class_docstr: A class used for accessing tfdbg v2 DebugEvent data on local filesystem.
  
  This class is a short-term hack, mirroring the EventMultiplexer for the main
  TensorBoard plugins (e.g., scalar, histogram and graphs.) As such, it only
  implements the methods relevant to the Debugger V2 pluggin.
  
  TODO(cais): Integrate it with EventMultiplexer and use the integrated class
  from MultiplexerDataProvider for a single path of accessing debugger and
  non-debugger data.
code: def PluginRunToTagToContent(self, plugin_name):
      raise NotImplementedError(
          "DebugDataMultiplexer.PluginRunToTagToContent() has not been "
          "implemented yet."
      )
  
imports: import threading
  from tensorboard import errors
label_desc: Use image node_id 5 for calling the DebuggerV2EventMultiplexer obj's underlying member method code with example usage: obj.PluginRunToTagToContent(plugin_name) without return types