code: def _serve_tags(self, request):
      ctx = plugin_util.context(request.environ)
      experiment = plugin_util.experiment_id(request.environ)
  
      mapping = self.data_provider.list_tensors(
          ctx,
          experiment_id=experiment,
          plugin_name=metadata.PLUGIN_NAME,
      )
  
      result = {run: {} for run in mapping}
      for run, tag_to_timeseries in mapping.items():
          for tag, timeseries in tag_to_timeseries.items():
              result[run][tag] = {
                  "description": timeseries.description,
              }
      contents = json.dumps(result, sort_keys=True)
      return werkzeug.Response(
          contents, content_type="application/json"
      )
  
file_path: tensorboard/tensorboard/examples/plugins/example_basic/tensorboard_plugin_example/plugin.py
imports: import json
  import os
  from tensorboard import plugin_util
  from tensorboard.data import provider
  from tensorboard.plugins import base_plugin
  import werkzeug
  from werkzeug import wrappers
  from tensorboard_plugin_example import metadata
label_desc: Use image node_id 6 for calling the ExamplePlugin obj's underlying member method code with example usage: obj._serve_tags(request) and returns: werkzeug