code: def gather_data(registry):
      
  
      # Get the host name of the machine
      host = socket.gethostname()
  
      # Create our collectors
      io_metric = Summary("write_file_io_example",
                          "Writing io file in disk example.",
                          {'host': host})
  
      # register the metric collectors
      registry.register(io_metric)
      chunk = b'\xff'*4000  # 4000 bytes
      filename_path = "/tmp/prometheus_test"
      blocksizes = (100, 10000, 1000000, 100000000)
  
      # Start gathering metrics every 0.7 seconds
      while True:
          time.sleep(0.7)
  
          for i in blocksizes:
              time_start = time.time()
              # Action
              with open(filename_path, "wb") as f:
                  for _ in range(i // 10000):
                      f.write(chunk)
  
              io_metric.add({"file": filename_path, "block": i},
                            time.time() - time_start)
docs: Gathers the metrics