There’s nothing to worry about. 
Just make sure you enable legacy bindings and you can still use the mqtt1 binding without having to immediately migrate to the new binding. See also: MQTT Binding 2.4 - what changed? not working anymore - #8 by job
There’s nothing to worry about. Just make sure you enable legacy bindings and you can still use the mqtt1 binding without having to immediately migrate to the new binding. See also: MQTT Binding 2.4 - what changed? not working anymore - #8 by job