leave

suspend fun leave(group: String)

Stops taking part in group: heartbeats the record without it at once, or, for the last group, leaves the service and stops the heartbeats and the reads. The group leaves the record's list before the store is called, so no heartbeat lists it again, even one that waits on the store meanwhile; a leave of a group left already, one whose call was cancelled say, still brings the record and the heartbeats in line.