Related issue: #2735
Motivation:
When an application is under load and experiencing a lot of failure, the
instantiation of DefaultExceptionEvent spends noticeable amount of time
because of StackTraceSimplifier.
Also, StackTraceSimplifier makes people sometimes confused because it
hides the execution path partially.
Modifications:
Remove the use of StackTraceSimplifier
Result:
JVM spends much less time at Throwable.getStackTrace()
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