Refer to the official documentation below to configure log forwarding from Fortinet FortiGate.
The Scope application supports ingestion of Fortinet FortiGate logs in the Syslog format.
<188>date=2020-04-23 time=12:17:48 devname="testswitch1" devid="somerouterid" logid="0316013056" type="utm" subtype="webfilter" eventtype="ftgd_blk" level="warning" vd="root" eventtime=1587230269052907555 tz="-0500" policyid=100602 sessionid=1234 user="elasticuser" group="elasticgroup" authserver="elasticauth" srcip=192.168.2.1 srcport=61930 srcintf="port1" srcintfrole="lan" dstip=67.43.156.13 dstport=443 dstintf="wan1" dstintfrole="wan" proto=6 service="HTTPS" hostname="elastic.co" profile="elasticruleset" action="blocked" reqtype="direct" url="/config/" sentbyte=1152 rcvdbyte=1130 direction="outgoing" msg="URL belongs to a denied category in policy" method="domain" cat=76 catdesc="Internet Telephony"