Detector alarm system

I just had a walk on a forest and had the car standing in a parking lot. I had no net there and when I came back I had the message that the vehicle alarm was triggered. Do you know exactly what triggers the alarm? Did someone touch the car or could it have been a false alarm? According to Tesla, when trying to open a locked door. Sentry was unfortunately out. A colleague with Model X thinks he constantly had false alarms and would already not be dana anymore. I don’t know.