code: def on_step_end(self, iteration, trials, **kwargs):
      if time.time() - self.last_update > self.update_interval:
          now = time.time()
          result = {
              "last_update": now,
              "iteration": iteration,
              "trial_states": dict(
                  Counter([trial.status for trial in trials])
              ),
          }
  
          path = "/tmp/release_test_out.json"
          test_output_json_tmp = path + ".tmp"
          with open(test_output_json_tmp, "wt") as f:
              json.dump(result, f)
          os.replace(test_output_json_tmp, path)
          print(f"Wrote results to {test_output_json_tmp}")
          print(json.dumps(result))
  
          self.last_update = now
  
file_path: ray/release/tune_tests/cloud_tests/workloads/long_running_cloud_storage.py
imports: import json
  import os
  import pickle
  import tempfile
  import time
  from collections import Counter
  import click
  import numpy
  from ray import train, tune
  from ray.train import Checkpoint, CheckpointConfig, RunConfig
  from ray.tune import Callback
label_desc: Use image node_id 2 for calling the ProgressCallback obj's underlying member method code with example usage: obj.on_step_end(iteration, trials) without return types