How to monitor the Azure app service host's file storage?

Since we don’t have a direct metric to monitor the file storage of an app service’s host, are there any alternative ways to monitor the file storage of the host of an app service. The one way to do this is using log analytics. If so, what’s the query to get the file storage of an app service’s host? The other option to monitor the file storage is by changing the JSON file of a Grafana panel. If so, what modifications do we have to make to the JSON file?