code: private void initLogThreshold(Long threshold) {
  		this.logThreshold = threshold;
  		final LogTemplate<Split> toLogger = toSLF4J(getClass().getName(), "debug");
  		if (threshold == null) {
  			callTreeLogTemplate = toLogger;
  		} else {
  			callTreeLogTemplate = whenSplitLongerThanMilliseconds(toLogger, threshold);
  		}
  	}
docs: Configures {@link #callTreeLogTemplate} with a {@link SplitThresholdLogTemplate}.