code: def emit_toi_stats(toi_set, peripherals):
      
  
      count_by_zoom = defaultdict(int)
      total = 0
      for coord_int in toi_set:
          coord = coord_unmarshall_int(coord_int)
          count_by_zoom[coord.zoom] += 1
          total += 1
  
      peripherals.stats.gauge('tiles-of-interest.count', total)
      for zoom, count in count_by_zoom.items():
          peripherals.stats.gauge(
              'tiles-of-interest.by-zoom.z{:02d}'.format(zoom),
              count
          )
docs: Calculates new TOI stats and emits them via statsd.