<4>Jul 13 17:34:50 hq-ui001 kernel: [1205361.476459] [UFW BLOCK] IN=ens5 OUT= MAC=02:de:5d:9b:04:6e:02:4b:94:bf:cd:44:08:00 SRC=66.187.179.169 DST=126.67.110.165 LEN=52 TOS=0x00 PREC=0x00 TTL=255 ID=60673 DF PROTO=TCP SPT=35786 DPT=80 WINDOW=1120 RES=0x00 ACK FIN URGP=0 
This is a syslog message from a product called Uncomplicated Firewall (UFW) by linux. The following fields were extracted from the message:
action: block
clientport: 35786
facilitylabel: kernel
localhostname: hq-ui001
localstarttime: Jul 13 17:34:50
messagetype: firewall_action
priority: 4
program: kernel
protocol: 6
senderhost: 10.1.100.237
sensitivity: normal
serverbytes: 52
serverport: 80
severitycode: 4
severitylabel: warning
sourceinfo: unknown
tags: ['rfc3164', 'ufw', 'firewall_action']
streamName: ufw
clientIP: 66.187.179.169
serverIP: 126.67.110.165