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. Delta rows only.
sparklogs.data.delta_old	object		The complete previous row, included on delta rows.
sparklogs.data.absent_since	string	timestamp	When a removed row was first seen 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.