Services that are not zone redundant in Azure Eventhub Namespace tend to have a single points of failure.
In Azure Console -
In Terraform -
References:
https://learn.microsoft.com/en-us/azure/event-hubs/event-hubs-geo-dr?tabs=portal
https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/eventhub_namespace#zone_redundant