ui2 overview doesn't display GPU usage info when using Fairscheduler

When using fair scheduler, GPU related information isn't displayed because the "metrics" api doesn't return any GPU related usage information( has run yarn on GPU per [this |https://hadoop.apache.org/docs/r3.1.1/hadoop-yarn/hadoop-yarn-site/UsingGpus.html).]  The hadoop version is 3.1.1