protected Map<String, String> coreReportMessage() {
    final Map<String, String> result = super.coreReportMessage();
    result.put("totalTablets", String.valueOf(totalTablets));
    result.put("nextOffset", String.valueOf(nextOffset));
    result.put("totalBufferSize", String.valueOf(totalBufferSize));
    result.put("availableForNext", String.valueOf(availableForNext));
    return result;
  }
The {@code SubscriptionEventTabletResponse} class extends {@link
SubscriptionEventExtendableResponse} to handle subscription responses specifically for tablet
data. The actual payload of the response includes a {@link TabletsPayload}, which contains the
tablet information being processed.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/subscription/event/response/SubscriptionEventTabletResponse.java