Adding a New Instrument to an Existing Trace Document
Expand on the amount and type of data collected by adding a new instrument to your trace document.
Click Library to open the Library pane.
Select the Library directory.
Drag the desired instrument to the Instruments pane.
You can place multiple instances of an instrument in your trace document with each one set up to collect data from a different process or application. In this way, you can track how a client and server interact with each other.
The video shows the Core Data Cache Misses instrument being added to a trace document.