how to print the triggered symbol of the triggered event

I see we can add multiple trigger symbols to one strategy. When the event is triggered, the event is logged in the running log. I didn't find a way to print which symbol(in my case which stock) is this event triggered for. Anyone has any idea? Thanks.

I tried to define a global variable to a symbol and throught I can assign to the triggered symbol in the code after the condition is triggered but it doesn't have this option