Storing instances of a metric

This is probably a total newbie question :expressionless:
I am designing a schema to store the data collected from Windows machines. I would like to store the time, device_id, metric_type (i.e. CPU), the instance of that metric (i.e. core6) and the value. I assume that.
How can I do that? When I will display the data in a UI, I would like to show the instance of the metric (i.e. core#6 had a load of 45%)
Another example is with Disks: I am collecting a metric called percent_full, but it can be for volume c:, d:, and v: - I donโ€™t know what will be the instances ahead of time