An Azure service that provides an event-driven serverless compute platform.
Azure collects this information and makes it available to you on most screens in the portal- where you open the log defines the initial filter. If you open up the function app in the portal and choose Activity Log, it should show you this information. There are additional configuration options if you want to adjust where this data is stored or automate log monitoring. You can read up more on that here: https://learn.microsoft.com/en-us/azure/azure-monitor/platform/activity-log#view-the-activity-log