Capture fields

Match generation IDs to connect topics read in the same collection pass.

Field	Type	Unit	Meaning
sparklogs.capture.id	string		Collection group name identifying topics read together.
sparklogs.capture.generation_id	string		ID shared by topics read in one collection pass. Use it to correlate topics; matching timestamps alone are insufficient.
sparklogs.capture.store	string		memory when the agent could not open its state store and kept its state in memory for this run: the row is an observation only, never compared with what an earlier run saw. Absent otherwise.