Zabbix 3.2 in a Ubuntu Xenial environment.

I started noticing the following messages generated by UFW on LXD "hypervisors". They show up only on hosts at the same site as our Zabbix instance:

Code:
[10283266.317242] [UFW BLOCK] IN=br1 OUT= MAC=0c:c4:7a:c2:f3:d6:00:16:3e:94:a2:4c:08:00
...