@java.lang.Override
    public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
      if (size_ != 0) {
        output.writeInt32(1, size_);
      }
      if (capacityUnits_
          != com.google.cloud.tpu.v2alpha1.Reservation.Standard.CapacityUnits
              .CAPACITY_UNITS_UNSPECIFIED
              .getNumber()) {
        output.writeEnum(2, capacityUnits_);
      }
      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(resourceType_)) {
        com.google.protobuf.GeneratedMessageV3.writeString(output, 3, resourceType_);
      }
      if (((bitField0_ & 0x00000001) != 0)) {
        output.writeMessage(4, getInterval());
      }
      if (((bitField0_ & 0x00000002) != 0)) {
        output.writeMessage(5, getUsage());
      }
      getUnknownFields().writeTo(output);
    }
<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