code: func (l *DiagnosticLog) Seek(ctx context.Context, nlines int32) error {
  	h, err := l.m.BrowseLog(ctx, l.Host, l.Key, math.MaxInt32, 0)
  	if err != nil {
  		return err
  	}
  
  	l.Start = h.LineEnd - nlines
  
  	return nil
  }
docs: // Seek to log position starting at the last nlines of the log