Hi Veena Anand,
Based on my research, the log size limit can be set by the "max userdump limit"
and "Full Userdump and Mini Userdump",
The DebugDiag UI keeps a count of the number of userdumps generated. In the default crash rule that was added in the earlier scenario, there is a limit of 10 userdumps that the rule could create. DebugDiag imposes this limit so that the hard disk drive does
not run out of space.
For more detailed information, please refer to this article:
How to Use the Debug Diagnostic Tool v1.1 (DebugDiag) to Debug User Mode Processes
I hope this helps.