpSizeMetadata an optional field). Moving forward, the m top-level oplog field, which holds SingleOpSizeMetadata, will become a more general metadata field rather than one related only to the size & count project. The sz field was made optional because when future metadata fields are added to SingleOpSizeMetadata, entries will be able to legitimately contain these other fields but not the sz field.

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