class_docstr: Metrics Plugin for TensorBoard.
code: def _serve_tags(self, request):
      ctx = plugin_util.context(request.environ)
      experiment = plugin_util.experiment_id(request.environ)
      index = self._tags_impl(ctx, experiment=experiment)
      return http_util.Respond(request, index, "application/json")
  
imports: import collections
  import imghdr
  import json
  from werkzeug import wrappers
  from tensorboard import errors
  from tensorboard import plugin_util
  from tensorboard.backend import http_util
  from tensorboard.data import provider
  from tensorboard.plugins import base_plugin
  from tensorboard.plugins.histogram import metadata
  from tensorboard.plugins.image import metadata
  from tensorboard.plugins.metrics import metadata
  from tensorboard.plugins.scalar import metadata
label_desc: Use image node_id 6 for calling the MetricsPlugin obj's underlying member method code with example usage: obj._serve_tags(request) and returns: http_util