Splunk search for Details of hosts with UF sending data
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index=_internal sourcetype=splunkd group=tcpin_connections NOT eventType=* | eval Host=if(isnull(hostname), sourceHost,hostname) | eval version=if(isnull(version),"< 4.2",version) | eval architecture=if(isnull(arch),"unknown",arch) | stats count by Host version architecture | sort version
This Splunk search will provided detailed information on any forwarders that are sending data to the Indexing tier.