A: When users exceed their limits, administrators can see this in the admin center (see below).
You can do either one of the following:
Adjust the app or flow to use fewer API requests
Purchase the Power Apps and Power Automate capacity add-on for your organization C: Home (default) Dashboard.
This is the default dashboard that provides information on the number of active Dataverse users, storage usage, the most active workflows, and more.

API Calls: API Calls Number of API calls that were made by the Dataverse environment for the selected time period.
Reference:
https://docs.microsoft.com/en-us/power-platform/admin/api-request-limits-allocations
https://docs.microsoft.com/en-us/power-platform/admin/analytics-common-data-service