How to connect APi for Kibana dashboard/vishualisation

I have metricbeat data's in my dashboard,My dev Team has an API to sent a SMS,
1- If my system load goes above the 50% 0r 70% , My APi should sent the sms alert to me..
How to get the data from the metricbeat to connect with my API.
for example (System.Load.5)

Anyone?