SNMP Trap message Parameters for Edit

SNMP Trap message Parameters for Edit

I need to know all the parameters for editing the SNMP Trap Massage that Op-manger receive it from devices

For Example : 
I had edited the LinkDownV2c Trap message as this Picture :


and i got this result: 


I need the other parameter,
 like the parameter that give me the interface description 

And Thank you,
Best Regards,
Alaa

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