What is the definition of "Load " in the context of the Host Metrics page in Ambari? And how is it calculated?
Ambari Metrics Service uses psutil library to collect host metrics. The metrics's explanation can be found here - https://pythonhosted.org/psutil/.
The Load graph contains the metrics for 1-minute / 5minute and 15minute Load average on the host.
For more information, from the psutil docs,