YARN + how to measure the consuming of number of core in yarn

[#1]

we have HDP cluster version - 2.6.5 with Ambari platform

here is example from our Ambari lab cluster with 5 mode managers machines

regarding to YARN service - is it possible to add in Ambari the widget that can show CPU core
consuming ?

if not what are the other ways to find the CORE consuming by YARN from cli ?

other way that we found is from the `resource_manager:8088/cluster`

as the following

so is it possible to find some API / CLI that can capture the VCores Used ?