docs: @Override
      public DataPoint get(long timestampMs) {
          long _key = toTimeSeriesPoint(timestampMs);
          Map<Long, DataPoint> row = _getRowWithCache(timestampMs);
          DataPoint result = row != null ? row.get(_key) : null;
          return result != null ? result : new DataPoint(Type.NONE, _key, 0, RESOLUTION_MS);
      }