Microsoft: Disk Space Usage
Often for customer demos I show this particular example or get questions as its pinned to my Azure Dashboard – its the first thing you see.
Performance counters are a great sources of performance data obviously, but also has some other data points such as % free space. You will need to check you have this counter in your OMS workspace, if not you can add it under Advanced Settings – Data – Windows Performace Counters
If you run, this query you will either get the data or find you need to add the counter:
Read the entire article here, Disk Space Usage – UK Hybrid Cloud Team
Via the fine folks at Microsoft