To expand on what Kristian posted try running this search
index=_internal sourcetype=splunkd "current data throughput" | rex "Current data throughput \((?<kb>\S+)" | eval rate=case(kb < 500, "256", kb > 499 AND kb < 520, "512", kb > 520 AND kb < 770 ,"768", kb>771 AND kb<1210, "1024", 1=1, ">1024") | stats count as Count sparkline as Trend by host, rate | where Count > 4 | rename rate as "Throughput rate(kb)" | sort -"Throughput rate(kb)",-Count
It is one I baked into the app Forwarder Health
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