code: def cli(env, ack_all):
      
  
      manager = AccountManager(env.client)
      events = manager.get_upcoming_events()
  
      if ack_all:
          for event in events:
              result = manager.ack_event(event['id'])
              event['acknowledgedFlag'] = result
      env.fout(event_table(events))
docs: Summary and acknowledgement of upcoming and ongoing maintenance events