private com.google.protobuf.SingleFieldBuilderV3<
              com.google.cloud.tpu.v2alpha1.Reservation.Standard.Usage,
              com.google.cloud.tpu.v2alpha1.Reservation.Standard.Usage.Builder,
              com.google.cloud.tpu.v2alpha1.Reservation.Standard.UsageOrBuilder>
          getUsageFieldBuilder() {
        if (usageBuilder_ == null) {
          usageBuilder_ =
              new com.google.protobuf.SingleFieldBuilderV3<
                  com.google.cloud.tpu.v2alpha1.Reservation.Standard.Usage,
                  com.google.cloud.tpu.v2alpha1.Reservation.Standard.Usage.Builder,
                  com.google.cloud.tpu.v2alpha1.Reservation.Standard.UsageOrBuilder>(
                  getUsage(), getParentForChildren(), isClean());
          usage_ = null;
        }
        return usageBuilder_;
      }
<pre>
The current usage of the reservation.
</pre>

<code>.google.cloud.tpu.v2alpha1.Reservation.Standard.Usage usage = 5;</code>
java-tpu/proto-google-cloud-tpu-v2alpha1/src/main/java/com/google/cloud/tpu/v2alpha1/Reservation.java