@java.lang.Override
  public int getSerializedSize() {
    int size = memoizedSize;
    if (size != -1) return size;

    size = 0;
    for (int i = 0; i < instances_.size(); i++) {
      size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, instances_.get(i));
    }
    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
      size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
    }
    {
      int dataSize = 0;
      for (int i = 0; i < unreachable_.size(); i++) {
        dataSize += computeStringSizeNoTag(unreachable_.getRaw(i));
      }
      size += dataSize;
      size += 1 * getUnreachableList().size();
    }
    size += getUnknownFields().getSerializedSize();
    memoizedSize = size;
    return size;
  }
<pre>
Locations that could not be reached.
</pre>

<code>repeated string unreachable = 3;</code>

@param index The index of the value to return.
@return The bytes of the unreachable at the given index.
java-valkey/proto-google-cloud-valkey-v1/src/main/java/com/google/cloud/memorystore/v1/ListInstancesResponse.java