public Builder clearSpot() {
      if (spotBuilder_ == null) {
        if (tierCase_ == 3) {
          tierCase_ = 0;
          tier_ = null;
          onChanged();
        }
      } else {
        if (tierCase_ == 3) {
          tierCase_ = 0;
          tier_ = null;
        }
        spotBuilder_.clear();
      }
      return this;
    }
<pre>
Optional. The Spot tier.
</pre>

<code>
.google.cloud.tpu.v2.QueuedResource.Spot spot = 3 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-tpu/proto-google-cloud-tpu-v2/src/main/java/com/google/cloud/tpu/v2/QueuedResource.java