The present invention provides a system, device, method, software program and data signal for monitoring an interaction. The device includes a trigger detection module arranged to monitor events on a hardware device to determine a trigger for an event. On determining the trigger for the event, the trigger detection module invokes a timer module arranged to monitor for completion of the event. Upon completion of the event, the timer module records the total time of the event in an event record.

Methods for event report management in a network comprising a set of NF nodes, and corresponding NF nodes. The A method is implemented at a first NF node for providing an event exposure service for a User Equipment, UE, to a second NF node which subscribes the event exposure service includes starting a report mute guard timer upon receiving a first presence status report for the UE from a third NF node. The method includes avoiding a transmission of an event report to the second NF node while the report mute timer is running and transmitting an event report corresponding to a latest presence status report received during the running of the report mute guard timer to the second NF node when the report mute guard timer expires. The present disclosure further provides corresponding NF nodes and computer readable medium.