public com.google.protobuf.ByteString getHealthDescriptionBytes() {
      java.lang.Object ref = healthDescription_;
      if (ref instanceof String) {
        com.google.protobuf.ByteString b =
            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
        healthDescription_ = b;
        return b;
      } else {
        return (com.google.protobuf.ByteString) ref;
      }
    }
<pre>
Output only. If this field is populated, it contains a description of why
the TPU Node is unhealthy.
</pre>

<code>string health_description = 10 [(.google.api.field_behavior) = OUTPUT_ONLY];</code>

@return The bytes for healthDescription.
java-tpu/proto-google-cloud-tpu-v1/src/main/java/com/google/cloud/tpu/v1/Node.java