@Override
    public void toData(DataOutput out,
        SerializationContext context) throws IOException {
      super.toData(out, context);
      DataSerializer.writeString(regionPath, out);
      out.writeBoolean(lostVersionSources[0] instanceof DiskStoreID);
      out.writeInt(lostVersionSources.length);
      for (VersionSource id : lostVersionSources) {
        id.writeEssentialData(out);
      }
    }
IDs that destroyed the region or crashed during GII that the GII recipient got events from
that weren't sent to this member
geode-core/src/main/java/org/apache/geode/internal/cache/InitialImageOperation.java