code: def is_active(self):
      
      if not self._multiplexer:
        return False
  
      scalars_plugin_instance = self._get_scalars_plugin()
      if not (scalars_plugin_instance and
              scalars_plugin_instance.is_active()):
        return False
  
      # This plugin is active if any run has a layout.
      return bool(self._multiplexer.PluginRunToTagToContent(metadata.PLUGIN_NAME))
docs: This plugin is active if 2 conditions hold.
  
      1. The scalars plugin is registered and active.
      2. There is a custom layout for the dashboard.
  
      Returns: A boolean. Whether the plugin is active.