UUID for alarm not alarm event

I have to send alarm events to a server via http, first when an alarm becomes active and then again when the alarm is cleared. The customer has requested a unique identifier is used to tie to the two events together.
I am using an alarm notification pipeline to trigger the data transaction for both Active and Clear states. It works nicely except that each event gets its own UUID, i.e. one UUID for the Active event and a different one for the Clear event, which doesn’t help identify which Clear goes with which Active. Is there a way to get an identifier that is unique to each alarm and common to all events on that alarm?