What is a “unit” and how can I scale my service?
Customers can scale API Management by adding and removing units. Each unit has capacity that depends on its tier. For example, the standard tier provides an estimated maximum throughput of approximately 2,500 requests per second. As you add additional units, capacity scales proportionately. For example, two units of standard provides approximately 5,000 requests per second.
Related questions and answers
No. There is no on-premises deployment option available at this time, but you can vote on uservoice if you would like this capability. However, you can certainly use Azure-based API management with on-premises systems and data.
The developer tier is for API Management trial, development and functional test. Customers should not use this tier for production.