Firestore costs are based on document operations and on size of stored data. In the Firebase console, we can easily track number of document operations but I don't find any place where I can track size of stored data.
I have only found in Google Cloud Console (in App Engine > Quotas) a metric corresponding to the amount of stored data in gigabyte stored the current day, but not the total amount of stored data.
Is there a means of monitoring total size of stored data (ideally with indexes included) ?