How does Auto-inflate feature of Event Hubs work?
The auto-inflate feature lets you scale up your throughput units (TUs). It means that you can start by purchasing low TUs and auto-inflate scales up your TUs as your ingress increases. It gives you a cost-effective option and complete control of the number of TUs to manage. This feature is a scale-up only feature, and you can completely control the scaling down of the number of TUs by updating it.
You may want to start with low throughput units (TUs), for example, 2 TUs. If you predict that your traffic may grow to 15 TUs, turn-on the auto-inflate feature on your namespace, and set the max limit to 15 TUs. You can now grow your TUs automatically as your traffic grows.