State row fields

Row identity and changes since the preceding observation.

Field	Type	Unit	Meaning
sparklogs.data.instance	string		The subject ID of this inventory or change row.
sparklogs.data.delta_kind	string		What happened to this row: added, changed or removed. On delta rows; on an inventory row added or changed since the topic last reported its changes, which a delta would otherwise have carried (an inventory lists no removed row); on the row of a monitor whose transition came with a change to that row; and on monitor rows for a departed subject whose current row is unavailable. Absent on an unchanged inventory row.
sparklogs.data.delta_fields	string_array		On a changed delta, inventory or monitor row: the State fields whose comparison moved, sorted, by each field's compare key where it declares one. Empty when the row rides the delta for a crossing or a sweep, or a held window's net change is nothing. Absent on added and removed rows.
sparklogs.data.delta_old	object		The complete previous row, included on delta rows and monitor rows for a departed subject whose current row is unavailable.
sparklogs.data.absent_since	string	timestamp	When a removed row was first found missing, stamped by the agent on the removal rather than read from the row. Only on the removal that ends a missing row's grace, on topics that grant grace; the row stayed listed until then.