Number of potentially lost/delayed heartbeats that will be accepted before considering it to be an anomaly. The ClusterReceptionist is using the akka.remote.DeadlineFailureDetector, which will trigger if there are no heartbeats within the duration heartbeat-interval + acceptable-heartbeat-pause, i.e. 15 seconds with the default settings.

public TimeSpan AcceptableHeartbeatPause { get; }

member AcceptableHeartbeatPause : TimeSpan with get