code: public PostExecutionInterceptorContext excludeCallTree(String reason) {
  		if (!mustPreserveCallTree) {
  			logger.debug("Excluding call tree because {}", reason);
  			excludeCallTree = true;
  		}
  		return this;
  	}
docs: Requests that the call tree should not be added to the current {@link Span}
  
  @param reason the reason why the call tree should be excluded (debug message)
  @return <code>this</code> for chaining