To ensure that customised reporting is consistent with output from Fatigue Manager, it's important to understand how configured alarm clustering affects the count of events.
Each alarm is considered part of a cluster, meaning that isolated alarms are in a cluster of one. Any alarm occurring within a specified time (Cluster Duration) of another instance of the same alarm is considered a member of the same cluster. For clarity, if the cluster duration is set to 10 minutes, and five (5) alarms occur 8 minutes apart over a period of 32 minutes, all five alarms form one alarm cluster.
The logic behind this approach relates to identifying this as one "event", which is why it may not be advisable to set the Cluster Duration above 60 mins.