How to make an alert traffic more 50 %

Please help me solve the task.
Input data:
Data source - elastic search
OID - ifHCOutOctets 1.3.6.1.2.1.31.1.1.1.10
I am nedd colculetion and compare the value .
Description:
A = Previous value (traffic value)
B = Сurrent value (traffic value)
Alert = Сurrent B > Previous A on 50%