public int getUnreachableCount() {
    return unreachable_.size();
  }
<pre>
Locations that could not be reached.
</pre>

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

@return The count of unreachable.
java-tpu/proto-google-cloud-tpu-v1/src/main/java/com/google/cloud/tpu/v1/ListAcceleratorTypesResponse.java