Invalid metric used

[tbak]

In DefaultChannelWriter:

.doOnError(new Action1<Throwable>() {
                                   @Override
                                   public void call(Throwable throwable) {
                                       eventsSubject.onEvent(metricEventProvider.getFlushSuccessEvent(),
                                                             Clock.onEndMillis(startTimeMillis), throwable);
                                   }
                               });

should be metricEventProvider.getFlushFailedEvent.