Custom counters are Windows Operating System or SQL Server metrics that are not monitored, by default, by SQL Diagnostic Manager. You can import already created custom counters from the through the Custom Counter Import Wizard. Once added to the SQL Diagnostic Manager interface, you can monitor the results, view historical trending of the metric, configure alerts and receive notifications on them, and generate reports based on collected data.
To import a custom counter:
On the Welcome to the Custom Counter Import page, click Next.
You can also access the Custom Counter import wizard by clicking > Import/Export from the navigation pane and selecting Custom Counter in the import column.
For instructions on exporting a custom counter, see Export a custom counter.