In program debugging, a stack trace is a report of the computer's internal processing operations. It generally identifies the last routine called in the program before it crashed. See stack and stack pointer.
While often not exploitable in and of itself, the leak, such as an error message, default error page, stack trace or directory listing info leak, is something an attacker can use to formulate and refine their attack strategy.
Collect CPU and wall-clock statistics at the class constructor and method level for the classes selected, with detailed information on the stack trace signatures and threads involved with each constructor or method;