为什么log4j会在（很多）重复相同的异常之后禁用堆栈跟踪？

At one of our customer installations we had thousands of occurrences of the same exception. After a lot of well logged stacktraces (9332) the occurrence of the exception is still logged, but without stacktrace. After restarting the java process, the same thing: This time we had 17858 stacktraces and then only the exception occurrence itself.At one of our customer installations we had tho