Ability to use existing ddos for hub vnet Feature Request

[Karmeshs]

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Description

Is your feature request related to a problem?

I would reaaly like to have the option to use an existing ddos service for the hub Vnet instead of the present options which either disables it or creates a new one if enabled. DDoS is an expensive service & we have already created one post deployment of the LZ (using another terraform script) which we are using across all our spokes too.

When I run the terraform script for the LZ now, it is creating a new ddos & replacing it with our existing one on the hub vnet. If I disable the ddos in network settings option then it disassociates the existing ddos from the hub.

Describe the solution you'd like

I would like to have the option to add/use an existing ddos for the hub using the existing ddos id.

Additional context