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

    size = 0;
    if (startingOffsetCase_ == 1) {
      size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, startingOffset_);
    }
    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(fallbackStartingOffset_)) {
      size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, fallbackStartingOffset_);
    }
    size += getUnknownFields().getSerializedSize();
    memoizedSize = size;
    return size;
  }
<pre>
This is the logical starting point to fallback upon should the
specified starting offset be unavailable.

This can be one of the following values:

"begin": This will read from the earliest available message.

"end": This will read only future messages.
</pre>

<code>string fallback_starting_offset = 2;</code>

@return The bytes for fallbackStartingOffset.
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/ControlledMode.java