GelfAppender.GelfAppender.doFilter method of the Filter is called by the
container each time a request/response pair is passed through the
chain due to a client request for a resource at the end of the chain.GelfAppender to the root logger.Filter which logs requests and adds some data about it to the logger's MDC.Thread.UncaughtExceptionHandler which logs the last uncaught exception with a SLF4J
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