code: func (t *DatacentersTable) ids(c context.Context) map[string]int64 {
  	dcs := make(map[string]int64, len(t.current))
  	for _, dc := range t.current {
  		dcs[dc.Name] = dc.Id
  	}
  	return dcs
  }
docs: // ids returns a map of datacenter names to IDs.