Do we need to cover test scenarios for multiple controller instances

[Ziabatcha]

In the specification, we have API to add multiple controllers instance. As per our current architecture we have only one controller instance.

For testing, if tester add two controller into notification proxy. How the notification are consolidated or published to MWDI ?

[openBackhaul]

Unfortunately, the situation at the interface to the controller layer is very unclear, as is the further development.
It seems clear that only one ODL instance is currently in regular operation.
It is unclear whether, for example, two instances are temporarily in operation during an ODL update to avoid service interruptions.
In any case, the aim should be that after a redesign, the entire controller layer looks like exactly one controller to the outside world.