code: func (c *convergence) orphanedActualLRPs(logger lager.Logger) {
  	logger = logger.Session("orphaned-actual-lrps")
  
  	rows, err := c.selectOrphanedActualLRPs(logger, c.db)
  	if err != nil {
  		logger.Error("failed-query", err)
  		return
  	}
  
  	c.keysToRetire = append(c.keysToRetire, scanActualLRPs(logger, rows)...)
  }
docs: // Adds orphaned Actual LRPs (ones with no corresponding Desired LRP) to the
  // list of keys to retire.