private int readTimeDelta() throws IOException {
      int result = dataIn.readUnsignedShort();
      if (result == INT_TIMESTAMP_TOKEN) {
        result = dataIn.readInt();
      }
      return result;
    }
Returns global information about the read archive. Returns null if no information is
available.
geode-core/src/main/java/org/apache/geode/internal/statistics/StatArchiveReader.java