code: func (db *DB) Get(key []byte) (value []byte, err error) {
  	value, err = db.ldb.Get(key, nil)
  	if err != nil {
  		if err == leveldb.ErrNotFound {
  			metrics.GetOrRegisterCounter("DB.getNotFound", nil).Inc(1)
  		} else {
  			metrics.GetOrRegisterCounter("DB.getFail", nil).Inc(1)
  		}
  		return nil, err
  	}
  	metrics.GetOrRegisterCounter("DB.get", nil).Inc(1)
  	return value, nil
  }
docs: // Get wraps LevelDB Get method to increment metrics counter.