The host.json file in the function app allows for the configuration of the host runtime and trigger behaviors. In addition to batching behaviors, you can manage concurrency for a number of triggers. Often, adjusting the values in these options can help each instance scale appropriately for the demands of the invoked functions.
The settings in the hosts file apply across all functions within the app, within a single instance of the function. For example, if you had a function app with 2 HTTP functions and concurrent requests set to 25, a request to either HTTP trigger would count towards the shared 25 concurrent requests. If that function app scaled to 10 instances, the 2 functions would ...
