docs: def set_storage_container_metadata(kwargs=None, storage_conn=None, call=None):
      '''
      .. versionadded:: 2015.8.0
  
      Set a storage container's metadata
  
      CLI Example:
  
      .. code-block:: bash
  
          salt-cloud -f set_storage_container my-azure name=mycontainer \\
              x_ms_meta_name_values='{"my_name": "my_value"}'
  
      name:
          Name of existing container.
      meta_name_values:
          A dict containing name, value for metadata.
          Example: {'category':'test'}
      lease_id:
          If specified, set_storage_container_metadata only succeeds if the
          container's lease is active and matches this ID.
      '''
      if call != 'function':
          raise SaltCloudSystemExit(
              'The create_storage_container function must be called with -f or --function.'
          )
  
      if kwargs is None:
          kwargs = {}
  
      if 'name' not in kwargs:
          raise SaltCloudSystemExit('An storage container name must be specified as "name"')
  
      x_ms_meta_name_values = salt.utils.yaml.safe_load(
          kwargs.get('meta_name_values', '')
      )
  
      if not storage_conn:
          storage_conn = get_storage_conn(conn_kwargs=kwargs)
  
      try:
          storage_conn.set_container_metadata(
              container_name=kwargs['name'],
              x_ms_meta_name_values=x_ms_meta_name_values,
              x_ms_lease_id=kwargs.get('lease_id', None),
          )
          return {'Success': 'The storage container was successfully updated'}
      except AzureConflictHttpError:
          raise SaltCloudSystemExit('There was a conflict.')