storage/tsdb/tsdb.go
func (s *ReadyStorage) StartTime() (int64, error) {
	if x := s.get(); x != nil {
		return x.StartTime()
	}
	return int64(model.Latest), ErrNotReady
}
func (s *ReadyStorage) StartTime() (int64, error) {
	if x := s.get(); x != nil {
		return x.StartTime()
	}
	return int64(model.Latest), ErrNotReady
}
// StartTime implements the Storage interface.