<4>Jun 16 20:12:35 hq-ie001 kernel: [700071.150708] [UFW BLOCK] IN=ens5 OUT= MAC=02:89:99:e9:b6:8c:02:87:42:3e:4f:ba:08:00 SRC=76.106.171.98 DST=81.7.73.243 LEN=17950 TOS=0x00 PREC=0x00 TTL=64 ID=59074 DF PROTO=TCP SPT=9042 DPT=49134 WINDOW=442 RES=0x00 ACK 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
clientbytes: 17950
clientport: 49134
facilitylabel: kernel
localhostname: hq-ie001
localstarttime: Jun 16 20:12:35
messagetype: firewall_action
priority: 4
program: kernel
protocol: 6
senderhost: 10.1.100.159
sensitivity: normal
serverport: 9042
severitycode: 4
severitylabel: warning
sourceinfo: unknown
tags: ['rfc3164', 'ufw', 'firewall_action']
streamName: ufw
clientIP: 81.7.73.243
serverIP: 76.106.171.98