fix: Pattern Layout throwable use Throwable.toString()#4033

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JongminChung wants to merge 3 commits intoapache:2.xfrom

JongminChung:fix/#4019

Commits on Jan 23, 2026

test: add unit test for throwable pattern with custom exception handling
JongminChung
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Revert "test: add unit test for throwable pattern with custom exception handling"
JongminChung
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fix: use Throwable.toString() for stacktrace
JongminChung
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