Geo Recovery DR Aliases are a tool that create a failover group between Primary and Secondary EH Namespaces.

Also, diagnostic settings can be applied to resources and can be streamed to Event Hubs as an endpoint. However, it is not possible currently to send logs to an Event Hub GeoDR Alias, that would end up in Primary Namespace, and would switch to Secondary namespace if the first is offline. Similar behavior of that of a SQL Failover Group.

This feature would be ideal and would solve the issue of resources not being able to write to an Event Hub in a different region, as they can send to the DR Alias, that is a global resource.