javabrett/perf4j — comment on commit f7a72732b33d845f27c0664f435f068cfa7d34bd
File: src/main/java/org/perf4j/log4j/AsyncCoalescingStatisticsAppender.java line 46
By javabrett:

Promoted shutdown thread from anonymous class to inner/static. This makes it easy to safely de-reference all appenders in case we can't remove the hook for whatever reason.