The input to my logstash is is populating
[Current][Alarms] from the input
...\"Alarms\":null... when there are no alarms, and when there are alarms then it is a list.
When there are no alarms, I still want to see
"Alarms":  in the output.
When I try to force the empty array from a Ruby block like this
event.set('[Current][Alarms]', ) then it does not appear as a field in the output.
Is there a way to force the empty array or will those always get dropped?