class_docstr: Something that happened to the pipeline and was indicated to the listeners
      
code: def __init__(
      self,
      is_pipeline_modification=False,
      is_image_set_modification=False,
  ):
      self.is_pipeline_modification = is_pipeline_modification
      self.is_image_set_modification = is_image_set_modification
  
label_desc: Use image node_id 1 to create a new Event object  with example: obj = Event(is_pipeline_modification, is_image_set_modification)