Can you load metrics.log into vi and search there?
I just ssh'd into one of our forwarders and it worked for me...
$ grep -i "name=thruput" metrics.log
01-26-2017 15:16:23.841 -0600 INFO Metrics - group=thruput, name=thruput, instantaneous_kbps=0.202834, instantaneous_eps=0.257975, average_kbps=19.430535, total_k_processed=4248380.000000, kb=6.290039, ev=8.000000, load_average=2.010000
01-26-2017 15:16:54.829 -0600 INFO Metrics - group=thruput, name=thruput, instantaneous_kbps=0.219149, instantaneous_eps=0.613138, average_kbps=19.427809, total_k_processed=4248386.000000, kb=6.791016, ev=19.000000, load_average=1.610000
01-26-2017 15:17:25.829 -0600 INFO Metrics - group=thruput, name=thruput, instantaneous_kbps=0.209961, instantaneous_eps=0.258064, average_kbps=19.425083, total_k_processed=4248392.000000, kb=6.508789, ev=8.000000, load_average=1.500000
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