replicating property
Whether the engine reports this member's replication stream as up. Null when no reading was taken: a primary has no stream to report, and a member that is not active, or whose probe did not answer, has none yet. False is a reading and null is the absence of one, so the two are not interchangeable. Read it beside lagSeconds before expecting a failover that names no target to find a promotable standby: a member streaming at a known lag is one, and a member reporting null is not evidence either way.
Implementation
final bool? replicating;