This section explains the metric measurement for the SQL Server plugin.
The plugin class that obtains most metrics is MsSQLMeasurementPlugin, which extends the Win32MeasurementPlugin support class.
The plugin uses an SQL script to obtain the "Free Space Percentage" metric. (The script is included in the plugin XML descriptor.) Other metric values are obtained from Windows Performance Manager counters. For more information about the metrics reported, see Cross reference SQL Server Metrics.