Support Sharding across namespaces

[ramonsmits]

Describe the feature.

While scaling up Compute (Messaging Units) allocated to the namespace is an easier solution, it might not provide a linear increase in the throughput. It's because of Service Bus internals (storage, network, etc.), which might be limiting the throughput.

The cleaner solution in this case is to shard your entities (queues, and topics) across different Service Bus Premium namespaces. You can also consider sharding across different namespaces in different Azure regions.

Source: https://learn.microsoft.com/en-us/azure/service-bus-messaging/service-bus-performance-improvements?tabs=net-standard-sdk-2#sharding-across-namespaces

Additional Context

No response