code: def spring_metrics(parser, token):
      
      bits = token.split_contents()
      if len(bits) > 1:
          raise TemplateSyntaxError("'%s' takes no arguments" % bits[0])
      return SpringMetricsNode()
docs: Spring Metrics tracking template tag.
  
      Renders Javascript code to track page visits.  You must supply
      your Spring Metrics Tracking ID in the
      ``SPRING_METRICS_TRACKING_ID`` setting.