code: def load_sub_plugins_from_str(cls, plugins_str):
          
          plugin_classes = {}
          if plugins_str:
              for plugin_name in plugins_str.split(":"):
                  pc = load_plugin(plugin_name, MONITOR_DEFAULT_PLUGIN_MODULE)
                  plugin_classes[plugin_name] = pc
          return plugin_classes
docs: Load plugin classes based on column separated list of plugin names.
  
          Returns dict with plugin name as key and class as value.