docker0 network interface suddenly appeared in the system?
# ip a
3: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN
link/ether 2001:db8:f61:a1ff:0:0:0:80 brd ff:ff:ff:ff:ff:ff
inet 203.0.113.2/16 scope global docker0
valid_lft forever preferred_lft forever
Docker component has been installed.
docker0 interface is the bridge device for Docker. All traffic from the Docker containers flows over it to the Docker daemon, which handles routing on behalf of the container.
If it is required to delete this interface from the system, it can be done by deleting the Docker component from Plesk using Plesk Installer.