code: def retrieve_instance_links(self):
          
          instance_links = {}
          self.log.debug("LINKS IS %s", LINKS)
          for key, value in LINKS.items():
              if value not in self.pipeline_config['instance_links'].values():
                  instance_links[key] = value
          return instance_links
docs: Appends on existing instance links
  
          Returns:
              instance_links: A dictionary containing all the instance links in LINKS and not in pipeline_config