@java.lang.Override
  public Builder toBuilder() {
    return this == DEFAULT_INSTANCE ? new Builder() : new Builder().mergeFrom(this);
  }
<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