code: @Test public void endOfLivedAppenderShouldBeAvailableDuringLingeringPeriod(){
    Appender a=appenderTracker.getOrCreate(key,now);
    appenderTracker.endOfLife(key);
    appenderTracker.removeStaleComponents(now);
    Appender lingering=appenderTracker.getOrCreate(key,now);
    assertTrue(lingering.isStarted());
    assertTrue(a == lingering);
    now+=AppenderTracker.LINGERING_TIMEOUT + 1;
    appenderTracker.removeStaleComponents(now);
    assertFalse(a.isStarted());
    a=appenderTracker.find(key);
    assertNull(a);
  }
  