Change

Upgrade has been done from version 6.0.26 to version 7.0.5, after doing that some Autoregistration actions are triggered randomly for always the same hosts, there hosts already were there in zabbix.

We started to be aware of that because as part of the autoregistration actions one of the operations is send a notification email.

After doing some troubleshooting we are seeing that what is doing is adding a dns interface as default to the affected hosts (by default we use ip address as default interface)

Infra:
Two servers in HA 7.0.5, MySQL DB

Proxies in 4 different AWS regions in 7.0.5 MySQL DB 

Everything deployed in RedHat 8 OS

Hosts agents are using C version 6.0.x